feat: adds Referer, Host, RequestURI and User-Agent on request

TinyGo compatible packages

.all-contributorsrc

@@ -0,0 +1,37 @@
+{
+  "projectName": "go-wasm-http-server",
+  "projectOwner": "nlepage",
+  "repoType": "github",
+  "repoHost": "https://github.com",
+  "files": [
+    "README.md"
+  ],
+  "imageSize": 100,
+  "commit": false,
+  "commitConvention": "gitmoji",
+  "contributors": [
+    {
+      "login": "jphastings",
+      "name": "JP Hastings-Edrei",
+      "avatar_url": "https://avatars.githubusercontent.com/u/42999?v=4",
+      "profile": "https://byjp.me/",
+      "contributions": [
+        "code",
+        "doc",
+        "example"
+      ]
+    },
+    {
+      "login": "EliCDavis",
+      "name": "Eli Davis",
+      "avatar_url": "https://avatars.githubusercontent.com/u/9094977?v=4",
+      "profile": "https://recolude.com/",
+      "contributions": [
+        "code",
+        "bug"
+      ]
+    }
+  ],
+  "contributorsPerLine": 7,
+  "linkToUsage": false
+}

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: [nlepage]

.prettierrc

@@ -0,0 +1,5 @@
+{
+  "printWidth": 120,
+  "singleQuote": true,
+  "trailingComma": "all"
+}

.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+  "go.toolsEnvVars": {
+    "GOOS": "js",
+    "GOARCH": "wasm"
+  }
+}

LICENSE

@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2021 Nicolas Lepage
+   Copyright 2025 Nicolas Lepage
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

README.md

@@ -6,38 +6,224 @@
   <a href="https://github.com/nlepage/go-wasm-http-server/blob/master/LICENSE" target="_blank">
     <img alt="License: Apache 2.0" src="https://img.shields.io/badge/License-Apache--2.0-yellow.svg" />
   </a>
-  <a href="https://twitter.com/njblepage" target="_blank">
-    <img alt="Twitter: njblepage" src="https://img.shields.io/twitter/follow/njblepage.svg?style=social" />
-  </a>
 </p>
 
-> Build your Go HTTP Server to [WebAssembly](https://mdn.io/WebAssembly/) and embed it in a ServiceWorker!
+> Embed your Go HTTP handlers in a ServiceWorker (using [WebAssembly](https://mdn.io/WebAssembly/)) and emulate an HTTP server!
 
-✨ [Demos](https://nlepage.github.io/go-wasm-http-server/)
+## Examples
 
-## Install
+ - [Hello example](https://nlepage.github.io/go-wasm-http-server/hello) ([sources](https://github.com/nlepage/go-wasm-http-server/tree/master/docs/hello))
-
+ - [Hello example with state](https://nlepage.github.io/go-wasm-http-server/hello-state) ([sources](https://github.com/nlepage/go-wasm-http-server/tree/master/docs/hello-state))
-TODO
+ - [Hello example with state and keepalive](https://nlepage.github.io/go-wasm-http-server/hello-state-keepalive) ([sources](https://github.com/nlepage/go-wasm-http-server/tree/master/docs/hello-state-keepalive))
-
+ - [Hello example with Server Sent Events](https://nlepage.github.io/go-wasm-http-server/hello-sse/) ([sources](https://nlepage.github.io/go-wasm-http-server/hello-sse/))
-## Usage
+ - [😺 Catption generator example](https://nlepage.github.io/catption/wasm) ([sources](https://github.com/nlepage/catption/tree/wasm))
-
+ - [Random password generator web server](https://nlepage.github.io/random-password-please/) ([sources](https://github.com/nlepage/random-password-please) forked from [jbarham/random-password-please](https://github.com/jbarham/random-password-please))
-TODO
+ - [Server fallbacks, and compiling with TinyGo](https://nlepage.github.io/go-wasm-http-server/tinygo/) (runs locally; see [sources & readme](https://github.com/nlepage/go-wasm-http-server/tree/master/docs/tinygo#readme) for how to run this example)
-
-## Why?
-
-TODO
 
 ## How?
 
-TODO
+Below is a talk given at the Go devroom of FOSDEM 2021 explaining how `go-wasm-http-server` works.
 
-## Author
+> [!WARNING]  
+> `go-wasm-http-server` has suffered major changes since this talk, be aware that it is not accurate anymore on several aspects.
+> Please refer to the documentation below for up to date usage of `go-wasm-http-server`.
 
-👤 **Nicolas Lepage**
+[![Deploy a Go HTTP server in your browser Youtube link](https://raw.githubusercontent.com/nlepage/go-wasm-http-talk/main/youtube.png)](https://youtu.be/O2RB_8ircdE)
 
-* Website: https://nicolas.lepage.dev/
+The slides are available [here](https://nlepage.github.io/go-wasm-http-talk/).
-* Twitter: [@njblepage](https://twitter.com/njblepage)
+
-* Github: [@nlepage](https://github.com/nlepage)
+## Why?
+
+`go-wasm-http-server` can help you put up a demonstration for a project without actually running a Go HTTP server.
+
+## Requirements
+
+`go-wasm-http-server` requires you to build your Go application to WebAssembly, so you need to make sure your code is compatible:
+- no C bindings
+- no System dependencies such as file system or network (database server for example)
+- For smaller WASM blobs, your code may also benefit from being compatible with, and compiled by, [TinyGo](https://tinygo.org/docs/reference/lang-support/stdlib/). See the TinyGo specific details below.
+
+## Usage
+
+### Step 1: Build to `js/wasm`
+
+In your Go code, replace [`http.ListenAndServe()`](https://pkg.go.dev/net/http#ListenAndServe) (or [`net.Listen()`](https://pkg.go.dev/net#Listen) + [`http.Serve()`](https://pkg.go.dev/net/http#Serve)) by [wasmhttp.Serve()](https://pkg.go.dev/github.com/nlepage/go-wasm-http-server#Serve):
+
+📄 `server.go`
+```go
+//go:build !js && !wasm
+
+package main
+
+import (
+    "net/http"
+)
+
+func main() {
+    // Define handlers...
+
+    http.ListenAndServe(":8080", nil)
+}
+```
+
+becomes:
+
+📄 `server_js_wasm.go`
+```go
+//go:build js && wasm
+
+package main
+
+import (
+    wasmhttp "github.com/nlepage/go-wasm-http-server/v2"
+)
+
+func main() {
+    // Define handlers...
+
+    wasmhttp.Serve(nil)
+}
+```
+
+You may want to use build tags as shown above (or file name suffixes) in order to be able to build both to WebAssembly and other targets.
+
+Then build your WebAssembly binary:
+
+```sh
+# To compile with Go
+GOOS=js GOARCH=wasm go build -o server.wasm .
+
+# To compile with TinyGo, if your code is compatible
+GOOS=js GOARCH=wasm tinygo build -o server.wasm  .
+```
+
+### Step 2: Create ServiceWorker file
+
+First, check the version of Go/TinyGo you compiled your wasm with:
+
+```sh
+$ go version
+go version go1.23.4 darwin/arm64
+#          ^------^
+
+$ tinygo version
+tinygo version 0.35.0 darwin/arm64 (using go version go1.23.4 and LLVM version 18.1.2)
+#              ^----^
+```
+
+Create a ServiceWorker file with the following code:
+
+📄 `sw.js`
+```js
+// Note the 'go.1.23.4' below, that matches the version you just found:
+importScripts('https://cdn.jsdelivr.net/gh/golang/go@go1.23.4/misc/wasm/wasm_exec.js')
+// If you compiled with TinyGo then, similarly, use:
+importScripts('https://cdn.jsdelivr.net/gh/tinygo-org/tinygo@0.35.0/targets/wasm_exec.js')
+
+importScripts('https://cdn.jsdelivr.net/gh/nlepage/go-wasm-http-server@v2.2.1/sw.js')
+
+registerWasmHTTPListener('path/to/server.wasm')
+```
+
+By default the server will deploy at the ServiceWorker's scope root, check [`registerWasmHTTPListener()`'s API](https://github.com/nlepage/go-wasm-http-server#registerwasmhttplistenerwasmurl-options) for more information.
+
+You may want to add these additional event listeners in your ServiceWorker:
+
+```js
+// Skip installed stage and jump to activating stage
+addEventListener('install', (event) => {
+  event.waitUntil(skipWaiting())
+})
+
+// Start controlling clients as soon as the SW is activated
+addEventListener('activate', event => {
+  event.waitUntil(clients.claim())
+})
+```
+
+### Step 3: Register the ServiceWorker
+
+In your web page(s), register the ServiceWorker:
+
+```html
+<script>
+  // By default the ServiceWorker's scope will be "server/"
+  navigator.serviceWorker.register('server/sw.js')
+</script>
+```
+
+Now your web page(s) may start fetching from the server:
+
+```js
+// The server will receive a request for "/path/to/resource"
+fetch('server/path/to/resource').then(res => {
+  // use response...
+})
+```
+
+## API
+
+For Go API see [pkg.go.dev/github.com/nlepage/go-wasm-http-server](https://pkg.go.dev/github.com/nlepage/go-wasm-http-server#section-documentation)
+
+### JavaScript API
+
+### `registerWasmHTTPListener(wasmUrl, options)`
+
+Instantiates and runs the WebAssembly module at `wasmUrl`, and registers a fetch listener forwarding requests to the WebAssembly module's server.
+
+⚠ This function must be called only once in a ServiceWorker, if you want to register several servers you must use several ServiceWorkers.
+
+The server will be "deployed" at the root of the ServiceWorker's scope by default, `base` may be used to deploy the server at a subpath of the scope.
+
+See [ServiceWorkerContainer.register()](https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerContainer/register) for more information about the scope of a ServiceWorker.
+
+#### `wasmUrl`
+
+URL string of the WebAssembly module, example: `"path/to/my-module.wasm"`.
+
+#### `options`
+
+An optional object containing:
+
+- `base` (`string`): Base path of the server, relative to the ServiceWorker's scope.
+- `cacheName` (`string`): Name of the [Cache](https://developer.mozilla.org/en-US/docs/Web/API/Cache) to store the WebAssembly binary.
+- `args` (`string[]`): Arguments for the WebAssembly module.
+- `passthrough` (`(request: Request): boolean`): Optional callback to allow passing the request through to network.
+
+## <abbr title="Frequently Asked Questions">FAQ</abbr> ❓
+
+### Are WebSockets supported?
+
+No, WebSockets aren’t and won’t be supported, because Service Workers cannot intercept websocket connections.
+
+However [Server Sent Events](https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events), which is an alternative to WebSockets, are supported, you can find the code for an example [here](https://github.com/nlepage/go-wasm-http-server/tree/master/docs/hello-sse) and the demo [here](https://nlepage.github.io/go-wasm-http-server/hello-sse/).
+
+### Is it compatible with TinyGo?
+
+Yes, an example and some specific information is available [here](https://github.com/nlepage/go-wasm-http-server/tree/master/docs/tinygo).
+
+## Contributors ✨
+
+Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):
+
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-disable -->
+<table>
+  <tbody>
+    <tr>
+      <td align="center" valign="top" width="14.28%"><a href="https://byjp.me/"><img src="https://avatars.githubusercontent.com/u/42999?v=4?s=100" width="100px;" alt="JP Hastings-Edrei"/><br /><sub><b>JP Hastings-Edrei</b></sub></a><br /><a href="https://github.com/nlepage/go-wasm-http-server/commits?author=jphastings" title="Code">💻</a> <a href="https://github.com/nlepage/go-wasm-http-server/commits?author=jphastings" title="Documentation">📖</a> <a href="#example-jphastings" title="Examples">💡</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://recolude.com/"><img src="https://avatars.githubusercontent.com/u/9094977?v=4?s=100" width="100px;" alt="Eli Davis"/><br /><sub><b>Eli Davis</b></sub></a><br /><a href="https://github.com/nlepage/go-wasm-http-server/commits?author=EliCDavis" title="Code">💻</a> <a href="https://github.com/nlepage/go-wasm-http-server/issues?q=author%3AEliCDavis" title="Bug reports">🐛</a></td>
+    </tr>
+  </tbody>
+</table>
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+
+<!-- ALL-CONTRIBUTORS-LIST:END -->
+
+This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!
 
 ## 🤝 Contributing
 
@@ -49,8 +235,8 @@ Give a ⭐️ if this project helped you!
 
 ## 📝 License
 
-Copyright © 2021 [Nicolas Lepage](https://github.com/nlepage).<br />
+Copyright © 2025 [Nicolas Lepage](https://github.com/nlepage).<br />
 This project is [Apache 2.0](https://github.com/nlepage/go-wasm-http-server/blob/master/LICENSE) licensed.
 
 ***
-_This README was generated with ❤️ by [readme-md-generator](https://github.com/kefranabg/readme-md-generator)_
+_This README was generated with ❤️ by [readme-md-generator](https://github.com/kefranabg/readme-md-generator)_

docs/hello-multiple/api.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"os"
+
+	wasmhttp "github.com/nlepage/go-wasm-http-server/v2"
+)
+
+var binaryName = ""
+
+func main() {
+	http.HandleFunc("/hello", func(res http.ResponseWriter, req *http.Request) {
+		res.Header().Add("Content-Type", "application/json")
+		if err := json.NewEncoder(res).Encode(map[string]string{
+			"message": fmt.Sprintf("Hello from %s at path %s", binaryName, os.Getenv("WASM_HTTP_PATH")),
+		}); err != nil {
+			panic(err)
+		}
+	})
+
+	wasmhttp.Serve(nil)
+
+	select {}
+}

docs/hello-multiple/build.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+GOOS=js GOARCH=wasm go build -o api1.wasm --ldflags="-X 'main.binaryName=api1.wasm'" .
+GOOS=js GOARCH=wasm go build -o api2.wasm --ldflags="-X 'main.binaryName=api2.wasm'" .

docs/hello-multiple/index.html

@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>go-wasm-http-server hello demo</title>
+    <script>
+      navigator.serviceWorker.register('sw.js');
+
+      async function hello() {
+        const api = document.querySelector('#api').value;
+
+        const res = await fetch(`${api}/hello`);
+
+        const { message } = await res.json();
+
+        alert(message);
+      }
+    </script>
+  </head>
+  <body>
+    <label for="api">API: </label
+    ><select id="api">
+      <option value="api1/1">api1.wasm first instance</option>
+      <option value="api1/2">api1.wasm second instance</option>
+      <option value="api2/1">api2.wasm first instance</option>
+      <option value="api2/2">api2.wasm second instance</option>
+    </select>
+    <button onclick="hello()">Hello</button>
+  </body>
+</html>

docs/hello-multiple/sw.js

@@ -0,0 +1,15 @@
+importScripts('https://cdn.jsdelivr.net/gh/golang/go@go1.25.1/lib/wasm/wasm_exec.js');
+importScripts('https://cdn.jsdelivr.net/gh/nlepage/go-wasm-http-server@master/sw.js');
+
+addEventListener('install', (event) => {
+  event.waitUntil(caches.open('examples').then((cache) => cache.addAll(['api1.wasm', 'api2.wasm'])));
+});
+
+addEventListener('activate', (event) => {
+  event.waitUntil(clients.claim());
+});
+
+registerWasmHTTPListener('api1.wasm', { base: 'api1/1/' });
+registerWasmHTTPListener('api1.wasm', { base: 'api1/2/' });
+registerWasmHTTPListener('api2.wasm', { base: 'api2/1/' });
+registerWasmHTTPListener('api2.wasm', { base: 'api2/2/' });

docs/hello-sse/api.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/tmaxmax/go-sse"
+
+	wasmhttp "github.com/nlepage/go-wasm-http-server/v2"
+)
+
+func main() {
+	s := &sse.Server{}
+	t, _ := sse.NewType("ping")
+
+	go func() {
+		m := &sse.Message{
+			Type: t,
+		}
+		m.AppendData("Hello world")
+
+		for range time.Tick(time.Second) {
+			_ = s.Publish(m)
+		}
+	}()
+
+	http.Handle("/events", s)
+
+	if _, err := wasmhttp.Serve(nil); err != nil {
+		panic(err)
+	}
+
+	select {}
+}

docs/hello-sse/index.html

@@ -0,0 +1,56 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>go-wasm-http-server hello sse demo</title>
+    <script>
+      navigator.serviceWorker.register('sw.js').then((registration) => {
+        const serviceWorker = registration.installing ?? registration.waiting ?? registration.active;
+        if (serviceWorker.state === 'activated') {
+          document.querySelector('#open-button').disabled = false;
+        } else {
+          serviceWorker.addEventListener('statechange', (e) => {
+            if (e.target.state === 'activated') {
+              document.querySelector('#open-button').disabled = false;
+            }
+          });
+        }
+      });
+
+      window.addEventListener('DOMContentLoaded', () => {
+        let es;
+
+        document.querySelector('#open-button').addEventListener('click', () => {
+          if (es && es.readyState === es.OPEN) return;
+          es = new EventSource('api/events');
+          es.addEventListener('ping', (e) => {
+            const li = document.createElement('li');
+            li.textContent = `ping: data=${e.data}`;
+            document.querySelector('ul').append(li);
+          });
+        });
+
+        document.querySelector('#close-button').addEventListener('click', () => {
+          if (!es) return;
+          es.close();
+        });
+
+        document.querySelector('#clear-button').addEventListener('click', () => {
+          document.querySelector('ul').innerHTML = '';
+        });
+
+        window.addEventListener('unload', () => {
+          if (!es) return;
+          es.close();
+        });
+      });
+    </script>
+  </head>
+  <body>
+    <p>
+      <button id="open-button" disabled>Open event source</button>
+      <button id="close-button">Close event source</button>
+      <button id="clear-button">Clear events</button>
+    </p>
+    <ul></ul>
+  </body>
+</html>

docs/hello-sse/sw.js

@@ -0,0 +1,14 @@
+importScripts('https://cdn.jsdelivr.net/gh/golang/go@go1.25.1/lib/wasm/wasm_exec.js');
+importScripts('https://cdn.jsdelivr.net/gh/nlepage/go-wasm-http-server@master/sw.js');
+
+const wasm = 'api.wasm';
+
+addEventListener('install', (event) => {
+  event.waitUntil(caches.open('examples').then((cache) => cache.add(wasm)));
+});
+
+addEventListener('activate', (event) => {
+  event.waitUntil(clients.claim());
+});
+
+registerWasmHTTPListener(wasm, { base: 'api' });

docs/hello-state-keepalive/index.html

@@ -1,32 +1,32 @@
 <!DOCTYPE html>
 <html>
   <head>
-    <title>go-wasm-http-server hello with state demo</title>
+    <title>go-wasm-http-server hello with state and keepalive demo</title>
     <script>
-      navigator.serviceWorker.register('sw.js').then(registration => {
+      navigator.serviceWorker.register('sw.js').then((registration) => {
-        const sw = registration.active ?? registration.installing ?? registration.waiting
+        const sw = registration.active ?? registration.installing ?? registration.waiting;
-        setInterval(() => sw.postMessage(null), 15000)
+        setInterval(() => sw.postMessage(null), 15000);
-      })
+      });
 
       async function hello() {
-        const name = document.querySelector("#name").value
+        const name = document.querySelector('#name').value;
 
         const res = await fetch('api/hello', {
           method: 'POST',
           headers: {
-            'Content-Type': 'application/json'
+            'Content-Type': 'application/json',
           },
-          body: JSON.stringify({ name })
+          body: JSON.stringify({ name }),
-        })
+        });
 
-        const { message } = await res.json()
+        const { message } = await res.json();
 
-        alert(message)
+        alert(message);
       }
     </script>
   </head>
   <body>
-    <label for="name">Name: </label><input id="name" value="World">
+    <label for="name">Name: </label><input id="name" value="World" />
     <button onclick="hello()">Hello</button>
   </body>
 </html>

docs/hello-state-keepalive/sw.js

@@ -1,13 +1,16 @@
-importScripts('https://cdn.jsdelivr.net/gh/nlepage/go-wasm-http-server@078ff3547ebe2abfbee1fd5af9ca5ad64be480c0/sw.js')
+importScripts('https://cdn.jsdelivr.net/gh/golang/go@go1.25.1/lib/wasm/wasm_exec.js');
+importScripts('https://cdn.jsdelivr.net/gh/nlepage/go-wasm-http-server@master/sw.js');
 
-addEventListener('install', event => {
+const wasm = '../hello-state/api.wasm';
-  event.waitUntil(skipWaiting())
-})
-  
-addEventListener('activate', event => {
-  event.waitUntil(clients.claim())
-})
 
-addEventListener('message', () => {})
+addEventListener('install', (event) => {
+  event.waitUntil(caches.open('examples').then((cache) => cache.add(wasm)));
+});
 
-registerWasmHTTPListener('../hello-state/api.wasm', { base: 'api' })
+addEventListener('activate', (event) => {
+  event.waitUntil(clients.claim());
+});
+
+addEventListener('message', () => {});
+
+registerWasmHTTPListener(wasm, { base: 'api' });

docs/hello-state/api.go

@@ -6,7 +6,7 @@ import (
 	"net/http"
 	"sync/atomic"
 
-	wasmhttp "github.com/nlepage/go-wasm-http-server"
+	wasmhttp "github.com/nlepage/go-wasm-http-server/v2"
 )
 
 func main() {

docs/hello-state/index.html

@@ -3,27 +3,27 @@
   <head>
     <title>go-wasm-http-server hello with state demo</title>
     <script>
-      navigator.serviceWorker.register('sw.js')
+      navigator.serviceWorker.register('sw.js');
 
       async function hello() {
-        const name = document.querySelector("#name").value
+        const name = document.querySelector('#name').value;
 
         const res = await fetch('api/hello', {
           method: 'POST',
           headers: {
-            'Content-Type': 'application/json'
+            'Content-Type': 'application/json',
           },
-          body: JSON.stringify({ name })
+          body: JSON.stringify({ name }),
-        })
+        });
 
-        const { message } = await res.json()
+        const { message } = await res.json();
 
-        alert(message)
+        alert(message);
       }
     </script>
   </head>
   <body>
-    <label for="name">Name: </label><input id="name" value="World">
+    <label for="name">Name: </label><input id="name" value="World" />
     <button onclick="hello()">Hello</button>
   </body>
 </html>

docs/hello-state/sw.js

@@ -1,11 +1,14 @@
-importScripts('https://cdn.jsdelivr.net/gh/nlepage/go-wasm-http-server@078ff3547ebe2abfbee1fd5af9ca5ad64be480c0/sw.js')
+importScripts('https://cdn.jsdelivr.net/gh/golang/go@go1.25.1/lib/wasm/wasm_exec.js');
+importScripts('https://cdn.jsdelivr.net/gh/nlepage/go-wasm-http-server@master/sw.js');
+
+const wasm = 'api.wasm';
 
 addEventListener('install', (event) => {
-  event.waitUntil(skipWaiting())
+  event.waitUntil(caches.open('examples').then((cache) => cache.add(wasm)));
-})
+});
-  
-addEventListener('activate', event => {
-  event.waitUntil(clients.claim())
-})
 
-registerWasmHTTPListener('api.wasm', { base: 'api' })
+addEventListener('activate', (event) => {
+  event.waitUntil(clients.claim());
+});
+
+registerWasmHTTPListener(wasm, { base: 'api' });

docs/hello/api.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"net/http"
 
-	wasmhttp "github.com/nlepage/go-wasm-http-server"
+	wasmhttp "github.com/nlepage/go-wasm-http-server/v2"
 )
 
 func main() {

docs/hello/index.html

@@ -3,27 +3,27 @@
   <head>
     <title>go-wasm-http-server hello demo</title>
     <script>
-      navigator.serviceWorker.register('sw.js')
+      navigator.serviceWorker.register('sw.js');
 
       async function hello() {
-        const name = document.querySelector("#name").value
+        const name = document.querySelector('#name').value;
 
         const res = await fetch('api/hello', {
           method: 'POST',
           headers: {
-            'Content-Type': 'application/json'
+            'Content-Type': 'application/json',
           },
-          body: JSON.stringify({ name })
+          body: JSON.stringify({ name }),
-        })
+        });
 
-        const { message } = await res.json()
+        const { message } = await res.json();
 
-        alert(message)
+        alert(message);
       }
     </script>
   </head>
   <body>
-    <label for="name">Name: </label><input id="name" value="World">
+    <label for="name">Name: </label><input id="name" value="World" />
     <button onclick="hello()">Hello</button>
   </body>
 </html>

docs/hello/sw.js

@@ -1,11 +1,14 @@
-importScripts('https://cdn.jsdelivr.net/gh/nlepage/go-wasm-http-server@078ff3547ebe2abfbee1fd5af9ca5ad64be480c0/sw.js')
+importScripts('https://cdn.jsdelivr.net/gh/golang/go@go1.25.1/lib/wasm/wasm_exec.js');
+importScripts('https://cdn.jsdelivr.net/gh/nlepage/go-wasm-http-server@master/sw.js');
+
+const wasm = 'api.wasm';
 
 addEventListener('install', (event) => {
-  event.waitUntil(skipWaiting())
+  event.waitUntil(caches.open('examples').then((cache) => cache.add(wasm)));
-})
+});
-  
-addEventListener('activate', event => {
-  event.waitUntil(clients.claim())
-})
 
-registerWasmHTTPListener('api.wasm', { base: 'api' })
+addEventListener('activate', (event) => {
+  event.waitUntil(clients.claim());
+});
+
+registerWasmHTTPListener(wasm, { base: 'api' });

docs/index.html

@@ -1,14 +1,45 @@
 <!DOCTYPE html>
-<html>
+<html lang="en">
   <head>
-    <title>go-wasm-http-server demo</title>
+    <title>go-wasm-http-server examples</title>
   </head>
   <body>
+    <h1>go-wasm-http-server examples</h1>
     <ul>
-        <li><a href="hello">Hello demo</a> (<a href="https://github.com/nlepage/go-wasm-http-server/tree/master/docs/hello">sources</a>)</li>
+      <li>
-        <li><a href="hello-state">Hello with state demo</a> (<a href="https://github.com/nlepage/go-wasm-http-server/tree/master/docs/hello-state">sources</a>)</li>
+        <a href="hello/">Hello example</a> (<a
-        <li><a href="hello-state-keepalive">Hello with state and keepalive demo</a> (<a href="https://github.com/nlepage/go-wasm-http-server/tree/master/docs/hello-state-keepalive">sources</a>)</li>
+          href="https://github.com/nlepage/go-wasm-http-server/tree/master/docs/hello"
-        <li><a href="https://nlepage.github.io/catption/wasm/">😺 Catption generator demo</a> (<a href="https://github.com/nlepage/catption/tree/wasm">sources</a>)</li>
+          >Sources</a
+        >)
+      </li>
+      <li>
+        <a href="hello-multiple/">Hello example with multiple wasm instances</a> (<a
+          href="https://github.com/nlepage/go-wasm-http-server/tree/master/docs/hello-multiple"
+          >Sources</a
+        >)
+      </li>
+      <li>
+        <a href="hello-state/">Hello example with state</a> (<a
+          href="https://github.com/nlepage/go-wasm-http-server/tree/master/docs/hello-state"
+          >Sources</a
+        >)
+      </li>
+      <li>
+        <a href="hello-state-keepalive/">Hello example with state and keepalive</a> (<a
+          href="https://github.com/nlepage/go-wasm-http-server/tree/master/docs/hello-state-keepalive"
+          >Sources</a
+        >)
+      </li>
+      <li>
+        <a href="hello-sse/">Hello example with Server Sent Events</a> (<a
+          href="https://github.com/nlepage/go-wasm-http-server/tree/master/docs/hello-sse"
+          >Sources</a
+        >)
+      </li>
     </ul>
+    <p>
+      See <a href="https://github.com/nlepage/go-wasm-http-server?tab=readme-ov-file#readme">README</a> for more
+      information.
+    </p>
   </body>
 </html>

docs/tinygo/README.md

@@ -0,0 +1,42 @@
+# Compiling with TinyGo
+
+This example demonstrates that go-wasm-http-server can also be compiled with [TinyGo](https://www.tinygo.org), producing significantly smaller WASM blobs, though at the expense of [at least one known bug](https://github.com/tinygo-org/tinygo/issues/1140) and a [reduced standard library](https://tinygo.org/docs/reference/lang-support/stdlib/).
+
+This example also demonstrates how the same code can be used for both server-side execution, and client-side execution in WASM (providing support for clients that cannot interpret WASM).
+
+## Prerequisites
+
+You'll need a version of [TinyGo installed](https://tinygo.org/getting-started/install/).  (eg. `brew install tinygo-org/tools/tinygo`)
+
+You'll need to make sure the first line of `sw.js` here has the same tinygo version number as your TinyGo version (this was v0.35.0 at time of writing).
+
+## Build & run
+
+Compile the WASM blob with TinyGo (this has been done for you for this example):
+
+```bash
+GOOS=js GOARCH=wasm tinygo build -o api.wasm  .
+```
+
+Run the server (with Go, not TinyGo):
+
+```bash
+$ go run .
+Server starting on http://127.0.0.1:<port>
+```
+
+## Important notes
+
+You **must** use the TinyGo `wasm_exec.js`, specific to the version of TinyGo used to compile the WASM, in your `sw.js`. For example, if using the JSDelivr CDN:
+
+```js
+importScripts('https://cdn.jsdelivr.net/gh/tinygo-org/tinygo@0.35.0/targets/wasm_exec.js')
+```
+
+Note that the `0.35.0` within the path matches the TinyGo version used:
+
+```sh
+$ tinygo version
+tinygo version 0.35.0 darwin/arm64 (using go version go1.23.4 and LLVM version 18.1.2)
+#              ^----^
+```

docs/tinygo/handlers.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"encoding/json"
+	"net/http"
+	"runtime"
+)
+
+func goRuntimeHandler(res http.ResponseWriter, req *http.Request) {
+	res.Header().Add("Content-Type", "application/json")
+	if err := json.NewEncoder(res).Encode(map[string]string{
+		"os":       runtime.GOOS,
+		"arch":     runtime.GOARCH,
+		"compiler": runtime.Compiler,
+		"version":  runtime.Version(),
+	}); err != nil {
+		panic(err)
+	}
+}

docs/tinygo/index.html

@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>go-wasm-http-server tinygo demo</title>
+    <script>
+      const sw = navigator.serviceWorker
+
+      function attachServiceWorker() {
+        sw.register('sw.js')
+          .then(() => {
+            document.getElementById('wasm-status').innerText = "⚡️ Loaded - Will execute WASM locally"
+          })
+          .catch((err) => {
+            document.getElementById('wasm-status').innerText = "🛑 Error loading service worker — Check console"
+            console.error(err)
+          })
+      }
+
+      async function makeQuery() {
+        const res = await fetch('api/tiny', {
+          method: 'POST',
+          headers: {
+            'Content-Type': 'application/json'
+          }
+        })
+
+        document.getElementById('output').innerText = await res.text()
+      }
+    </script>
+  </head>
+  <body>
+    <p>This example demonstrates that go-wasm-http-server can be compiled with <a href="https://www.tinygo.org">TinyGo</em>, producing significantly smaller WASM blobs, at the expense of <a href="https://github.com/tinygo-org/tinygo/issues/1140">at least one known bug</a>, and a <a href="https://tinygo.org/docs/reference/lang-support/stdlib/">reduced standard library</a>.</p>
+    <dl><dt>WASM HTTP Service Worker:</dt><dd id="wasm-status">☁️ Not loaded — will call server</dd></dl>
+    
+    <ol>
+      <li><button onclick="makeQuery()">Call API</button></li>
+      <li><button onclick="attachServiceWorker()">Attach the service worker</button></li>
+      <li><span>Call the API again (Step 1)</span></li>
+    </ol>
+
+    <h3>Response:</h3>
+    <pre id="output"></pre>
+  </body>
+</html>

docs/tinygo/server.go

@@ -0,0 +1,34 @@
+//go:build !wasm
+// +build !wasm
+
+package main
+
+import (
+	"embed"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+)
+
+//go:embed *.html *.js *.wasm
+var thisDir embed.FS
+
+func main() {
+	// Serve all files in this directory statically
+	http.Handle("/", http.FileServer(http.FS(thisDir)))
+
+	// Note that this needs to be mounted at /api/tiny, rather than just /tiny (like in wasm.go)
+	// because the service worker mounts the WASM server at /api (at the end of sw.js)
+	http.HandleFunc("/api/tiny", goRuntimeHandler)
+
+	// Pick any available port. Note that ServiceWorkers _require_ localhost for non-SSL serving (so other LAN/WAN IPs will prevent the service worker from loading)
+	listener, err := net.Listen("tcp", ":0")
+	if err != nil {
+		log.Fatalf("Unable to claim a port to start server on: %v", err)
+	}
+
+	// Share the port being used & start
+	fmt.Printf("Server starting on http://127.0.0.1:%d\n", listener.Addr().(*net.TCPAddr).Port)
+	panic(http.Serve(listener, nil))
+}

docs/tinygo/sw.js

@@ -0,0 +1,14 @@
+importScripts('https://cdn.jsdelivr.net/gh/tinygo-org/tinygo@0.35.0/targets/wasm_exec.js')
+importScripts('https://cdn.jsdelivr.net/gh/nlepage/go-wasm-http-server@v2.2.1/sw.js')
+
+const wasm = 'api.wasm'
+
+addEventListener('install', (event) => {
+  event.waitUntil(caches.open('examples').then((cache) => cache.add(wasm)))
+})
+
+addEventListener('activate', (event) => {
+  event.waitUntil(clients.claim())
+})
+
+registerWasmHTTPListener(wasm, { base: 'api' })

docs/tinygo/wasm.go

@@ -0,0 +1,18 @@
+//go:build wasm
+// +build wasm
+
+package main
+
+import (
+	"net/http"
+
+	wasmhttp "github.com/nlepage/go-wasm-http-server/v2"
+)
+
+func main() {
+	http.HandleFunc("/tiny", goRuntimeHandler)
+
+	wasmhttp.Serve(nil)
+
+	select {}
+}

example_json_test.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"net/http"
 
-	wasmhttp "github.com/nlepage/go-wasm-http-server"
+	wasmhttp "github.com/nlepage/go-wasm-http-server/v2"
 )
 
 // Demonstrates a simple hello JSON service.
@@ -23,7 +23,11 @@ func Example_json() {
 		}
 	})
 
-	defer wasmhttp.Serve(nil)()
+	release, err := wasmhttp.Serve(nil)
+	if err != nil {
+		panic(err)
+	}
+	defer release()
 
 	// Wait for webpage event or use empty select{}
 }

go.mod

@@ -1,3 +1,9 @@
-module github.com/nlepage/go-wasm-http-server
+module github.com/nlepage/go-wasm-http-server/v2
 
-go 1.13
+go 1.22
+
+require (
+	github.com/hack-pad/safejs v0.1.1
+	github.com/nlepage/go-js-promise v1.1.0
+	github.com/tmaxmax/go-sse v0.11.0
+)

go.sum

@@ -0,0 +1,6 @@
+github.com/hack-pad/safejs v0.1.1 h1:d5qPO0iQ7h2oVtpzGnLExE+Wn9AtytxIfltcS2b9KD8=
+github.com/hack-pad/safejs v0.1.1/go.mod h1:HdS+bKF1NrE72VoXZeWzxFOVQVUSqZJAG0xNCnb+Tio=
+github.com/nlepage/go-js-promise v1.1.0 h1:BfvywsIMo4cpNOKyoReBWkxEW8f9HMwXqGc45wEKPRs=
+github.com/nlepage/go-js-promise v1.1.0/go.mod h1:bdOP0wObXu34euibyK39K1hoBCtlgTKXGc56AGflaRo=
+github.com/tmaxmax/go-sse v0.11.0 h1:nogmJM6rJUoOLoAwEKeQe5XlVpt9l7N82SS1jI7lWFg=
+github.com/tmaxmax/go-sse v0.11.0/go.mod h1:u/2kZQR1tyngo1lKaNCj1mJmhXGZWS1Zs5yiSOD+Eg8=

internal/jstype/types.go

@@ -0,0 +1,13 @@
+package jstype
+
+import (
+	"syscall/js"
+
+	"github.com/nlepage/go-wasm-http-server/v2/internal/safejs"
+)
+
+var (
+	ReadableStream = safejs.Safe(js.Global().Get("ReadableStream"))
+	Response       = safejs.Safe(js.Global().Get("Response"))
+	Uint8Array     = safejs.Safe(js.Global().Get("Uint8Array"))
+)

internal/readablestream/reader.go

@@ -0,0 +1,96 @@
+package readablestream
+
+import (
+	"io"
+
+	promise "github.com/nlepage/go-js-promise"
+
+	"github.com/nlepage/go-wasm-http-server/v2/internal/safejs"
+)
+
+type Reader struct {
+	value safejs.Value
+	buf   []byte
+	off   int
+}
+
+var _ io.ReadCloser = (*Reader)(nil)
+
+func NewReader(r safejs.Value) *Reader {
+	return &Reader{
+		value: r,
+	}
+}
+
+func (r *Reader) Read(p []byte) (int, error) {
+	if r.off < len(r.buf) {
+		n := copy(p, r.buf[r.off:])
+
+		r.off += n
+
+		return n, nil
+	}
+
+	r.off = 0
+
+	pRes, err := r.value.Call("read")
+	if err != nil {
+		return 0, err
+	}
+
+	ures, err := promise.Await(safejs.Unsafe(pRes))
+	if err != nil {
+		return 0, err
+	}
+
+	res := safejs.Safe(ures)
+
+	done, err := res.GetBool("done")
+	if err != nil {
+		return 0, err
+	}
+	if done {
+		return 0, io.EOF
+	}
+
+	value, err := res.Get("value")
+	if err != nil {
+		return 0, err
+	}
+
+	l, err := value.GetInt("length")
+	if err != nil {
+		return 0, err
+	}
+
+	if cap(r.buf) < l {
+		r.buf = make([]byte, l)
+	}
+	if len(r.buf) < cap(r.buf) {
+		r.buf = r.buf[:cap(r.buf)]
+	}
+
+	n, err := safejs.CopyBytesToGo(r.buf, value)
+	if err != nil {
+		return 0, err
+	}
+
+	r.buf = r.buf[:n]
+
+	n = copy(p, r.buf[r.off:])
+
+	r.off += n
+
+	return n, nil
+}
+
+func (r *Reader) Close() error {
+	p, err := r.value.Call("cancel")
+	if err != nil {
+		return err
+	}
+
+	_, err = promise.Await(safejs.Unsafe(p))
+
+	return err
+}

internal/readablestream/writer.go

@@ -0,0 +1,101 @@
+package readablestream
+
+import (
+	"context"
+	"io"
+
+	"github.com/nlepage/go-wasm-http-server/v2/internal/jstype"
+	"github.com/nlepage/go-wasm-http-server/v2/internal/safejs"
+)
+
+type Writer struct {
+	Value      safejs.Value
+	controller safejs.Value
+	ctx        context.Context
+	cancelled  bool
+}
+
+var _ io.WriteCloser = (*Writer)(nil)
+
+func NewWriter() (*Writer, error) {
+	var rs *Writer
+
+	var start safejs.Func
+	var controller safejs.Value
+
+	start, err := safejs.FuncOf(func(_ safejs.Value, args []safejs.Value) any {
+		defer start.Release()
+		controller = args[0]
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	var cancel safejs.Func
+	ctx, cancelCtx := context.WithCancel(context.Background())
+
+	cancel, err = safejs.FuncOf(func(_ safejs.Value, _ []safejs.Value) any {
+		defer cancel.Release()
+		rs.cancelled = true
+		cancelCtx()
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	source, err := safejs.ValueOf(map[string]any{
+		"start":  safejs.Unsafe(start.Value()),
+		"cancel": safejs.Unsafe(cancel.Value()),
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	value, err := jstype.ReadableStream.New(source)
+	if err != nil {
+		return nil, err
+	}
+
+	rs = &Writer{
+		Value:      value,
+		controller: controller,
+		ctx:        ctx,
+	}
+
+	return rs, nil
+}
+
+func (rs *Writer) Write(b []byte) (int, error) {
+	if rs.cancelled {
+		return 0, nil
+	}
+
+	chunk, err := jstype.Uint8Array.New(len(b)) // FIXME reuse same Uint8Array?
+	if err != nil {
+		return 0, err
+	}
+
+	n, err := safejs.CopyBytesToJS(chunk, b)
+	if err != nil {
+		return 0, err
+	}
+
+	_, err = rs.controller.Call("enqueue", chunk)
+
+	return n, err
+}
+
+func (rs *Writer) Close() error {
+	if rs.cancelled {
+		return nil
+	}
+
+	_, err := rs.controller.Call("close")
+	return err
+}
+
+func (rs *Writer) Context() context.Context {
+	return rs.ctx
+}

internal/safejs/bytes.go

@@ -0,0 +1,11 @@
+package safejs
+
+import "github.com/hack-pad/safejs"
+
+func CopyBytesToGo(dst []byte, src Value) (int, error) {
+	return safejs.CopyBytesToGo(dst, safejs.Value(src))
+}
+
+func CopyBytesToJS(dst Value, src []byte) (int, error) {
+	return safejs.CopyBytesToJS(safejs.Value(dst), src)
+}

internal/safejs/func.go

@@ -0,0 +1,26 @@
+package safejs
+
+import (
+	"github.com/hack-pad/safejs"
+)
+
+type Func safejs.Func
+
+func FuncOf(fn func(this Value, args []Value) any) (Func, error) {
+	r, err := safejs.FuncOf(func(this safejs.Value, args []safejs.Value) any {
+		args2 := make([]Value, len(args))
+		for i, v := range args {
+			args2[i] = Value(v)
+		}
+		return fn(Value(this), []Value(args2))
+	})
+	return Func(r), err
+}
+
+func (f Func) Release() {
+	safejs.Func(f).Release()
+}
+
+func (f Func) Value() Value {
+	return Value(safejs.Func(f).Value())
+}

internal/safejs/value.go

@@ -0,0 +1,111 @@
+package safejs
+
+import (
+	"syscall/js"
+
+	"github.com/hack-pad/safejs"
+)
+
+type Value safejs.Value
+
+func Safe(v js.Value) Value {
+	return Value(safejs.Safe(v))
+}
+
+func Unsafe(v Value) js.Value {
+	return safejs.Unsafe(safejs.Value(v))
+}
+
+func ValueOf(value any) (Value, error) {
+	v, err := safejs.ValueOf(value)
+	return Value(v), err
+}
+
+func (v Value) Call(m string, args ...any) (Value, error) {
+	args = toJSValue(args).([]any)
+	r, err := safejs.Value(v).Call(m, args...)
+	return Value(r), err
+}
+
+func (v Value) Get(p string) (Value, error) {
+	r, err := safejs.Value(v).Get(p)
+	return Value(r), err
+}
+
+func (v Value) GetBool(p string) (bool, error) {
+	bv, err := v.Get(p)
+	if err != nil {
+		return false, err
+	}
+
+	return safejs.Value(bv).Bool()
+}
+
+func (v Value) GetInt(p string) (int, error) {
+	iv, err := v.Get(p)
+	if err != nil {
+		return 0, err
+	}
+
+	return safejs.Value(iv).Int()
+}
+
+func (v Value) GetString(p string) (string, error) {
+	sv, err := v.Get(p)
+	if err != nil {
+		return "", err
+	}
+
+	return safejs.Value(sv).String()
+}
+
+func (v Value) Index(i int) (Value, error) {
+	r, err := safejs.Value(v).Index(i)
+	return Value(r), err
+}
+
+func (v Value) IndexString(i int) (string, error) {
+	sv, err := v.Index(i)
+	if err != nil {
+		return "", err
+	}
+
+	return safejs.Value(sv).String()
+}
+
+func (v Value) IsNull() bool {
+	return safejs.Value(v).IsNull()
+}
+
+func (v Value) IsUndefined() bool {
+	return safejs.Value(v).IsUndefined()
+}
+
+func (v Value) New(args ...any) (Value, error) {
+	args = toJSValue(args).([]any)
+	r, err := safejs.Value(v).New(args...)
+	return Value(r), err
+}
+
+func toJSValue(jsValue any) any {
+	switch value := jsValue.(type) {
+	case Value:
+		return safejs.Value(value)
+	case Func:
+		return safejs.Func(value)
+	case map[string]any:
+		newValue := make(map[string]any)
+		for mapKey, mapValue := range value {
+			newValue[mapKey] = toJSValue(mapValue)
+		}
+		return newValue
+	case []any:
+		newValue := make([]any, len(value))
+		for i, arg := range value {
+			newValue[i] = toJSValue(arg)
+		}
+		return newValue
+	default:
+		return jsValue
+	}
+}

package-lock.json

@@ -0,0 +1,787 @@
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+      },
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+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
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+      "dev": true,
+      "license": "MIT",
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+      "license": "MIT",
+      "engines": {
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+      "dev": true,
+      "license": "MIT",
+      "bin": {
+        "pegjs": "bin/pegjs"
+      },
+      "engines": {
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+      "dev": true,
+      "license": "MIT",
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+      "license": "MIT",
+      "optional": true,
+      "bin": {
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+      },
+      "engines": {
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+      "funding": {
+        "url": "https://github.com/prettier/prettier?sponsor=1"
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+      "license": "MIT"
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+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
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+      "license": "ISC"
+    },
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+      "resolved": "https://registry.npmjs.org/restore-cursor/-/restore-cursor-3.1.0.tgz",
+      "integrity": "sha512-l+sSefzHpj5qimhFSE5a8nufZYAM3sBSVMAPtYkmC+4EH2anSGaEMXSD0izRQbu9nfyQ9y5JrVmp7E8oZrUjvA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "onetime": "^5.1.0",
+        "signal-exit": "^3.0.2"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/run-async": {
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+      "resolved": "https://registry.npmjs.org/run-async/-/run-async-2.4.1.tgz",
+      "integrity": "sha512-tvVnVv01b8c1RrA6Ep7JkStj85Guv/YrMcwqYQnwjsAS2cTmmPGBBjAjpCW7RrSodNSoE2/qg9O4bceNvUuDgQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
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+      }
+    },
+    "node_modules/rxjs": {
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+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "tslib": "^1.9.0"
+      },
+      "engines": {
+        "npm": ">=2.0.0"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/set-blocking": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+      "integrity": "sha512-KiKBS8AnWGEyLzofFfmvKwpdPzqiy16LvQfK3yv/fVH7Bj13/wl3JSR1J+rfgRE9q7xUJK4qvgS8raSOeLUehw==",
+      "dev": true,
+      "license": "ISC"
+    },
+    "node_modules/signal-exit": {
+      "version": "3.0.7",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.7.tgz",
+      "integrity": "sha512-wnD2ZE+l+SPC/uoS0vXeE9L1+0wuaMqKlfz9AMUo38JsyLSBWSFcHR1Rri62LZc12vLr1gb3jl7iwQhgwpAbGQ==",
+      "dev": true,
+      "license": "ISC"
+    },
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+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
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+      }
+    },
+    "node_modules/supports-color": {
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha512-w89qg7PI8wAdvX60bMDP+bFoD5Dvhm9oLheFp5O4a2QF0cSBGsBX4qZmadPMvVqlLJBBci+WqGGOAPvcDeNSVg==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tmp": {
+      "version": "0.0.33",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
+      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "os-tmpdir": "~1.0.2"
+      },
+      "engines": {
+        "node": ">=0.6.0"
+      }
+    },
+    "node_modules/tr46": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
+      "integrity": "sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/tslib": {
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.14.1.tgz",
+      "integrity": "sha512-Xni35NKzjgMrwevysHTCArtLDpPvye8zV/0E4EyYn43P7/7qvQwPh9BGkHewbMulVntbigmcT7rdX3BNo9wRJg==",
+      "dev": true,
+      "license": "0BSD"
+    },
+    "node_modules/type-fest": {
+      "version": "0.21.3",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.21.3.tgz",
+      "integrity": "sha512-t0rzBq87m3fVcduHDUFhKmyyX+9eo6WQjZvf51Ea/M0Q7+T374Jp1aUiyUl0GKxp8M/OETVHSDvmkyPgvX+X2w==",
+      "dev": true,
+      "license": "(MIT OR CC0-1.0)",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+      "integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ==",
+      "dev": true,
+      "license": "BSD-2-Clause"
+    },
+    "node_modules/whatwg-url": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+      "integrity": "sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
+      }
+    },
+    "node_modules/which-module": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.1.tgz",
+      "integrity": "sha512-iBdZ57RDvnOR9AGBhML2vFZf7h8vmBjhoaZqODJBFWHVtKkDmKuHai3cx5PgVMrX5YDNp27AofYbAwctSS+vhQ==",
+      "dev": true,
+      "license": "ISC"
+    },
+    "node_modules/wrap-ansi": {
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
+      "integrity": "sha512-r6lPcBGxZXlIcymEu7InxDMhdW0KDxpLgoFLcguasxCaJ/SOIZwINatK9KY/tf+ZrlywOKU0UDj3ATXUBfxJXA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/y18n": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.3.tgz",
+      "integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ==",
+      "dev": true,
+      "license": "ISC"
+    },
+    "node_modules/yargs": {
+      "version": "15.4.1",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",
+      "integrity": "sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cliui": "^6.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^4.1.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^4.2.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^18.1.2"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "18.1.3",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-18.1.3.tgz",
+      "integrity": "sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    }
+  }
+}

package.go

@@ -1,4 +1,2 @@
-// Package wasmhttp (github.com/nlepage/go-wasm-http-server) allows to create a WebAssembly Go HTTP Server embedded in a ServiceWorker.
+// Package wasmhttp allows to create a WebAssembly Go HTTP Server embedded in a ServiceWorker.
-//
-// It is a subset of the full solution, a full usage is available on the github repository: https://github.com/nlepage/go-wasm-http-server
 package wasmhttp

package.json

@@ -5,5 +5,8 @@
   "main": "index.js",
   "repository": "https://github.com/nlepage/go-wasm-http-server",
   "author": "Nicolas Lepage <19571875+nlepage@users.noreply.github.com>",
-  "license": "Apache-2.0"
+  "license": "Apache-2.0",
+  "devDependencies": {
+    "all-contributors-cli": "^6.26.1"
+  }
 }

promise.go

@@ -1,55 +0,0 @@
-package wasmhttp
-
-import (
-	"syscall/js"
-)
-
-// NewPromise creates a new JavaScript Promise
-func NewPromise() (p js.Value, resolve func(interface{}), reject func(interface{})) {
-	var cbFunc js.Func
-	cbFunc = js.FuncOf(func(_ js.Value, args []js.Value) interface{} {
-		cbFunc.Release()
-
-		resolve = func(value interface{}) {
-			args[0].Invoke(value)
-		}
-
-		reject = func(value interface{}) {
-			args[1].Invoke(value)
-		}
-
-		return js.Undefined()
-	})
-
-	p = js.Global().Get("Promise").New(cbFunc)
-
-	return
-}
-
-// Await waits for the Promise to be resolved and returns the value
-func Await(p js.Value) (js.Value, error) {
-	resCh := make(chan js.Value)
-	var then js.Func
-	then = js.FuncOf(func(_ js.Value, args []js.Value) interface{} {
-		resCh <- args[0]
-		return nil
-	})
-	defer then.Release()
-
-	errCh := make(chan error)
-	var catch js.Func
-	catch = js.FuncOf(func(_ js.Value, args []js.Value) interface{} {
-		errCh <- js.Error{args[0]}
-		return nil
-	})
-	defer catch.Release()
-
-	p.Call("then", then).Call("catch", catch)
-
-	select {
-	case res := <-resCh:
-		return res, nil
-	case err := <-errCh:
-		return js.Undefined(), err
-	}
-}

request.go

@@ -1,33 +1,139 @@
 package wasmhttp
 
 import (
-	"bytes"
+	"io"
 	"net/http"
-	"net/http/httptest"
+	"net/url"
 	"syscall/js"
+
+	promise "github.com/nlepage/go-js-promise"
+	"github.com/nlepage/go-wasm-http-server/v2/internal/readablestream"
+	"github.com/nlepage/go-wasm-http-server/v2/internal/safejs"
+)
+
+var (
+	navigator = safejs.Safe(js.Global().Get("navigator"))
 )
 
 // Request builds and returns the equivalent http.Request
-func Request(r js.Value) *http.Request {
+func Request(uvalue js.Value) (*http.Request, error) {
-	jsBody := js.Global().Get("Uint8Array").New(Await(r.Call("arrayBuffer")))
+	value := safejs.Safe(uvalue)
-	body := make([]byte, jsBody.Get("length").Int())
-	js.CopyBytesToGo(body, jsBody)
 
-	req := httptest.NewRequest(
+	method, err := value.GetString("method")
-		r.Get("method").String(),
+	if err != nil {
-		r.Get("url").String(),
+		return nil, err
-		bytes.NewBuffer(body),
-	)
-
-	headersIt := r.Get("headers").Call("entries")
-	for {
-		e := headersIt.Call("next")
-		if e.Get("done").Bool() {
-			break
-		}
-		v := e.Get("value")
-		req.Header.Set(v.Index(0).String(), v.Index(1).String())
 	}
 
-	return req
+	rawURL, err := value.GetString("url")
+	if err != nil {
+		return nil, err
+	}
+	u, err := url.Parse(rawURL)
+	if err != nil {
+		return nil, err
+	}
+
+	body, err := value.Get("body")
+	if err != nil {
+		return nil, err
+	}
+
+	var bodyReader io.ReadCloser
+
+	if !body.IsNull() {
+		// WORKAROUND: Firefox does not have request.body ReadableStream
+		if body.IsUndefined() {
+			blobp, err := value.Call("blob")
+			if err != nil {
+				return nil, err
+			}
+
+			blob, err := promise.Await(safejs.Unsafe(blobp))
+			if err != nil {
+				return nil, err
+			}
+
+			body, err = safejs.Safe(blob).Call("stream")
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		r, err := body.Call("getReader")
+		if err != nil {
+			return nil, err
+		}
+
+		bodyReader = readablestream.NewReader(r)
+	}
+
+	req := &http.Request{
+		Method:     method,
+		URL:        u,
+		Host:       u.Host,
+		Body:       bodyReader,
+		Header:     make(http.Header),
+		Proto:      "HTTP/1.1",
+		ProtoMajor: 1,
+		ProtoMinor: 1,
+		RequestURI: rawURL,
+	}
+
+	referer, err := value.GetString("referrer")
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Referer", referer)
+
+	headers, err := value.Get("headers")
+	if err != nil {
+		return nil, err
+	}
+
+	headersIt, err := headers.Call("entries")
+	if err != nil {
+		return nil, err
+	}
+	for {
+		e, err := headersIt.Call("next")
+		if err != nil {
+			return nil, err
+		}
+
+		done, err := e.GetBool("done")
+		if err != nil {
+			return nil, err
+		}
+
+		if done {
+			break
+		}
+
+		v, err := e.Get("value")
+		if err != nil {
+			return nil, err
+		}
+
+		key, err := v.IndexString(0)
+		if err != nil {
+			return nil, err
+		}
+
+		value, err := v.IndexString(1)
+		if err != nil {
+			return nil, err
+		}
+
+		req.Header.Set(key, value)
+	}
+
+	if req.UserAgent() == "" {
+		userAgent, err := navigator.GetString("userAgent")
+		if err != nil {
+			return nil, err
+		}
+		req.Header.Set("User-Agent", userAgent)
+	}
+
+	return req, nil
 }

response.go

@@ -0,0 +1,178 @@
+package wasmhttp
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"io"
+	"log/slog"
+	"net/http"
+	"syscall/js"
+
+	promise "github.com/nlepage/go-js-promise"
+
+	"github.com/nlepage/go-wasm-http-server/v2/internal/jstype"
+	"github.com/nlepage/go-wasm-http-server/v2/internal/readablestream"
+	"github.com/nlepage/go-wasm-http-server/v2/internal/safejs"
+)
+
+type Response interface {
+	http.ResponseWriter
+	io.StringWriter
+	http.Flusher
+	io.Closer
+	Context() context.Context
+	WriteError(string)
+	JSValue() js.Value
+}
+
+type response struct {
+	header      http.Header
+	wroteHeader bool
+
+	promise js.Value
+	resolve func(any)
+
+	rs   *readablestream.Writer
+	body *bufio.Writer
+}
+
+func NewResponse() (Response, error) {
+	rs, err := readablestream.NewWriter()
+	if err != nil {
+		return nil, err
+	}
+
+	promise, resolve, _ := promise.New()
+
+	return &response{
+		promise: promise,
+		resolve: resolve,
+
+		rs:   rs,
+		body: bufio.NewWriter(rs),
+	}, nil
+}
+
+var _ Response = (*response)(nil)
+
+// Header implements [http.ResponseWriter].
+func (r *response) Header() http.Header {
+	if r.header == nil {
+		r.header = make(http.Header)
+	}
+	return r.header
+}
+
+func (r *response) headerValue() map[string]any {
+	h := r.Header()
+	hh := make(map[string]any, len(h)+1)
+	for k := range h {
+		hh[k] = h.Get(k)
+	}
+	return hh
+}
+
+// Write implements http.ResponseWriter.
+func (r *response) Write(buf []byte) (int, error) {
+	r.writeHeader(buf, "")
+	return r.body.Write(buf)
+}
+
+// WriteHeader implements [http.ResponseWriter].
+func (r *response) WriteHeader(code int) {
+	if r.wroteHeader {
+		return
+	}
+
+	checkWriteHeaderCode(code)
+
+	init, err := safejs.ValueOf(map[string]any{
+		"status":  code,
+		"headers": r.headerValue(),
+	})
+	if err != nil {
+		panic(err)
+	}
+
+	res, err := jstype.Response.New(r.rs.Value, init)
+	if err != nil {
+		panic(err)
+	}
+
+	r.wroteHeader = true
+
+	r.resolve(safejs.Unsafe(res))
+}
+
+// WriteString implements [io.StringWriter].
+func (r *response) WriteString(str string) (int, error) {
+	r.writeHeader(nil, str)
+	return r.body.WriteString(str)
+}
+
+// Flush implements [http.Flusher]
+func (r *response) Flush() {
+	if !r.wroteHeader {
+		r.WriteHeader(200)
+	}
+	if err := r.body.Flush(); err != nil {
+		panic(err)
+	}
+}
+
+// Close implements [io.Closer]
+func (r *response) Close() error {
+	if !r.wroteHeader {
+		r.WriteHeader(200)
+	}
+	if err := r.body.Flush(); err != nil {
+		return err
+	}
+	return r.rs.Close()
+}
+
+func (r *response) Context() context.Context {
+	return r.rs.Context()
+}
+
+func (r *response) WriteError(str string) {
+	slog.Error(str)
+	if !r.wroteHeader {
+		r.Header().Set("Content-Type", "text/plain")
+		r.WriteHeader(500)
+		_, _ = r.WriteString(str)
+	}
+}
+
+func (r *response) JSValue() js.Value {
+	return r.promise
+}
+
+func (r *response) writeHeader(b []byte, str string) {
+	if r.wroteHeader {
+		return
+	}
+
+	m := r.Header()
+
+	_, hasType := m["Content-Type"]
+	hasTE := m.Get("Transfer-Encoding") != ""
+	if !hasType && !hasTE {
+		if b == nil {
+			if len(str) > 512 {
+				str = str[:512]
+			}
+			b = []byte(str)
+		}
+		m.Set("Content-Type", http.DetectContentType(b))
+	}
+
+	r.WriteHeader(200)
+}
+
+func checkWriteHeaderCode(code int) {
+	if code < 100 || code > 999 {
+		panic(fmt.Sprintf("invalid WriteHeader code %v", code))
+	}
+}

response_recorder.go

@@ -1,50 +0,0 @@
-package wasmhttp
-
-import (
-	"io/ioutil"
-	"net/http/httptest"
-	"syscall/js"
-)
-
-// ResponseRecorder extends httptest.ResponseRecorder and implements js.Wrapper
-type ResponseRecorder struct {
-	*httptest.ResponseRecorder
-}
-
-// NewResponseRecorder returns a new ResponseRecorder
-func NewResponseRecorder() ResponseRecorder {
-	return ResponseRecorder{httptest.NewRecorder()}
-}
-
-var _ js.Wrapper = ResponseRecorder{}
-
-// JSValue builds and returns the equivalent JS Response (implementing js.Wrapper)
-func (rr ResponseRecorder) JSValue() js.Value {
-	var res = rr.Result()
-
-	var body js.Value = js.Undefined()
-	if res.ContentLength != 0 {
-		var b, err = ioutil.ReadAll(res.Body)
-		if err != nil {
-			panic(err)
-		}
-		body = js.Global().Get("Uint8Array").New(len(b))
-		js.CopyBytesToJS(body, b)
-	}
-
-	var init = make(map[string]interface{}, 2)
-
-	if res.StatusCode != 0 {
-		init["status"] = res.StatusCode
-	}
-
-	if len(res.Header) != 0 {
-		var headers = make(map[string]interface{}, len(res.Header))
-		for k := range res.Header {
-			headers[k] = res.Header.Get(k)
-		}
-		init["headers"] = headers
-	}
-
-	return js.Global().Get("Response").New(body, init)
-}

serve.go

@@ -1,55 +1,85 @@
 package wasmhttp
 
 import (
+	"context"
 	"fmt"
 	"net/http"
+	"os"
 	"strings"
 	"syscall/js"
+
+	"github.com/nlepage/go-wasm-http-server/v2/internal/safejs"
+)
+
+var (
+	wasmhttp = safejs.Safe(js.Global().Get("wasmhttp"))
 )
 
 // Serve serves HTTP requests using handler or http.DefaultServeMux if handler is nil.
-func Serve(handler http.Handler) func() {
+func Serve(handler http.Handler) (func(), error) {
-	var h = handler
+	h := handler
 	if h == nil {
 		h = http.DefaultServeMux
 	}
 
-	var prefix = js.Global().Get("wasmhttp").Get("path").String()
+	path := os.Getenv("WASM_HTTP_PATH")
+	prefix := path
+
 	for strings.HasSuffix(prefix, "/") {
 		prefix = strings.TrimSuffix(prefix, "/")
 	}
 
 	if prefix != "" {
-		var mux = http.NewServeMux()
+		mux := http.NewServeMux()
 		mux.Handle(prefix+"/", http.StripPrefix(prefix, h))
 		h = mux
 	}
 
-	var cb = js.FuncOf(func(_ js.Value, args []js.Value) interface{} {
+	handlerValue, err := safejs.FuncOf(func(_ safejs.Value, args []safejs.Value) interface{} {
-		var resPromise, resolve, reject = NewPromise()
+		res, err := NewResponse()
+		if err != nil {
+			panic(err)
+		}
 
 		go func() {
+			ctx, cancel := context.WithCancel(res.Context())
+
 			defer func() {
-				if r := recover(); r != nil {
+				cancel()
-					if err, ok := r.(error); ok {
+			}()
-						reject(fmt.Sprintf("wasmhttp: panic: %+v\n", err))
+
-					} else {
+			defer func() {
-						reject(fmt.Sprintf("wasmhttp: panic: %v\n", r))
+				if err := res.Close(); err != nil {
-					}
+					panic(err)
 				}
 			}()
 
-			var res = NewResponseRecorder()
+			defer func() {
+				if r := recover(); r != nil {
+					res.WriteError(fmt.Sprintf("%+v", r))
+				}
+			}()
 
-			h.ServeHTTP(res, Request(args[0]))
+			req, err := Request(safejs.Unsafe(args[0]))
+			if err != nil {
+				res.WriteError(fmt.Sprintf("%+v", err))
+				return
+			}
 
-			resolve(res)
+			req = req.WithContext(ctx)
+
+			h.ServeHTTP(res, req)
 		}()
 
-		return resPromise
+		return res.JSValue()
 	})
+	if err != nil {
+		return nil, err
+	}
 
-	js.Global().Get("wasmhttp").Call("setHandler", cb)
+	if _, err = wasmhttp.Call("setHandler", path, handlerValue); err != nil {
+		return nil, err
+	}
 
-	return cb.Release
+	return handlerValue.Release, nil
 }

sw.js

@@ -1,36 +1,94 @@
-importScripts('https://cdn.jsdelivr.net/gh/golang/go@go1.15.7/misc/wasm/wasm_exec.js')
+class WasmHTTP {
+  #listeners = new Map();
 
-function registerWasmHTTPListener(wasm, { base, args = [] } = {}) {
+  setHandler(path, handler) {
-  let path = new URL(registration.scope).pathname
+    const listener = this.#listeners.get(path);
-  if (base && base !== '') path = `${trimEnd(path, '/')}/${trimStart(base, '/')}`
+    if (!listener) {
-
+      throw new Error(`no listener for path "${path}"`);
-  const handlerPromise = new Promise(setHandler => {
-    self.wasmhttp = {
-      path,
-      setHandler,
     }
-  })
 
-  const go = new Go()
+    listener.setHandler(handler);
-  go.argv = [wasm, ...args]
+  }
-  WebAssembly.instantiateStreaming(fetch(wasm), go.importObject).then(({ instance }) => go.run(instance))
 
-  addEventListener('fetch', e => {
+  handle(e) {
-    const { pathname } = new URL(e.request.url)
+    const { pathname } = new URL(e.request.url);
-    if (!pathname.startsWith(path)) return
 
-    e.respondWith(handlerPromise.then(handler => handler(e.request)))
+    for (const [path, listener] of this.#listeners) {
-  })
+      if (pathname.startsWith(path)) {
+        listener.handle(e);
+        return;
+      }
+    }
+  }
+
+  addListener({ wasm, base = '', cacheName, passthrough, args = [], env = {} }) {
+    const path = new URL(trimStart(base, '/'), registration.scope).pathname;
+
+    if (this.#listeners.has(path)) {
+      throw new Error(`a listener is already registered for path "${path}"`);
+    }
+
+    this.#listeners.set(path, new WasmHTTPListener({ wasm, path, cacheName, passthrough, args, env }));
+  }
+}
+
+class WasmHTTPListener {
+  #handlerPromise;
+  #resolveHandler;
+  #passthrough;
+
+  constructor({ wasm, path, cacheName, passthrough, args, env }) {
+    this.#handlerPromise = new Promise((resolve) => {
+      this.#resolveHandler = resolve;
+    });
+
+    this.#passthrough = passthrough;
+
+    this.#run({ wasm, path, cacheName, passthrough, args, env });
+  }
+
+  async #run({ wasm, path, cacheName, args, env }) {
+    try {
+      const go = new Go();
+      go.argv = [wasm, ...args];
+      go.env = { ...env, WASM_HTTP_PATH: path };
+
+      const cache = cacheName ? await caches.open(cacheName) : caches;
+      const source = (await cache.match(wasm)) ?? (await fetch(wasm));
+
+      const { instance } = await WebAssembly.instantiateStreaming(source, go.importObject);
+
+      await go.run(instance);
+    } catch (err) {
+      console.error(`error while running ${wasm} for path "${path}"`, err);
+    }
+  }
+
+  setHandler(handler) {
+    this.#resolveHandler(handler);
+  }
+
+  handle(e) {
+    if (this.#passthrough?.(e.request)) return;
+
+    // FIXME return 500 if run has thrown
+
+    e.respondWith(this.#handlerPromise.then((handler) => handler(e.request)));
+  }
+}
+
+self.wasmhttp = new WasmHTTP();
+
+addEventListener('fetch', (e) => {
+  self.wasmhttp.handle(e);
+});
+
+function registerWasmHTTPListener(wasm, { base, cacheName, passthrough, args, env } = {}) {
+  self.wasmhttp.addListener({ wasm, base, cacheName, passthrough, args, env });
 }
 
 function trimStart(s, c) {
-  let r = s
+  let r = s;
-  while (r.startsWith(c)) r = r.slice(c.length)
+  while (r.startsWith(c)) r = r.slice(c.length);
-  return r
+  return r;
-}
-
-function trimEnd(s, c) {
-  let r = s
-  while (r.endsWith(c)) r = r.slice(0, -c.length)
-  return r
 }