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
+}

.prettierrc

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

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

@@ -6,9 +6,6 @@
   <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>
 
 > Embed your Go HTTP handlers in a ServiceWorker (using [WebAssembly](https://mdn.io/WebAssembly/)) and emulate an HTTP server!
@@ -18,13 +15,18 @@
  - [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))
  - [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/))
  - [😺 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))
-
+ - [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)
 
 ## How?
 
-Talk given at the Go devroom of FOSDEM 2021 explaining how `go-wasm-http-server` works:
+Below is a talk given at the Go devroom of FOSDEM 2021 explaining how `go-wasm-http-server` works.
+
+> [!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`.
 
 [![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)
 
@@ -39,6 +41,7 @@ The slides are available [here](https://nlepage.github.io/go-wasm-http-talk/).
 `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
 
@@ -48,7 +51,7 @@ In your Go code, replace [`http.ListenAndServe()`](https://pkg.go.dev/net/http#L
 
 📄 `server.go`
 ```go
-// +build !js,!wasm
+//go:build !js && !wasm
 
 package main
 
@@ -67,7 +70,7 @@ becomes:
 
 📄 `server_js_wasm.go`
 ```go
-// +build js,wasm
+//go:build js && wasm
 
 package main
 
@@ -87,17 +90,37 @@ You may want to use build tags as shown above (or file name suffixes) in order t
 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
-importScripts('https://cdn.jsdelivr.net/gh/golang/go@go1.18.4/misc/wasm/wasm_exec.js')
+// Note the 'go.1.23.4' below, that matches the version you just found:
-importScripts('https://cdn.jsdelivr.net/gh/nlepage/go-wasm-http-server@v2.0.2/sw.js')
+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')
 ```
@@ -163,15 +186,44 @@ URL string of the WebAssembly module, example: `"path/to/my-module.wasm"`.
 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.
 
-## Author
+## <abbr title="Frequently Asked Questions">FAQ</abbr> ❓
 
-👤 **Nicolas Lepage**
+### Are WebSockets supported?
 
-* Website: https://nicolas.lepage.dev/
+No, WebSockets aren’t and won’t be supported, because Service Workers cannot intercept websocket connections.
-* Twitter: [@njblepage](https://twitter.com/njblepage)
+
-* Github: [@nlepage](https://github.com/nlepage)
+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
 
@@ -183,7 +235,7 @@ 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.
 
 ***

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/index.html

@@ -1,32 +1,56 @@
 <!DOCTYPE html>
 <html>
   <head>
-    <title>go-wasm-http-server hello demo</title>
+    <title>go-wasm-http-server hello sse demo</title>
     <script>
-      navigator.serviceWorker.register('sw.js')
+      navigator.serviceWorker.register('sw.js').then((registration) => {
-        .then(registration => {
+        const serviceWorker = registration.installing ?? registration.waiting ?? registration.active;
-          const serviceWorker = registration.installing ?? registration.waiting ?? registration.active
         if (serviceWorker.state === 'activated') {
-            startEventSource()
+          document.querySelector('#open-button').disabled = false;
         } else {
-            serviceWorker.addEventListener('statechange', e => {
+          serviceWorker.addEventListener('statechange', (e) => {
-              if (e.target.state === 'activated') startEventSource()
+            if (e.target.state === 'activated') {
-            })
+              document.querySelector('#open-button').disabled = false;
             }
-        })
+          });
+        }
+      });
 
-      function startEventSource() {
+      window.addEventListener('DOMContentLoaded', () => {
-        const es = new EventSource('/api/events')
+        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 p = document.createElement('p')
+            const li = document.createElement('li');
-          p.textContent = `ping: data=${e.data}`
+            li.textContent = `ping: data=${e.data}`;
-          document.body.append(p)
+            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', () => {
-          es.close()
+          if (!es) return;
-        })
+          es.close();
-      }
+        });
+      });
     </script>
   </head>
-  <body></body>
+  <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

@@ -1,12 +1,14 @@
-importScripts('https://cdn.jsdelivr.net/gh/golang/go@go1.23.1/misc/wasm/wasm_exec.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@v2.0.2/sw.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 => {
+addEventListener('activate', (event) => {
-  event.waitUntil(clients.claim())
+  event.waitUntil(clients.claim());
-})
+});
 
-registerWasmHTTPListener('api.wasm', { base: 'api' })
+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

@@ -1,14 +1,16 @@
-importScripts('https://cdn.jsdelivr.net/gh/golang/go@go1.23.1/misc/wasm/wasm_exec.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@v2.0.2/sw.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 => {
+addEventListener('install', (event) => {
-  event.waitUntil(clients.claim())
+  event.waitUntil(caches.open('examples').then((cache) => cache.add(wasm)));
-})
+});
 
-addEventListener('message', () => {})
+addEventListener('activate', (event) => {
+  event.waitUntil(clients.claim());
+});
 
-registerWasmHTTPListener('../hello-state/api.wasm', { base: 'api' })
+addEventListener('message', () => {});
+
+registerWasmHTTPListener(wasm, { base: 'api' });

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

@@ -1,12 +1,14 @@
-importScripts('https://cdn.jsdelivr.net/gh/golang/go@go1.23.1/misc/wasm/wasm_exec.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@v2.0.2/sw.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 => {
+addEventListener('activate', (event) => {
-  event.waitUntil(clients.claim())
+  event.waitUntil(clients.claim());
-})
+});
 
-registerWasmHTTPListener('api.wasm', { base: 'api' })
+registerWasmHTTPListener(wasm, { base: 'api' });

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

@@ -1,12 +1,14 @@
-importScripts('https://cdn.jsdelivr.net/gh/golang/go@go1.23.1/misc/wasm/wasm_exec.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@v2.0.2/sw.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 => {
+addEventListener('activate', (event) => {
-  event.waitUntil(clients.claim())
+  event.waitUntil(clients.claim());
-})
+});
 
-registerWasmHTTPListener('api.wasm', { base: 'api' })
+registerWasmHTTPListener(wasm, { base: 'api' });

docs/index.html

@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <title>go-wasm-http-server examples</title>
+  </head>
+  <body>
+    <h1>go-wasm-http-server examples</h1>
+    <ul>
+      <li>
+        <a href="hello/">Hello example</a> (<a
+          href="https://github.com/nlepage/go-wasm-http-server/tree/master/docs/hello"
+          >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 {}
+}

go.mod

@@ -1,9 +1,9 @@
 module github.com/nlepage/go-wasm-http-server/v2
 
-go 1.18
+go 1.22
 
 require (
 	github.com/hack-pad/safejs v0.1.1
-	github.com/nlepage/go-js-promise v1.0.0
+	github.com/nlepage/go-js-promise v1.1.0
-	github.com/tmaxmax/go-sse v0.8.0
+	github.com/tmaxmax/go-sse v0.11.0
 )

go.sum

@@ -1,6 +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 v1.0.0 h1:K7OmJ3+0BgWJ2LfXchg2sI6RDr7AW/KWR8182epFwGQ=
+github.com/nlepage/go-js-promise v1.1.0 h1:BfvywsIMo4cpNOKyoReBWkxEW8f9HMwXqGc45wEKPRs=
-github.com/nlepage/go-js-promise v1.0.0/go.mod h1:bdOP0wObXu34euibyK39K1hoBCtlgTKXGc56AGflaRo=
+github.com/nlepage/go-js-promise v1.1.0/go.mod h1:bdOP0wObXu34euibyK39K1hoBCtlgTKXGc56AGflaRo=
-github.com/tmaxmax/go-sse v0.8.0 h1:pPpTgyyi1r7vG2o6icebnpGEh3ebcnBXqDWkb7aTofs=
+github.com/tmaxmax/go-sse v0.11.0 h1:nogmJM6rJUoOLoAwEKeQe5XlVpt9l7N82SS1jI7lWFg=
-github.com/tmaxmax/go-sse v0.8.0/go.mod h1:HLoxqxdH+7oSUItjtnpxjzJedfr/+Rrm/dNWBcTxJFM=
+github.com/tmaxmax/go-sse v0.11.0/go.mod h1:u/2kZQR1tyngo1lKaNCj1mJmhXGZWS1Zs5yiSOD+Eg8=

internal/readablestream/reader.go

@@ -14,7 +14,7 @@ type Reader struct {
 	off   int
 }
 
-var _ io.Reader = (*Reader)(nil)
+var _ io.ReadCloser = (*Reader)(nil)
 
 func NewReader(r safejs.Value) *Reader {
 	return &Reader{
@@ -83,3 +83,14 @@ func (r *Reader) Read(p []byte) (int, error) {
 
 	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

@@ -12,11 +12,14 @@ 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
 
@@ -34,6 +37,7 @@ func NewWriter() (*Writer, error) {
 
 	cancel, err = safejs.FuncOf(func(_ safejs.Value, _ []safejs.Value) any {
 		defer cancel.Release()
+		rs.cancelled = true
 		cancelCtx()
 		return nil
 	})
@@ -54,14 +58,20 @@ func NewWriter() (*Writer, error) {
 		return nil, err
 	}
 
-	return &Writer{
+	rs = &Writer{
 		Value:      value,
 		controller: controller,
 		ctx:        ctx,
-	}, nil
+	}
+
+	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
@@ -78,8 +88,12 @@ func (rs *Writer) Write(b []byte) (int, error) {
 }
 
 func (rs *Writer) Close() error {
-	rs.controller.Call("close")
+	if rs.cancelled {
 		return nil
+	}
+
+	_, err := rs.controller.Call("close")
+	return err
 }
 
 func (rs *Writer) Context() context.Context {

package-lock.json

@@ -0,0 +1,787 @@
+{
+  "name": "go-wasm-http-server",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "go-wasm-http-server",
+      "version": "0.1.0",
+      "license": "Apache-2.0",
+      "devDependencies": {
+        "all-contributors-cli": "^6.26.1"
+      }
+    },
+    "node_modules/@babel/runtime": {
+      "version": "7.26.0",
+      "resolved": "https://registry.npmjs.org/@babel/runtime/-/runtime-7.26.0.tgz",
+      "integrity": "sha512-FDSOghenHTiToteC/QRlv2q3DhPZ/oOXTBoirfWNx1Cx3TMVcGWQtMMmQcSvb/JjpNeGzx8Pq/b4fKEJuWm1sw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "regenerator-runtime": "^0.14.0"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/all-contributors-cli": {
+      "version": "6.26.1",
+      "resolved": "https://registry.npmjs.org/all-contributors-cli/-/all-contributors-cli-6.26.1.tgz",
+      "integrity": "sha512-Ymgo3FJACRBEd1eE653FD1J/+uD0kqpUNYfr9zNC1Qby0LgbhDBzB3EF6uvkAbYpycStkk41J+0oo37Lc02yEw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@babel/runtime": "^7.7.6",
+        "async": "^3.1.0",
+        "chalk": "^4.0.0",
+        "didyoumean": "^1.2.1",
+        "inquirer": "^7.3.3",
+        "json-fixer": "^1.6.8",
+        "lodash": "^4.11.2",
+        "node-fetch": "^2.6.0",
+        "pify": "^5.0.0",
+        "yargs": "^15.0.1"
+      },
+      "bin": {
+        "all-contributors": "dist/cli.js"
+      },
+      "engines": {
+        "node": ">=4"
+      },
+      "optionalDependencies": {
+        "prettier": "^2"
+      }
+    },
+    "node_modules/ansi-escapes": {
+      "version": "4.3.2",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.2.tgz",
+      "integrity": "sha512-gKXj5ALrKWQLsYG9jlTRmR/xKluxHV+Z9QEwNIgCfM1/uwPMCuzVVnh5mwTd+OuBZcwSIMbqssNWRm1lE51QaQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "type-fest": "^0.21.3"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/async": {
+      "version": "3.2.6",
+      "resolved": "https://registry.npmjs.org/async/-/async-3.2.6.tgz",
+      "integrity": "sha512-htCUDlxyyCLMgaM3xXg0C0LW2xqfuQ6p05pCEIsXuyQ+a1koYKTuBMzRNwmybfLgvJDMd0r1LTn4+E0Ti6C2AA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/camelcase": {
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
+      "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/chalk": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.1.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
+    "node_modules/chardet": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/chardet/-/chardet-0.7.0.tgz",
+      "integrity": "sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/cli-cursor": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/cli-cursor/-/cli-cursor-3.1.0.tgz",
+      "integrity": "sha512-I/zHAwsKf9FqGoXM4WWRACob9+SNukZTd94DWF57E4toouRulbCxcUh6RKUEOQlYTHJnzkPMySvPNaaSLNfLZw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "restore-cursor": "^3.1.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/cli-width": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/cli-width/-/cli-width-3.0.0.tgz",
+      "integrity": "sha512-FxqpkPPwu1HjuN93Omfm4h8uIanXofW0RxVEW3k5RKx+mJJYSthzNhp32Kzxxy3YAEZ/Dc/EWN1vZRY0+kOhbw==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/cliui": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-6.0.0.tgz",
+      "integrity": "sha512-t6wbgtoCXvAzst7QgXxJYqPt0usEfbgQdftEPbLL/cvv6HPE5VgvqCuAIDR0NgU52ds6rFwqrgakNLrHEjCbrQ==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.0",
+        "wrap-ansi": "^6.2.0"
+      }
+    },
+    "node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
+      }
+    },
+    "node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/decamelize": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+      "integrity": "sha512-z2S+W9X73hAUUki+N+9Za2lBlun89zigOyGrsax+KUQ6wKW4ZoWpEYBkGhQjwAjjDCkWxhY0VKEhk8wzY7F5cA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/didyoumean": {
+      "version": "1.2.2",
+      "resolved": "https://registry.npmjs.org/didyoumean/-/didyoumean-1.2.2.tgz",
+      "integrity": "sha512-gxtyfqMg7GKyhQmb056K7M3xszy/myH8w+B4RT+QXBQsvAOdc3XymqDDPHx1BgPgsdAA5SIifona89YtRATDzw==",
+      "dev": true,
+      "license": "Apache-2.0"
+    },
+    "node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "dev": true,
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+      "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.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"
+  }
 }

request.go

@@ -3,13 +3,18 @@ package wasmhttp
 import (
 	"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(uvalue js.Value) (*http.Request, error) {
 	value := safejs.Safe(uvalue)
@@ -19,7 +24,11 @@ func Request(uvalue js.Value) (*http.Request, error) {
 		return nil, err
 	}
 
-	url, err := value.GetString("url")
+	rawURL, err := value.GetString("url")
+	if err != nil {
+		return nil, err
+	}
+	u, err := url.Parse(rawURL)
 	if err != nil {
 		return nil, err
 	}
@@ -29,8 +38,27 @@ func Request(uvalue js.Value) (*http.Request, error) {
 		return nil, err
 	}
 
-	var bodyReader io.Reader
+	var bodyReader io.ReadCloser
-	if !body.IsUndefined() && !body.IsNull() {
+
+	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
@@ -39,11 +67,23 @@ func Request(uvalue js.Value) (*http.Request, error) {
 		bodyReader = readablestream.NewReader(r)
 	}
 
-	req := httptest.NewRequest(
+	req := &http.Request{
-		method,
+		Method:     method,
-		url,
+		URL:        u,
-		bodyReader,
+		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 {
@@ -87,5 +127,13 @@ func Request(uvalue js.Value) (*http.Request, error) {
 		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

@@ -123,6 +123,9 @@ func (r *response) Flush() {
 
 // Close implements [io.Closer]
 func (r *response) Close() error {
+	if !r.wroteHeader {
+		r.WriteHeader(200)
+	}
 	if err := r.body.Flush(); err != nil {
 		return err
 	}
@@ -136,6 +139,7 @@ func (r *response) Context() context.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)
 	}

serve.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"net/http"
+	"os"
 	"strings"
 	"syscall/js"
 
@@ -21,10 +22,8 @@ func Serve(handler http.Handler) (func(), error) {
 		h = http.DefaultServeMux
 	}
 
-	prefix, err := wasmhttp.GetString("path")
+	path := os.Getenv("WASM_HTTP_PATH")
-	if err != nil {
+	prefix := path
-		return nil, err
-	}
 
 	for strings.HasSuffix(prefix, "/") {
 		prefix = strings.TrimSuffix(prefix, "/")
@@ -78,7 +77,7 @@ func Serve(handler http.Handler) (func(), error) {
 		return nil, err
 	}
 
-	if _, err = wasmhttp.Call("setHandler", handlerValue); err != nil {
+	if _, err = wasmhttp.Call("setHandler", path, handlerValue); err != nil {
 		return nil, err
 	}
 

sw.js

@@ -1,34 +1,94 @@
-function registerWasmHTTPListener(wasm, { base, args = [] } = {}) {
+class WasmHTTP {
-  let path = new URL(registration.scope).pathname
+  #listeners = new Map();
-  if (base && base !== '') path = `${trimEnd(path, '/')}/${trimStart(base, '/')}`
 
-  const handlerPromise = new Promise(setHandler => {
+  setHandler(path, handler) {
-    self.wasmhttp = {
+    const listener = this.#listeners.get(path);
-      path,
+    if (!listener) {
-      setHandler,
+      throw new Error(`no listener for path "${path}"`);
     }
-  })
 
-  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
 }