bellbind/server.js

## server.js
#!/usr/bin/env -S deno run --allow-net
// Example registration page and its server of API: navigator.registerProtocolHandler()
import {serve} from "https://deno.land/std/http/server.ts";

// A pattern of protocol scheme name is limited with prefix "web+" as web+lowerletters ,
//   or whitelisted names in https://developer.mozilla.org/en-US/docs/Web/API/Navigator/registerProtocolHandler
const protocol = "web+local";

// navigator.registerProtocolHandler() should be called in user inputs (e.g. button click)
// - forwarded url must be same origin of the location.href
const regHtml = `<!doctype html>
<html>
<head>
  <link rel="icon" href="data:image/x-icon;," />
  <script type="module">
document.getElementById("reg").addEventListener("click", () => {
  navigator.registerProtocolHandler(
    "${protocol}", location.href + "%s", "protocol handler example");
});
  </script>
</head>
<body>
  <button id="reg">register protocol: ${protocol}</button> then
  <ul>
    <li>GET <a href="${protocol}:foo">${protocol}:link</a></li>
    <li><form action="${protocol}:form" method="POST"><input type="submit" value="POST ${protocol}:form" /></form></li>
    <li><button onclick='(async () => {
      alert(await (await fetch("${protocol}:fetch")).text());
    })().catch(err => alert(err.message))'>fetch ${protocol}:fetch (but error)</button></li>
    <li>Or type "${protocol}:bar" into URL bar directly</li>
  </ul>
</body>
</html>`;
// NOTE: custom procotol urls are not available with fetch()

await serve(req => {
  console.log(req.method, req.url);
  const url = new URL(req.url);
  if (url.pathname === "/") {
    return new Response(regHtml, {headers: {"content-type": "text/html;charset=utf-8"}});
  }
  // embeded custom protocol can be decoded with decodeURIComponent()
  const decoded = decodeURIComponent(url.pathname.slice(1));
  if (decoded.startsWith(`${protocol}:`)) {
    const value = decoded.slice(protocol.length + 1);
    return new Response(value);
  }
  return new Response("Not Found", {status: 404});
}, {port: 3000});
	#!/usr/bin/env -S deno run --allow-net
	// Example registration page and its server of API: navigator.registerProtocolHandler()
	import {serve} from "https://deno.land/std/http/server.ts";

	// A pattern of protocol scheme name is limited with prefix "web+" as web+lowerletters ,
	// or whitelisted names in https://developer.mozilla.org/en-US/docs/Web/API/Navigator/registerProtocolHandler
	const protocol = "web+local";

	// navigator.registerProtocolHandler() should be called in user inputs (e.g. button click)
	// - forwarded url must be same origin of the location.href
	const regHtml = `<!doctype html>
	<html>
	<head>
	<link rel="icon" href="data:image/x-icon;," />
	<script type="module">
	document.getElementById("reg").addEventListener("click", () => {
	navigator.registerProtocolHandler(
	"${protocol}", location.href + "%s", "protocol handler example");
	});
	</script>
	</head>
	<body>
	<button id="reg">register protocol: ${protocol}</button> then
	<ul>
	<li>GET <a href="${protocol}:foo">${protocol}:link</a></li>
	<li><form action="${protocol}:form" method="POST"><input type="submit" value="POST ${protocol}:form" /></form></li>
	<li><button onclick='(async () => {
	alert(await (await fetch("${protocol}:fetch")).text());
	})().catch(err => alert(err.message))'>fetch ${protocol}:fetch (but error)</button></li>
	<li>Or type "${protocol}:bar" into URL bar directly</li>
	</ul>
	</body>
	</html>`;
	// NOTE: custom procotol urls are not available with fetch()

	await serve(req => {
	console.log(req.method, req.url);
	const url = new URL(req.url);
	if (url.pathname === "/") {
	return new Response(regHtml, {headers: {"content-type": "text/html;charset=utf-8"}});
	}
	// embeded custom protocol can be decoded with decodeURIComponent()
	const decoded = decodeURIComponent(url.pathname.slice(1));
	if (decoded.startsWith(`${protocol}:`)) {
	const value = decoded.slice(protocol.length + 1);
	return new Response(value);
	}
	return new Response("Not Found", {status: 404});
	}, {port: 3000});