Edit
Using the
Simple HTTP Web Server
Concepts
- Use Deno's integrated HTTP server to run your own web server.
Overview
With just a few lines of code you can run your own HTTP web server with control over the response status, request headers and more.
Sample web server
In this example, the user-agent of the client is returned to the client:
webserver.ts:
// Start listening on port 8080 of localhost.
const server = Deno.listen({ port: 8080 });
console.log(`HTTP webserver running. Access it at: http://localhost:8080/`);
// Connections to the server will be yielded up as an async iterable.
for await (const conn of server) {
// In order to not be blocking, we need to handle each connection individually
// without awaiting the function
serveHttp(conn);
}
async function serveHttp(conn: Deno.Conn) {
// This "upgrades" a network connection into an HTTP connection.
const httpConn = Deno.serveHttp(conn);
// Each request sent over the HTTP connection will be yielded as an async
// iterator from the HTTP connection.
for await (const requestEvent of httpConn) {
// The native HTTP server uses the web standard `Request` and `Response`
// objects.
const body = `Your user-agent is:\n\n${
requestEvent.request.headers.get("user-agent") ?? "Unknown"
}`;
// The requestEvent's `.respondWith()` method is how we send the response
// back to the client.
requestEvent.respondWith(
new Response(body, {
status: 200,
}),
);
}
}
Then run this with:
deno run --allow-net webserver.ts
Then navigate to http://localhost:8080/
in a browser.
std/http
library
Using the ℹ️ Since the stabilization of native HTTP bindings in
^1.13.x
, std/http now supports a native HTTP server from ^0.107.0. The legacy server module was removed in 0.117.0.
webserver.ts:
import { serve } from "https://deno.land/std@0.181.0/http/server.ts";
const port = 8080;
const handler = (request: Request): Response => {
const body = `Your user-agent is:\n\n${
request.headers.get("user-agent") ?? "Unknown"
}`;
return new Response(body, { status: 200 });
};
console.log(`HTTP webserver running. Access it at: http://localhost:8080/`);
await serve(handler, { port });
Then run this with:
deno run --allow-net webserver.ts