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88 lines
2.5 KiB
Markdown
88 lines
2.5 KiB
Markdown
# Simple HTTP web server
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## Concepts
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- Use Deno's integrated HTTP server to run your own web server.
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## Overview
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With just a few lines of code you can run your own HTTP web server with control
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over the response status, request headers and more.
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> ℹ️ The _native_ HTTP server is currently unstable, meaning the API is not
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> finalized and may change in breaking ways in future version of Deno. To have
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> the APIs discussed here available, you must run Deno with the `--unstable`
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> flag.
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## Sample web server
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In this example, the user-agent of the client is returned to the client:
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**webserver.ts**:
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```ts
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// Start listening on port 8080 of localhost.
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const server = Deno.listen({ port: 8080 });
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console.log(`HTTP webserver running. Access it at: http://localhost:8080/`);
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// Connections to the server will be yielded up as an async iterable.
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for await (const conn of server) {
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// In order to not be blocking, we need to handle each connection individually
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// in its own async function.
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(async () => {
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// This "upgrades" a network connection into an HTTP connection.
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const httpConn = Deno.serveHttp(conn);
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// Each request sent over the HTTP connection will be yielded as an async
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// iterator from the HTTP connection.
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for await (const requestEvent of httpConn) {
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// The native HTTP server uses the web standard `Request` and `Response`
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// objects.
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const body = `Your user-agent is:\n\n${requestEvent.request.headers.get(
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"user-agent",
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) ?? "Unknown"}`;
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// The requestEvent's `.respondWith()` method is how we send the response
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// back to the client.
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requestEvent.respondWith(
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new Response(body, {
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status: 200,
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}),
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);
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}
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})();
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}
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```
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Then run this with:
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```shell
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deno run --allow-net --unstable webserver.ts
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```
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Then navigate to `http://localhost:8080/` in a browser.
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### Using the `std/http` library
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If you do not want to use the unstable APIs, you can still use the standard
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library's HTTP server:
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**webserver.ts**:
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```ts
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import { serve } from "https://deno.land/std@$STD_VERSION/http/server.ts";
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const server = serve({ port: 8080 });
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console.log(`HTTP webserver running. Access it at: http://localhost:8080/`);
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for await (const request of server) {
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let bodyContent = "Your user-agent is:\n\n";
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bodyContent += request.headers.get("user-agent") || "Unknown";
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request.respond({ status: 200, body: bodyContent });
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}
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```
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Then run this with:
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```shell
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deno run --allow-net webserver.ts
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```
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