mirror of
https://github.com/denoland/deno.git
synced 2024-11-23 15:16:54 -05:00
88 lines
2.5 KiB
Markdown
88 lines
2.5 KiB
Markdown
# 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.
|
||
|
||
> ℹ️ The _native_ HTTP server is currently unstable, meaning the API is not
|
||
> finalized and may change in breaking ways in future version of Deno. To have
|
||
> the APIs discussed here available, you must run Deno with the `--unstable`
|
||
> flag.
|
||
|
||
## Sample web server
|
||
|
||
In this example, the user-agent of the client is returned to the client:
|
||
|
||
**webserver.ts**:
|
||
|
||
```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
|
||
// in its own async function.
|
||
(async () => {
|
||
// 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${requestEvent.request.headers.get(
|
||
"user-agent",
|
||
) ?? "Unknown"}`;
|
||
// The requestEvent's `.respondWith()` method is how we send the response
|
||
// back to the client.
|
||
requestEvent.respondWith(
|
||
new Response(body, {
|
||
status: 200,
|
||
}),
|
||
);
|
||
}
|
||
})();
|
||
}
|
||
```
|
||
|
||
Then run this with:
|
||
|
||
```shell
|
||
deno run --allow-net --unstable webserver.ts
|
||
```
|
||
|
||
Then navigate to `http://localhost:8080/` in a browser.
|
||
|
||
### Using the `std/http` library
|
||
|
||
If you do not want to use the unstable APIs, you can still use the standard
|
||
library's HTTP server:
|
||
|
||
**webserver.ts**:
|
||
|
||
```ts
|
||
import { serve } from "https://deno.land/std@$STD_VERSION/http/server.ts";
|
||
|
||
const server = serve({ port: 8080 });
|
||
console.log(`HTTP webserver running. Access it at: http://localhost:8080/`);
|
||
|
||
for await (const request of server) {
|
||
let bodyContent = "Your user-agent is:\n\n";
|
||
bodyContent += request.headers.get("user-agent") || "Unknown";
|
||
|
||
request.respond({ status: 200, body: bodyContent });
|
||
}
|
||
```
|
||
|
||
Then run this with:
|
||
|
||
```shell
|
||
deno run --allow-net webserver.ts
|
||
```
|