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HTTP Server: Hello world

An example of a HTTP server that serves a "Hello World" message.

HTTP servers need a handler function. This function is called for every request that comes in. It must return a `Response`. The handler function can be asynchronous (it may return a `Promise`).

function handler(_req: Request): Response {
  return new Response("Hello, World!");
}

To start the server on the default port, call `Deno.serve` with the handler.

Deno.serve(handler);

Run this example locally using the Deno CLI:

deno run -N https://docs.deno.com/examples/scripts/http_server.ts

Try this example in a Deno Deploy playground

• Doc: Deno.serve
• MDN: Response

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