Http Server in Dart

import 'dart:io';

// A fundamental concept in HTTP servers is handlers. In Dart, we can use
// functions with the appropriate signature as handlers.

void hello(HttpRequest request) {
  // Functions serving as handlers take an HttpRequest as an argument.
  // We can use the response property to fill in the HTTP response.
  // Here our simple response is just "hello\n".
  request.response.write('hello\n');
  request.response.close();
}

void headers(HttpRequest request) {
  // This handler does something a little more sophisticated by reading
  // all the HTTP request headers and echoing them into the response body.
  request.headers.forEach((name, values) {
    for (var v in values) {
      request.response.write('$name: $v\n');
    }
  });
  request.response.close();
}

void main() async {
  // We create a HttpServer and listen on a port.
  final server = await HttpServer.bind(InternetAddress.loopbackIPv4, 8090);
  print('Listening on localhost:${server.port}');

  // We handle requests using a switch statement on the request's URI path.
  await for (HttpRequest request in server) {
    switch (request.uri.path) {
      case '/hello':
        hello(request);
        break;
      case '/headers':
        headers(request);
        break;
      default:
        request.response.statusCode = HttpStatus.notFound;
        request.response.close();
    }
  }
}

To run the server:

Save the code in a file named http_server.dart.
Run the server using the Dart VM:

$ dart run http_server.dart
Listening on localhost:8090

You can then access the server using curl:

$ curl localhost:8090/hello
hello

$ curl localhost:8090/headers
host: localhost:8090
user-agent: curl/7.68.0
accept: */*

This Dart code creates a simple HTTP server that listens on port 8090 and handles two routes: /hello and /headers. The /hello route responds with a simple “hello” message, while the /headers route echoes back all the headers from the incoming request.

The main differences from the original example are:

Dart uses the dart:io library for HTTP server functionality instead of net/http.
In Dart, we create an HttpServer instance and use a stream to handle incoming requests, rather than registering handlers with a global function.
Dart’s HttpRequest object combines both the request and response functionality, unlike Go’s separate http.ResponseWriter and http.Request.
Error handling and server shutdown are not explicitly shown in this example, but would be important for a production server.

This example demonstrates how to create a basic HTTP server in Dart, handling different routes and working with request headers.

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Http Server in Dart