Use raw socket in Dart

import 'dart:convert'; import 'dart:io'; void main() async { var socket = await Socket.connect("httpbin.org", 80); socket.writeln("GET /get HTTP/1.1"); socket.writeln("Host:httpbin.org"); socket.writeln("Connection:close"); socket.writeln(); // send request await socket.flush(); // now get response content and decode it with utf-8 String resp = await utf8.decoder.bind(socket).join(); await socket.close(); print(resp); } 

$ dart main.dart HTTP/1.1 200 OK Date: Sat, 18 Dec 2021 04:12:20 GMT Content-Type: application/json Content-Length: 197 Connection: close Server: gunicorn/19.9.0 Access-Control-Allow-Origin: * Access-Control-Allow-Credentials: true { "args": {}, "headers": { "Host": "httpbin.org", "X-Amzn-Trace-Id": "Root=1-61bd5fa4-17f8006279006770433cc1ec" }, "origin": "67.83.127.85", "url": "http://httpbin.org/get" }