output.md

server

GET /echo HTTP/1.1
lower-case: 1
UPPER-CASE: 2
Mixed-Case: 3
Host: 127.0.0.1:1337
Custom-Header: 4
Connection: keep-alive

test

Headers are sent as-is, keeping case untouched

request.js

var http = require('http');

var req = http.request({
  hostname: '127.0.0.1',
  port: 1337,
  method: 'GET',
  path: '/echo',
  headers: {
    'lower-case': 1,
    'UPPER-CASE': 2,
    'Mixed-Case': 3
  }
});

req.setHeader('Custom-Header', 4);

req.write('test');

req.end();

server.js

var net = require('net');

var server = net.createServer(function (socket) {
  socket.pipe(process.stdout);
});

server.listen(1337, '127.0.0.1');