text: // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  'use strict';
  const common = require('../common');
  const assert = require('assert');
  const http = require('http');
  
  const server = http.createServer(common.mustNotCall());
  
  server.on('connect', common.mustCall((req, socket, firstBodyChunk) => {
    assert.strictEqual(req.method, 'CONNECT');
    assert.strictEqual(req.url, 'google.com:443');
  
    // Make sure this socket has detached.
    assert.strictEqual(socket.listenerCount('close'), 0);
    assert.strictEqual(socket.listenerCount('drain'), 0);
    assert.strictEqual(socket.listenerCount('data'), 0);
    assert.strictEqual(socket.listenerCount('end'), 1);
    assert.strictEqual(socket.listenerCount('error'), 0);
    assert.strictEqual(socket.listenerCount('timeout'), 0);
  
    socket.write('HTTP/1.1 200 Connection established\r\n\r\n');
  
    let data = firstBodyChunk.toString();
    socket.on('data', (buf) => {
      data += buf.toString();
    });
  
    socket.on('end', common.mustCall(() => {
      socket.end(data);
    }));
  }));
  
  server.listen(0, common.mustCall(() => {
    const req = http.request({
      port: server.address().port,
      method: 'CONNECT',
      path: 'google.com:443',
      timeout: 20000
    }, common.mustNotCall());
  
    req.on('socket', common.mustCall((socket) => {
      assert.strictEqual(socket._httpMessage, req);
    }));
  
    req.on('close', common.mustCall());
  
    req.on('connect', common.mustCall((res, socket, firstBodyChunk) => {
      // Make sure this request got removed from the pool.
      const name = `localhost:${server.address().port}`;
      assert(!http.globalAgent.sockets.hasOwnProperty(name));
      assert(!http.globalAgent.requests.hasOwnProperty(name));
  
      // Make sure this socket has detached.
      assert(!socket.ondata);
      assert(!socket.onend);
      assert.strictEqual(socket._httpMessage, null);
      assert.strictEqual(socket.listenerCount('connect'), 0);
      assert.strictEqual(socket.listenerCount('data'), 0);
      assert.strictEqual(socket.listenerCount('drain'), 0);
      assert.strictEqual(socket.listenerCount('end'), 1);
      assert.strictEqual(socket.listenerCount('free'), 0);
      assert.strictEqual(socket.listenerCount('close'), 0);
      assert.strictEqual(socket.listenerCount('error'), 0);
      assert.strictEqual(socket.listenerCount('agentRemove'), 0);
      assert.strictEqual(socket.listenerCount('timeout'), 0);
  
      let data = firstBodyChunk.toString();
      socket.on('data', (buf) => {
        data += buf.toString();
      });
  
      socket.on('end', common.mustCall(() => {
        assert.strictEqual(data, 'HeadBody');
        server.close();
      }));
  
      socket.write('Body');
      socket.end();
    }));
  
    // It is legal for the client to send some data intended for the server
    // before the "200 Connection established" (or any other success or
    // error code) is received.
    req.write('Head');
    req.end();
  }));
  