http: refactor headersTimeout and requestTimeout logic

PR-URL: https://github.com/nodejs/node/pull/41263
Fixes: https://github.com/nodejs/node/issues/33440
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

test/parallel/test-http-server-headers-timeout-interrupted-headers.js

@@ -0,0 +1,61 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const { createServer } = require('http');
+const { connect } = require('net');
+
+// This test validates that the server returns 408
+// after server.headersTimeout if the client
+// pauses sending in the middle of a header.
+
+let sendDelayedRequestHeaders;
+const headersTimeout = common.platformTimeout(1000);
+const server = createServer({
+  headersTimeout,
+  requestTimeout: 0,
+  keepAliveTimeout: 0,
+  connectionsCheckingInterval: common.platformTimeout(250),
+}, common.mustNotCall());
+server.on('connection', common.mustCall(() => {
+  assert.strictEqual(typeof sendDelayedRequestHeaders, 'function');
+  sendDelayedRequestHeaders();
+}));
+
+assert.strictEqual(server.headersTimeout, headersTimeout);
+
+// Check that timeout event is not triggered
+server.once('timeout', common.mustNotCall((socket) => {
+  socket.destroy();
+}));
+
+server.listen(0, common.mustCall(() => {
+  const client = connect(server.address().port);
+  let response = '';
+
+  client.on('data', common.mustCall((chunk) => {
+    response += chunk.toString('utf-8');
+  }));
+
+  const errOrEnd = common.mustSucceed(function(err) {
+    assert.strictEqual(
+      response,
+      'HTTP/1.1 408 Request Timeout\r\nConnection: close\r\n\r\n'
+    );
+    server.close();
+  });
+
+  client.on('end', errOrEnd);
+  client.on('error', errOrEnd);
+
+  client.resume();
+  client.write('GET / HTTP/1.1\r\n');
+  client.write('Connection: close\r\n');
+  client.write('X-CRASH: ');
+
+  sendDelayedRequestHeaders = common.mustCall(() => {
+    setTimeout(() => {
+      client.write('1234567890\r\n\r\n');
+    }, common.platformTimeout(headersTimeout * 2)).unref();
+  });
+}));