http: improve parser error messages

Include the library-provided reason in the Error’s `message`.

Fixes: https://github.com/nodejs/node/issues/28468

PR-URL: https://github.com/nodejs/node/pull/28487
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

test/parallel/test-http-client-error-rawbytes.js

@@ -0,0 +1,32 @@
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const http = require('http');
+const net = require('net');
+
+const response = Buffer.from('HTTP/1.1 200 OK\r\n' +
+  'Content-Length: 6\r\n' +
+  'Transfer-Encoding: Chunked\r\n' +
+  '\r\n' +
+  '6\r\nfoobar' +
+  '0\r\n');
+
+const server = net.createServer(common.mustCall((conn) => {
+  conn.write(response);
+}));
+
+server.listen(0, common.mustCall(() => {
+  const req = http.get(`http://localhost:${server.address().port}/`);
+  req.end();
+  req.on('error', common.mustCall((err) => {
+    const reason = 'Content-Length can\'t be present with chunked encoding';
+    assert.strictEqual(err.message, `Parse Error: ${reason}`);
+    assert(err.bytesParsed < response.length);
+    assert(err.bytesParsed >= response.indexOf('Transfer-Encoding'));
+    assert.strictEqual(err.code, 'HPE_UNEXPECTED_CONTENT_LENGTH');
+    assert.strictEqual(err.reason, reason);
+    assert.deepStrictEqual(err.rawPacket, response);
+
+    server.close();
+  }));
+}));