http: expose headers on an http.ClientRequest "information" event

1xx intermediate status responses are allowed to have headers; so
expose the "httpVersion", "httpVersionMajor", "httpVersionMinor",
"headers", "rawHeaders", and "statusMessage" properties on this
event.

PR-URL: https://github.com/nodejs/node/pull/28459
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/test/parallel/test-http-information-headers.js b/test/parallel/test-http-information-headers.js
new file mode 100644
index 0000000000..f5cfa5078b
--- /dev/null
+++ b/test/parallel/test-http-information-headers.js
@@ -0,0 +1,64 @@
+'use strict';
+require('../common');
+const assert = require('assert');
+const http = require('http');
+const Countdown = require('../common/countdown');
+
+const test_res_body = 'other stuff!\n';
+const countdown = new Countdown(2, () => server.close());
+
+const server = http.createServer((req, res) => {
+  console.error('Server sending informational message #1...');
+  // These function calls may rewritten as necessary
+  // to call res.writeHead instead
+  res._writeRaw('HTTP/1.1 102 Processing\r\n');
+  res._writeRaw('Foo: Bar\r\n');
+  res._writeRaw('\r\n');
+  console.error('Server sending full response...');
+  res.writeHead(200, {
+    'Content-Type': 'text/plain',
+    'ABCD': '1'
+  });
+  res.end(test_res_body);
+});
+
+server.listen(0, function() {
+  const req = http.request({
+    port: this.address().port,
+    path: '/world'
+  });
+  req.end();
+  console.error('Client sending request...');
+
+  let body = '';
+
+  req.on('information', function(res) {
+    assert.strictEqual(res.httpVersion, '1.1');
+    assert.strictEqual(res.httpVersionMajor, 1);
+    assert.strictEqual(res.httpVersionMinor, 1);
+    assert.strictEqual(res.statusCode, 102,
+                       `Received ${res.statusCode}, not 102.`);
+    assert.strictEqual(res.statusMessage, 'Processing',
+                       `Received ${res.statusMessage}, not "Processing".`);
+    assert.strictEqual(res.headers.foo, 'Bar');
+    assert.strictEqual(res.rawHeaders[0], 'Foo');
+    assert.strictEqual(res.rawHeaders[1], 'Bar');
+    console.error('Client got 102 Processing...');
+    countdown.dec();
+  });
+
+  req.on('response', function(res) {
+    // Check that all 102 Processing received before full response received.
+    assert.strictEqual(countdown.remaining, 1);
+    assert.strictEqual(res.statusCode, 200,
+                       `Final status code was ${res.statusCode}, not 200.`);
+    res.setEncoding('utf8');
+    res.on('data', function(chunk) { body += chunk; });
+    res.on('end', function() {
+      console.error('Got full response.');
+      assert.strictEqual(body, test_res_body);
+      assert.ok('abcd' in res.headers);
+      countdown.dec();
+    });
+  });
+});