René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"HTTP Upgrade IncomingMessage does not parse body","articleBody":"### Version\n\n22.15.0\n\n### Platform\n\n```text\nLinux\n```\n\n### Subsystem\n\nhttp\n\n### What steps will reproduce the bug?\n\n```js\n'use strict';\n\nconst { createServer, request } = require('http');\n\ncreateServer((req, res) =\u003e {\n  res.writeHead(200).end();\n}).on('upgrade', (req, reqSocket, head) =\u003e {\n  console.log('Server Upgrade', req.headers);\n  let buf = '';\n  req.on('data', (str) =\u003e buf += str);\n  req.on('close', () =\u003e {\n    console.log(\n      'Request close',\n      'data', JSON.stringify(buf.trim()),\n      'head', Buffer.from(head)\n    );\n  });\n  req.setEncoding('utf8');\n}).listen(0, '127.0.0.1', function() {\n  const req = request({\n    host: '127.0.0.1',\n    port: this.address().port,\n    method: 'POST',\n    path: '/foo',\n    headers: {\n      Connection: 'Upgrade',\n      Upgrade: 'db',\n    },\n  });\n  req.on('upgrade', (res, socket, head) =\u003e {\n    console.log(\n      'Client Upgrade',\n      'status', res.statusCode,\n      'head', Buffer.from(head)\n    );\n  });\n  setTimeout(() =\u003e {\n    req.write('2');\n    setTimeout(() =\u003e req.end(), 1000);\n  }, 1000);\n});\n```\n\nOutput:\n```\nServer Upgrade {                                                                                                                                                                                                   \n  connection: 'Upgrade',                                                                                                                                                                                           \n  upgrade: 'db',                                                                                                                                                                                                   \n  host: '127.0.0.1:39511',                                                                                                                                                                                         \n  'transfer-encoding': 'chunked'                                                                                                                                                                                   \n}                                                                                                                                                                                                                  \nRequest close data \"\" head \u003cBuffer 31 0d 0a 32 0d 0a\u003e\n```\n\n### How often does it reproduce? Is there a required condition?\n\nReproduces every time.\n\n### What is the expected behavior? Why is that the expected behavior?\n\nThe expected behavior is to have node parse the body like it normally would.\n\n### What do you see instead?\n\nNode ignores the content or potentially puts some of it (unparsed -- especially evident in the case of a chunked encoded body) in the `head` argument passed to the `'upgrade'` event.\n\n### Additional information\n\n_No response_","author":{"url":"https://github.com/mscdex","@type":"Person","name":"mscdex"},"datePublished":"2025-05-19T17:06:04.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/58394/node/issues/58394"}