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HTTP2: Calling res.end after res.writeHead(204) cause an error #21740

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RidgeA opened this issue Jul 10, 2018 · 2 comments
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HTTP2: Calling res.end after res.writeHead(204) cause an error #21740

RidgeA opened this issue Jul 10, 2018 · 2 comments
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http2 Issues or PRs related to the http2 subsystem.

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@RidgeA
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RidgeA commented Jul 10, 2018

  • Version: v10.6.0
  • Platform: Linux localhost.localdomain 4.17.3-200.fc28.x86_64 deps: update openssl to 1.0.1j #1 SMP Tue Jun 26 14:17:07 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux (Fedora 28)
  • Subsystem: http2

Hi!

I'm playing around with http2 module and server push and faced with a strange error.

Invoking of res.end() method after res.writeHeader(204) causes error:

internal/http2/compat.js:377
  this.sendTrailers(this[kResponse][kTrailers]);
                                   ^

TypeError: Cannot read property 'Symbol(trailers)' of undefined
    at ServerHttp2Stream.onStreamTrailersReady (internal/http2/compat.js:377:36)
    at ServerHttp2Stream.emit (events.js:182:13)
    at Http2Stream.onStreamTrailers [as ontrailers] (internal/http2/core.js:311:15)

Code to reproduce:

"use strict";

const http2 = require('http2');
const fs = require('fs');
const cert = {
  key: fs.readFileSync('./cert/key.pem'),
  cert: fs.readFileSync('./cert/cert.pem')
};
const html =
`
<!doctype html>
<head>
    <title>HTTP/2 Test</title>
    <link rel="stylesheet" href="/styles.css" type="text/css">
    <script src="/bundle.js" async></script>
</head>
<body>
<h1>Hello</h1>
</body>
</html>
`;

http2.createSecureServer(cert, (req, res) => {

  const {url} = req;

  if (['/index.html', '/'].includes(url)) {
    res.writeHead(200, {'content-type':'text/html'});
    res.end(html);
  } else {
    res.writeHead(204);
    res.end();
  }

}).listen(8443, err => {
  if (!err) {
    console.log(`Server started at ${8443}.`)
  }
});

After digging into the issue, I found out that if we set 204, 205 and 304 status codes the stream are closed automatically - see https:/nodejs/node/blob/master/lib/internal/http2/core.js#L2266 and https:/nodejs/node/blob/master/lib/internal/http2/core.js#L2281

Calling of req.end method after that causes an error (see above).

According to the documentation req.end() MUST be called for each request: https://nodejs.org/api/http2.html#http2_response_end_data_encoding_callback
but it is impossible due to closing the stream caused by calling writeHeader method.

I believe, in order to keep backward compatibility with http/https modules, the res.end method shouldn't throw an error in such case.
@RidgeA RidgeA changed the title Http2: Calling res.end after res.writeHead(204) cause an error. HTTP2: Calling res.end after res.writeHead(204) cause an error. Jul 10, 2018
@RidgeA RidgeA changed the title HTTP2: Calling res.end after res.writeHead(204) cause an error. HTTP2: Calling res.end after res.writeHead(204) cause an error Jul 10, 2018
@addaleax addaleax added the http2 Issues or PRs related to the http2 subsystem. label Jul 10, 2018
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@RidgeA RidgeA mentioned this issue Jul 11, 2018
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@RidgeA
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RidgeA commented Jul 11, 2018

PR to fix this issue - #21764

targos pushed a commit that referenced this issue Jul 16, 2018
@RidgeA @targos
http2: remove waitTrailers listener after closing a stream
238ef58 
When `writeHeader` of `Http2ServerResponse` instance are called with
204, 205 and 304 status codes an underlying stream closes.
If call `end` method after sending any of these status codes it will
cause an error `TypeError: Cannot read property 'Symbol(trailers)' of
undefined` because a reference to `Http2ServerResponse` instance
associated with Http2Stream already was deleted.
The closing of stream causes emitting `waitTrailers` event and, when
this event handles inside `onStreamTrailerReady` handler, there is
no reference to Http2ServerResponse instance.

Fixes: #21740
PR-URL: #21764
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>
kjin pushed a commit to kjin/node that referenced this issue Aug 23, 2018
@RidgeA @kjin
http2: remove waitTrailers listener after closing a stream
98e81c0 
When `writeHeader` of `Http2ServerResponse` instance are called with
204, 205 and 304 status codes an underlying stream closes.
If call `end` method after sending any of these status codes it will
cause an error `TypeError: Cannot read property 'Symbol(trailers)' of
undefined` because a reference to `Http2ServerResponse` instance
associated with Http2Stream already was deleted.
The closing of stream causes emitting `waitTrailers` event and, when
this event handles inside `onStreamTrailerReady` handler, there is
no reference to Http2ServerResponse instance.

Fixes: nodejs#21740
PR-URL: nodejs#21764
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>
kjin pushed a commit to kjin/node that referenced this issue Sep 25, 2018
@RidgeA @kjin
http2: remove waitTrailers listener after closing a stream
1a15129 
When `writeHeader` of `Http2ServerResponse` instance are called with
204, 205 and 304 status codes an underlying stream closes.
If call `end` method after sending any of these status codes it will
cause an error `TypeError: Cannot read property 'Symbol(trailers)' of
undefined` because a reference to `Http2ServerResponse` instance
associated with Http2Stream already was deleted.
The closing of stream causes emitting `waitTrailers` event and, when
this event handles inside `onStreamTrailerReady` handler, there is
no reference to Http2ServerResponse instance.

Fixes: nodejs#21740
PR-URL: nodejs#21764
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>
kjin pushed a commit to kjin/node that referenced this issue Oct 16, 2018
@RidgeA @kjin
http2: remove waitTrailers listener after closing a stream
9a0d117 
When `writeHeader` of `Http2ServerResponse` instance are called with
204, 205 and 304 status codes an underlying stream closes.
If call `end` method after sending any of these status codes it will
cause an error `TypeError: Cannot read property 'Symbol(trailers)' of
undefined` because a reference to `Http2ServerResponse` instance
associated with Http2Stream already was deleted.
The closing of stream causes emitting `waitTrailers` event and, when
this event handles inside `onStreamTrailerReady` handler, there is
no reference to Http2ServerResponse instance.

Fixes: nodejs#21740
PR-URL: nodejs#21764
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>
BethGriggs pushed a commit that referenced this issue Oct 17, 2018
@RidgeA @BethGriggs
http2: remove waitTrailers listener after closing a stream
e5175e6 
When `writeHeader` of `Http2ServerResponse` instance are called with
204, 205 and 304 status codes an underlying stream closes.
If call `end` method after sending any of these status codes it will
cause an error `TypeError: Cannot read property 'Symbol(trailers)' of
undefined` because a reference to `Http2ServerResponse` instance
associated with Http2Stream already was deleted.
The closing of stream causes emitting `waitTrailers` event and, when
this event handles inside `onStreamTrailerReady` handler, there is
no reference to Http2ServerResponse instance.

Fixes: #21740
Backport-PR-URL: #22850
PR-URL: #21764
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Anatoli Papirovski <[email protected]>
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