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http: relax requirements on upgrade listener #19981

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http: relax requirements on upgrade listener #19981

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apapirovski
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The http spec does not say anything about Upgrade headers making
protocol switch mandatory but Node.js implements them as if they
are. Relax the requirements to only destroy the socket if no
upgrade listener exists on the client when status code is 101.

Refs: https://tools.ietf.org/html/rfc7230#section-6.7
Fixes: #11552

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

@apapirovski
http: relax requirements on upgrade listener
5722ae2 
The http spec does not say anything about Upgrade headers making
protocol switch mandatory but Node.js implements them as if they
are. Relax the requirements to only destroy the socket if no
upgrade listener exists on the client when status code is 101.
@apapirovski apapirovski added http Issues or PRs related to the http subsystem. semver-major PRs that contain breaking changes and should be released in the next major version. labels Apr 12, 2018
@apapirovski apapirovski added this to the 10.0.0 milestone Apr 12, 2018
@nodejs-github-bot nodejs-github-bot added the http Issues or PRs related to the http subsystem. label Apr 12, 2018
@apapirovski
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CI: https://ci.nodejs.org/job/node-test-pull-request/14229/
CitGM: https://ci.nodejs.org/view/Node.js-citgm/job/citgm-smoker/1359/

@apapirovski
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/cc @addaleax @lpinca @jasnell @nodejs/http @nodejs/tsc

@apapirovski apapirovski mentioned this pull request Apr 12, 2018
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lpinca
lpinca approved these changes Apr 12, 2018
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SGTM

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lpinca commented Apr 12, 2018 •
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Can you please run CIGTM?
Edit: Done above ignore me.

mcollina
mcollina approved these changes Apr 12, 2018
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LGTM with some minor nits.

lib/_http_server.js
@@ -530,14 +530,14 @@ function onParserExecuteCommon(server, socket, parser, state, ret, d) {
parser = null;

var eventName = req.method === 'CONNECT' ? 'connect' : 'upgrade';
if (server.listenerCount(eventName) > 0) {
if (eventName === 'upgrade' || server.listenerCount(eventName) > 0) {
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can you combine this if with the ternary before somehow? With this change we truly only need to do server.listenerCount('connect') here.

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@apapirovski apapirovski Apr 12, 2018 •
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I don't think we can combine it with the ternary since the eventName is also used inside the if clause when emitting. We could change server.listenerCount(eventName) to be server.listenerCount('connect') but I'm not sure that's truly better... I suppose a bit more descriptive?

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As I said, I'm not convinced. Removing the ternary might create code that is harder to read in the end.

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@mcollina ... are you ok with this landing without this change?

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To be clear, I would be happy to make a change but I'm not sure what it would be. I don't think there's a way to simplify this since eventName is used inside the body of the if statement.

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The only thing I can think of is reversing the condition but it doesn't change anything.

if (eventName === 'connect' && server.listenerCount('connect') === 0) {
  socket.destroy();
} else {
  // ...
}

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Yes definitely.

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This can land

lib/_http_client.js Outdated
@@ -492,6 +492,9 @@ function parserOnIncomingClient(res, shouldKeepAlive) {
}
req.res = res;

if (res.upgrade)
return 2;
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Can you please add the comment:

// Skip body and treat as Upgrade.

It was there in _http_common.js

@apapirovski apapirovski added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Apr 13, 2018
BridgeAR
BridgeAR reviewed Apr 15, 2018
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test/parallel/test-http-upgrade-server.js Outdated
test_upgrade_no_listener_ended = true;
conn.once('data', (data) => {
assert.strictEqual('string', typeof data);
assert.strictEqual('HTTP/1.1 200', data.substr(0, 12));
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Nit: please switch the arguments order to adhere to actual, expected.

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CI before landing https://ci.nodejs.org/job/node-test-pull-request/14320/

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Failure on CI is unrelated, landing.

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mcollina commented Apr 16, 2018 •
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Landed in f7fbbee

@mcollina mcollina closed this Apr 16, 2018
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@jasnell can you have a look at adding this to 10?

@apapirovski apapirovski deleted the fix-http-upgrade branch April 16, 2018 09:03
mcollina pushed a commit that referenced this pull request Apr 16, 2018
@apapirovski @mcollina
http: relax requirements on upgrade listener
f7fbbee 
The http spec does not say anything about Upgrade headers making
protocol switch mandatory but Node.js implements them as if they
are. Relax the requirements to only destroy the socket if no
upgrade listener exists on the client when status code is 101.

PR-URL: #19981
Fixes: #11552
Refs: https://tools.ietf.org/html/rfc7230#section-6.7
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
jasnell pushed a commit that referenced this pull request Apr 16, 2018
@apapirovski @jasnell
http: relax requirements on upgrade listener
33ce9a6 
The http spec does not say anything about Upgrade headers making
protocol switch mandatory but Node.js implements them as if they
are. Relax the requirements to only destroy the socket if no
upgrade listener exists on the client when status code is 101.

PR-URL: #19981
Fixes: #11552
Refs: https://tools.ietf.org/html/rfc7230#section-6.7
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Matteo Collina <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Trivikram Kamat <[email protected]>
@jancurn jancurn mentioned this pull request Sep 7, 2019
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@BridgeAR BridgeAR BridgeAR approved these changes

@lpinca lpinca lpinca approved these changes

@jasnell jasnell jasnell approved these changes

@mcollina mcollina mcollina approved these changes

@trivikr trivikr trivikr approved these changes

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node servers should handle upgrade headers gracefully
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@apapirovski @lpinca @BridgeAR @mcollina @jasnell @trivikr @nodejs-github-bot