Frequent 503 errors when pushing from Symfony to Mercure

[lostfocus]

We have a Symfony 4.4 project and connect to a Mercure hub within the official Docker container following this documentation: https://symfony.com/doc/4.4/mercure.html

It usually works fine, but at some point we keep getting 'HTTP/2 503' errors when trying to push updates to the Mercure hub. There's nothing I can see in the Mercure log, so what else can be done to find a reason for that error and how to make sure it doesn't happen all the time?

[dunglas]

It looks related to the default connection limits set in the Golang HTTP server: https://stackoverflow.com/a/46740998/1352334

A solution is to provide new configuration options to let the user change these values.

[dominicbvm]

Could this also be a reason that we get an Idle timeout reached error as well? Seems to work well for maybe around a day or so and then needs to be restarted. Not seeing any errors in the logs.

Message: Idle timeout reached for "https://[my-mercure-host]:3000/.well-known/mercure".

0 /app/vendor/symfony/http-client/Response/CurlResponse.php(147): Symfony\Component\HttpClient\Chunk\ErrorChunk->isFirst()

1 /app/vendor/symfony/http-client/Response/ResponseTrait.php(102): Symfony\Component\HttpClient\Response\CurlResponse::Symfony\Component\HttpClient\Response{closure}(Object(Symfony\Component\HttpClient\Response\CurlResponse))

2 /app/vendor/symfony/http-client/Response/CurlResponse.php(205): Symfony\Component\HttpClient\Response\CurlResponse->doGetContent(true)

3 /app/vendor/symfony/mercure/src/Publisher.php(61): Symfony\Component\HttpClient\Response\CurlResponse->getContent()

[phakpoom]

How can i fix this problem for now ?

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[BelphegorPrime]

@dunglas can we expect this issue to be resolved in the near future or does it look more like a 2021 or 2022 deadline?

[dunglas]

Does this problem still occurs with the latest version?

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[indjeto]

I still experience the issue with the latest version. I'm using mercure_0.12.2_Linux_x86_64.tar.gz on Ubuntu 20.04.3 LTS. It's very annoying. @dunglas is it going to be fixed or need to setup something?

[dunglas]

It's most likely a configuration problem.

Can you open a new issue and copy your config as well as the logs and the errors you get please?