Mercure Failed to send an update. HTTP/2 405 returned for "https://example.com/.well-known/mercure".

[sandbava]

Symfony version(s) affected

7.2.*

Description

I follow the documentation for Mercure https://symfony.com/doc/current/mercure.html
I am using using the Docker integration with the Symfony Local Web Server.
and $hub->publish($update); provoke an error 500 :
[RuntimeException] Failed to send an update.
ClientException HTTP/2 405 returned for "https://example.com/.well-known/mercure".

How to reproduce

Create a new symfony webapp project, follow the Mercure documentation until Basic Usage/Publishing

Possible Solution

No response

Additional Context

No response

[sandbava]

Same with version 7.0.x