[keycloak-user] Occasionally Bad Requests

[Nils Christian Ehmke]

Hi,

We are having an issue with Keycloak in our application. The user gets 
occasionally a "bad request" error. This can be easily forced by opening 
multiple tabs to the application which load concurrently (so this might 
be an issue with concurrent requests). If the error occurs, the browser 
stops at an url of the form .../sso/login?state=...

Some details about our application that might be important:
* We use the Spring Boot Keycloak adapter multiple times in the same JVM 
as we start multiple embedded Tomcats.
* The error seems to occur only when using a link from one of these 
embedded Tomcats to another.
* The application is behind an Apache which handles SSL and acts as a 
(reverse) proxy.

Can you give us any hints and possible reasons? Or maybe a hint how to 
approach the problem?

Thanks and best regards,

   Nils