Unable to get any response on token api - same 500 error about oauth2-bundle

[spideyfusion]

@rbaarsma Unbelievable, we posted a comment at the exact second. :D

[rbaarsma]

I dived into this issue more and eventually figured out that through the combination of the friendsofsymfony/rest-bundle and jms/serializer-bundle the Response object is being serialized, which fails. The solution was to move the /token api out of the /api namespace configured in the fos_rest.zone configuration.

I'll close this issue. Maybe my explanation will help someone else

[spideyfusion]

Looking at the exception message, it seems to originate from the jms/serializer library:

https://github.com/schmittjoh/serializer/blob/master/src/GraphNavigator/SerializationGraphNavigator.php#L158

Are you using jms/serializer or jms/serializer-bundle in your project? Something is automatically trying to serialize the PSR-7 compliant response (which is normally handled by the PSR-7 bridge that this bundle relies on).