[Social-discuss] Salmon notifications sometimes return error 400

[Michael Vogel]

Hi!

I'm working at the OStatus implementation of Friendica. This
implementation was improved very much in the last versions. But still
there are some problems.

We are sending salmon notifications when we are commenting in a thread.
Mostly they are accepted, but sometimes - especially with quitter.se -
our notifications are answered with the HTTP error 400.

It seems as if this error is generated when the server thinks that we
aren't mention a user on that server or maybe when we are referring to a
post that isn't available on that server.

Is there a difference if we mention a user with an SSL or an non-SSL
link? Or is is normalized before the check?

Can someone tell me how the checks work?

Thanks!

Michael