Custom out-of-band POST value from SP during SSO request.

I need to submit custom hidden form value during SP-initiated SSO to IdP. The value is dynamic, and only needed for SSO, not for SLO. What’s the easiest way to do that? I have looked at HttpPostForm class, but I don’t see an easy way of adding new hidden variable to the POST. Would appreciate code example as well.


Hi Eric,
This is possible by implementing the IHttpPostForm interface as described in the IHttpPostForm and HttpPostForm sections of the Developer Guide.
However, please contact mentioning your forum post.
We’d like to fully understand your requirements and potentially make available a beta release that simplifies the implementation.