Error Endpoint mismatch from fronting Tomcat with Apache

Hi,

I have a web app running in Tomcat which is behind Apache. I set in Apache configuration that any requests to "http://xxx.cbu.uib.no/yyy" will be forwarded to "http://test.abcd.uib.no:7070" which is my web app.

The problem is: when IDP using HTTP-POST sends response back to the wep app, this error is thrown

ERROR o.o.c.b.d.BaseSAMLMessageDecoder - SAML message intended destination endpoint 'http://xxx.cbu.uib.no/yyy/saml/SSO/alias/defaultAlias' did not match the recipient endpoint 'http://test.abcd.uib.no:7070//saml/SSO/alias/defaultAlias'

I think it is because my setup (Tomcat is behind Apache).

I would like to ask if anyone has the same setup and how to get rid of this problem?

Best,
patch