Il 14/11/2017 21:48, Tom Poage ha scritto:
This is why the most common profile for SAMLResponse is POST. That, or use SAML 
Attribute Query (uncommon with SAML 2.0).
Hi Tom, thank you Tom for your answer.
I completely agree with you but ... the strange thing is that the *SP is using POST* *binding* to send me the AuthnRequest.

Is there a way to force CAS IdP to some useful behavior?

Thank you in advance.
BR,
F.


Tom.

On Nov 14, 2017, at 8:59 AM, Fabio Martelli <fabio.marte...@gmail.com> wrote:

Hi All, I have some trouble with SAML Authentication through mod_proxy_http.

It seems that there is a strong limitation to 8k for http response headers: in 
particular, my issue is about a redirect URL generated by CAS 5.2_RC4 [1].

As you know, this redirection requests results in a specific response header 
specification: Location.

Unfortunately, the redirection URL results to be of ~13k. For this reason, the 
Location header is truncated by mod_proxy and the SAML authentication fails 
(authentication request results in an invalid XML).

Is there a known way to address this problem or I need to implement some custom 
string compression somewhere?

I'm quite sure I cannot be alone facing with this kind of problem .... Please, 
let me have your help.

Best regards,

F.

[1] 
https://github.com/apereo/cas/blob/master/support/cas-server-support-saml-idp/src/main/java/org/apereo/cas/support/saml/web/idp/profile/AbstractSamlProfileHandlerController.java#L386-L403


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