This is why the most common profile for SAMLResponse is POST. That, or use SAML 
Attribute Query (uncommon with SAML 2.0).

Tom.

> On Nov 14, 2017, at 8:59 AM, Fabio Martelli <[email protected]> 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
> 
> 
> -- 
> Fabio Martelli
> https://it.linkedin.com/pub/fabio-martelli/1/974/a44
> http://blog.tirasa.net/author/fabio/index.html
> 
> Tirasa - Open Source Excellence
> http://www.tirasa.net/index.html?pk_campaign=email&pk_kwd=fm
> 
> Apache Syncope PMC
> http://people.apache.org/~fmartelli/
> 
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