Add static/custom attribute with ACS Url

Tom Scavo trscavo at
Wed Feb 7 15:28:14 EST 2018

On Wed, Feb 7, 2018 at 1:40 PM, Santu Ghosh <mon.snahasish at> wrote:
> I have an SP with entityId
> More than 4 IdP are connected with my SP. Among them 3 using SP initiated
> and one used IdP initiated authentication. Now the IDP who use IdP initiated
> flow try to execute SP's ACE URL i,e, in their
> end.

Oops, apparently you typed your entityID twice.

> After executing above mentioned url , user of that Idp are redirected to
> error page. Because when SP received the requested url in ACS location, SP
> is unable to distinguished IDP's identity. As a result they are redirected
> to error page.

The IdP's identity is in the SAML assertion.

> Is it possible to add an custom/static parameter with the ACS URL ?

Have you considered using RelayState? In an SP-initiated flow, the SP
determines the RelayState, but in an IdP-initiated flow, the IdP can
add whatever RelayState value the SP will understand (presumably by
prior agreement).


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