Is it possible to add a URL param to redirect with SAMLRequest?

[Ian Hardy]

Hi,

I'm wondering if it's possible to append a custom URL parameter to the SAML
request. I'm using redirect binding. When I create request, I send people
to the session initiator like so:

https://my.sp.tld/Shibboleth.sso/Login?entityID={idpid}&target={returnhere}

They're redirected to

https://my.idp.tld/saml?SAMLRequest={SAMLRequest}

With the IdP I'm working with, it would be useful If I could add another
url parameter in addition to the SAMLRequest. For example:

https://my.idp.tld/saml?SAMLRequest={SAMLRequest}&customparam=custom

and it would be especially useful if I could specify that custom parameter
on the session initiator by adding it alongside the entityID and target
params that are already there. Wondering if this seems possible or if
anyone's tried it before.

Thanks for considering,

Ian
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