SAML Decoder Question w.r.t IdP

[Joshua Brodie]

I am experimenting with developing a login handler - pure
experimentation for pure pleasure at this stage.

Question:

- After request submitted by an SP, which IdP cookie stores the SAML
request send from the SP?

What can I do to clear the above IdP's record of the SAML request -
i.,e. to force:

WARN [edu.internet2.middleware.shibboleth.idp.profile.saml2.SSOProfileHandler:336]
- Error decoding authentication request message
org.opensaml.ws.message.decoder.MessageDecodingException: No
SAMLRequest or SAMLResponse query path parameter, invalid SAML 2 HTTP
Redirect message
	at org.opensaml.saml2.binding.decoding.HTTPRedirectDeflateDecoder.doDecode(HTTPRedirectDeflateDecoder.java:97)