fix: check Destination url against the request URL or the ACS url #577
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…stead of just the ACS url
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The SAML spec requires the Destination in the SAML Response matches the URL that the response is submitted to. Previous logic approximated this by checking against the ACS URL, but that may be different than the current URL if there are query params.
This PR updates the matching logic to us the request URL or the ACS URL. This is done to prevent any breakages if clients were depending on the ACS URL matching.
Closes #525.