Exam Identity-and-Access-Management-Architect Topic 3 Question 16 Discussion

Explanation
The HTTP parameter that should be used when submitting a SAML request to the IdP to ensure the user is returned to the intended resource after authentication is RelayState. RelayState is an optional parameter that can be used to preserve some state information across the SSO process. For example, RelayState can be used to specify the URL of the resource that the user originally requested on the SP before being redirected to the IdP for authentication. After the IdP validates the user's identity and sends back a SAML response, it also sends back the RelayState parameter with the same value as it received from the SP. The SP then uses the RelayState value to redirect the user to the intended resource after validating the SAML response. The other options are not valid HTTP parameters for this purpose. RedirectURL, DisplayState, and StartURL are not standard SAML parameters and they are not supported by Salesforce as SP or IdP. References: [SAML SSO Flows], [RelayState Parameter]