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Logout (LogoutRequest) process flow

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Logout (LogoutRequest) process flow

During logout, the instance issues the SAML 2.0 LogoutRequest service call to the IdP.

This service logs the user out and then redirects back to the specified logout URL.
Figure 1. SAML 2 Logout

User Clicks the Logout Button

The user clicks the Logout button and the instance executes the logout script.

LogoutRequest issued

The logout script constructs a SAML 2.0 LogoutRequest and posts it to the preconfigured SingleLogoutRequest SAML 2.0 service at the IdP. The IdP deflates the request and then base64 encodes it. An example LogoutRequest looks like this:
<saml2p:LogoutRequestxmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol"  ID="21B78E9C6C8ECF16F01E4A0F15AB2D46"  IssueInstant="2010-04-28T21:36:11.230Z"  Version="2.0"><saml2:Issuer xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">
	</saml2:Issuer><saml2:NameID xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"          Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress"          NameQualifier=""          SPNameQualifier=""></saml2:NameID><saml2p:SessionIndex>s211b2f811485b2a1d2cc4db2b271933c286771104

User Logs Out

The user logs out of the IdP. The IdP redirects back to the instance, which in turns redirects back to the IdP since the user is not logged in.