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A complete solution with comprehensive error handling and logging is provided below.The subrequest target location defined in line 2 looks very much like our original All of the configuration to construct the token introspection request is contained within the /_oauth2_send_request location.We can control for how long cached responses are used, to mitigate the risk of accepting an expired or recently revoked access token.For example, if an API client typically makes a burst of several API calls over a short period of time, then a cache validity of 10 seconds might be sufficient to provide a measurable improvement in user experience.The processes for issuing, presenting, and validating an OAuth 2.0 authentication flow often rely on several related standards.At the time of writing there are eight OAuth 2.0 standards, and access tokens are a case in point, as the OAuth 2.0 core specification (RFC 6749) does not specify a format for access tokens.OAuth 2.0 token introspection is provided by the Id P at a JSON/REST endpoint, and so the standard response is a JSON body with HTTP status NGINX can be configured to cache a copy of the introspection response for each access token so that the next time the same access token is presented, NGINX serves the cached introspection response instead of making an API call to the Id P.

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Consider how each backend service might handle the following error conditions: module to trigger an API call to an Id P before proxying a request to the backend.

Because Id Ps cryptographically sign the JWTs they issue, JWTs can be validated “offline” without a runtime dependency on the Id P.

Typically, a JWT also includes an expiry date which can also be checked.

For NGINX Plus, we also show how the cache can be distributed across a cluster of NGINX Plus instances, by updating the key‑value store with the Java Script module, as introduced in .

Except where noted, the information in this blog applies to both NGINX Open Source and NGINX Plus.

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