title: Ignore token expiration on keycloak spring security adapter
body: <p>Considering the scenario:</p>
  <ol>
  <li>API Gateway validates an JWT token issued by keycloak. It does all the validations, expiration date included.</li>
  <li>The token is then forwarded to the target application.</li>
  <li>That target application validates the token again, using the keycloak spring security adapter.</li>
  <li>The application can process the request and eventually forward this token to another internal services, that will do the same validation.</li>
  </ol>
  <p>However during the lifespan of this request the token can expire.</p>
  <p>My questions are:</p>
  <ol>
  <li>Would it be safe to, given the token was alredy validated on the API gateway, to ignore the token expiration date?</li>
  <li>If the answer to 1 is yes, is there a way to configure the spring security adapter to ignore the expiration date?</li>
  <li>If the answer to 1 is no, is there a standard way to handle this scenario where the token expires during the lifespan of a request?</li>
  </ol>