How To Fix /IWNGW/CM_HUB089 - Csrf token or rest client not found while getting metadata in callback

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWNGW/CM_HUB -

• Message number: 089

• Message text: Csrf token or rest client not found while getting metadata in callback

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWNGW/CM_HUB089 - Csrf token or rest client not found while getting metadata in callback ?

  The SAP error message /IWNGW/CM_HUB089 Csrf token or rest client not found while getting metadata in callback typically occurs in the context of SAP Gateway services, particularly when dealing with OData services. This error indicates that there is an issue with the CSRF (Cross-Site Request Forgery) token or the REST client configuration when trying to retrieve metadata.
  Causes:
  
  Missing CSRF Token: The CSRF token is required for certain HTTP methods (like POST, PUT, DELETE) to prevent CSRF attacks. If the token is not present or not valid, the request will fail.
  Session Issues: If the session has expired or if there are issues with the user session, the CSRF token may not be valid.
  Incorrect REST Client Configuration: The REST client may not be properly configured to handle CSRF tokens, or it may not be sending the token with the request.
  Network Issues: Sometimes, network issues can prevent the proper exchange of tokens between the client and server.
  Browser Cache: Cached data in the browser can sometimes lead to issues with token validation.
  
  Solutions:
  
  
  Obtain a Valid CSRF Token:
  
  Ensure that you are making a GET request to the OData service to retrieve the CSRF token before making any POST, PUT, or DELETE requests.
  The CSRF token can usually be obtained by sending a GET request to the service URL, and it should be included in the response headers.
  
  
  
  Check Session Validity:
  
  Ensure that the user session is active and has not expired. If it has expired, re-authenticate the user.
  
  
  
  Configure REST Client Properly:
  
  If you are using a REST client (like Postman or a custom application), ensure that it is configured to handle CSRF tokens correctly. This includes sending the token in the headers of subsequent requests.
  
  
  
  Clear Browser Cache:
  
  If you are accessing the service through a web browser, try clearing the browser cache or using an incognito window to avoid issues with cached data.
  
  
  
  Check Network Configuration:
  
  Ensure that there are no network issues that could be affecting the communication between the client and the SAP Gateway.
  
  
  
  Debugging:
  
  Use tools like Fiddler or browser developer tools to inspect the network requests and responses. Check if the CSRF token is being sent and received correctly.
  
  
  
  Related Information:
  
  CSRF Token Handling: In SAP Gateway, the CSRF token is typically managed automatically by the framework, but it is essential to ensure that your client application adheres to the expected flow.
  SAP Notes: Check for any relevant SAP Notes or documentation that may address specific issues related to CSRF tokens and OData services.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the error and successfully retrieve metadata from the SAP Gateway service.