APIGEE X headers not available in the request/response flows inside the proxy.

[darpanjain420]

I am trying to use x-apigee-message-id to be explicitly set in a header and sent to the backend target server api.
But when i use Assign message policy in the preflow of the proxy endpoint with "Ref = request.header.x-apigee-message-id" , I get empty value and in debug I can see none of the headers which were listed in the node "request received by client".
Kindly suggest as to what I may be missing. I just want to use one of the headers which I can see in the request node.

[ganadurai · Accepted solution]

Checkout this docs page. https://docs.apigee.com/migration-to-x/compare-apigee-edge-to-apigee-x#unsupported-features

Headers prefixed with "X-Apigee-" are not supported in Apigee X and are stripped from requests and responses before sending to targets and clients.