Target backend server does not return response for asynchronous request

I have a order submission request made from client using proxy URL and for this request, the target backend server does not send any response to APIGEE.

APIGEE receives 504 Gateway timeout error and the connection closes.

How will APIGEE know if it is actual 504 fault or the request has been successfully sent to backend and is timing out because it is not receiving any response ?

Note : this is a asynchronous request made to the backend

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There are some pattern you can follow to achieve asynchronous calls in apigee.

I suggest you to read some community posts to know more about it

https://community.apigee.com/questions/4886/asynchronous-messages-how-do-i-handle-asynchronous.html

https://community.apigee.com/articles/2340/asynchronous-http-requests-in-an-api-proxy.html