I am not clear what you mean by "RAWdata". Which mime-type is this?
In general, Apigee acts as a pass-through proxy. If you use Apigee to proxy a request that has a set of headers and a body, Apigee will pass it through to the upstream / target. "Pass through" is not quite accurate. In fact with a layer-7 Proxy like Apigee, there is an inbound request (client to Apigee) and there is a separate outbound request (Apigee to target). They are distinct requests. So it is not the case, strictly speaking, that Apigee "passes the inbound request through to the target". In fact Apigee "mirrors" or "copies" the request, and sends a request with the same headers, verb, path, and body to the target. This happens assuming the request itself is valid - that the URL path is within limits, that the header values are valid (Well formed) and so on.
Apigee may validate the request, but something like "Simple POST request with any content-type and a message body is passed to the target endpoint to get the response", is what Apigee does by default. You don't have to do anything special to accomplish this.
What have you tried? (Show your proxy configuration) What problems are you experiencing? What behavior are you observing? (Show your trace session)
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