启动后但上载请求有效负载之前，如何拦截（服务器端）非流HTTP WCF请求

Question

I have WCF clients that are making some large HTTP Post requests from some potentially slow connections. I want to do some server side work on those requests as soon as I know the URI and QueryString of the request but before the payload actually finishes uploading. The requests are non-streaming.

My understanding is that the AfterReceiveRequest method of IDispatchMessageInspector gets called after the request has been fully received so that doesn't work.

Is this even possible in WCF?

Answer 1

You are right that the message would have been received, but you can still operate or replace the the message in the AfterReceiveRequest.

AfterReceiveRequest is invoked by the dispatcher when a message has been received, processed by the channel stack and assigned to a service, but before it is deserialized and dispatched to an operation. If the incoming message was encrypted, the message is already decrypted when it reaches the message inspector. The method gets the request message passed as a reference parameter, which allows the message to be inspected, manipulated or replaced as required .

It seems you'd prefer to do something server side, but you can also implement the IClientMessageInspector.BeforeSendRequest to inspect and operate on the message just before it is sent out to the server.

BeforeSendRequest is invoked when the message has been composed either by the client application or by the operation formatter. As with the dispatcher message inspectors, the message can just be inspected or entirely replaced.

MSDN Documentation