在Silverlight中请求GZipped内容

Question

I'm having trouble to request Gzipped content with Silverlight 5. To reduce used bandwidth I want to use gzip for the content that's requested from our webservice, but unfortunately this does not work.

I'm using the Client Stack and send a HttpWebRequest. I tried to set the Accept-Encoding header, but it tells me that I'm not allowed to change this directly - and there's no other property for it!

So how can I send a custom Accept-Encoding header?

This is the code I have in my App-Constructor:

WebRequest.RegisterPrefix("http://", WebRequestCreator.ClientHttp);
WebRequest.RegisterPrefix("https://", WebRequestCreator.ClientHttp);

This is how I create the request and set the header:

var webRequest = (HttpWebRequest)WebRequest.Create(requestUri);
webRequest.Headers["Accept-Encoding"] = "gzip, deflate";

This is the exception:

{System.ArgumentException: The 'Accept-Encoding' header cannot be modified directly.
Parameter name: name
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at MyClass}

Answer 1

不幸的答案是：如果要gzip，请不要使用客户端堆栈（浏览器堆栈已经为您处理了）

Answer 2

In this case I'm fortunate enough to control the service side as well as the client side. What I have done now is adding an additional custom header that will essentially override the Accept-Encoding header. I call it "Accept-Encoding-Override". When my service encounters this header it'll compress the the content no matter what's in the Accept-Encoding header. On the client silverlight side I check the Content-Encoding header in the response and if necessary unzip it using SharpZipLib (DotNetZip did not work).

I still mark dotMorten as his response is the actually answer to my question. There's no way to set the header when using ClientStack.