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I have a legacy .NET 4.8 framework project.

I have tried to get these headers:

Accept-Encoding
CacheControl

sent to my endpoint.

But looking with Fiddler, they are not sent, even if I explicitly set them. Any idea why?

HttpRequestMessage TmpRequest = new HttpRequestMessage(HttpMethod.Get, url);

TmpRequest.Headers.UserAgent.ParseAdd("Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:145.0) Gecko/20100101 Firefox/145.0");

TmpRequest.Headers.AcceptEncoding.ParseAdd("gzip");
TmpRequest.Headers.AcceptEncoding.ParseAdd("deflate");
TmpRequest.Headers.AcceptEncoding.ParseAdd("br");

TmpRequest.Headers.CacheControl = new CacheControlHeaderValue
                    {
                        NoCache = true
                    };

HttpResponseMessage TmpResponse = await TmpClient.SendAsync(TmpRequest);

Only the UserAgent is sent as header...

But why not Accept-Encoding and CacheControl ?

Here is what fiddler shows :

User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:145.0) Gecko/20100101 Firefox/145.0
Improve this question
3
  • Then I inspect the TmpRequest just before TmpRequest like this TmpRequest.ToString() i see the following : Cache-Control: no-cache Accept-Encoding: gzip, deflate, br User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:145.0) Gecko/20100101 Firefox/145.0 So the values are there but not sent. Very strange... Commented Nov 23 at 15:08
  • Do note that you can edit your question and add it the information that you believe is relevant Commented Nov 24 at 19:30
  • I just tried your code, in a .NET 4.8 console app with fiddler and it worked fine (where url=localhost:8888). The only line that could be different would be HttpClient TmpClient = new HttpClient(); Does Fiddler startup as the system proxy? Is Options->Connections->Act as system proxy on startup checked? Commented 2 days ago
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