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Created attachment 12934 [details]
Changing the HttpClient.DefaultRequestHeader.Host or a HttpRequestMessage.Headers.Host has no effect.
The Host header is always taken from the request URL.
Using Windows (not on mono), the expected output is displayed:
Using DefaultRequestHeaders.Host: default-request-header-host
Using HttpRequestMessage.Headers.Host: http-request-message-host
Using Ubuntu 14.04 running Mono 4.0.2 and 4.2.0:
Using DefaultRequestHeaders.Host: localhost:5000
Using HttpRequestMessage.Headers.Host: localhost:5000
Steps to compile: mcs Program.cs /r:System.Net.Http
Steps to run: mono Program.exe
note: the HttpListener server included is for testing; it is not part of the problem
The fix is to explicitly set HttpWebRequest's Host field in HttpClientHandler.CreateWebRequest, as HttpWebRequest ignores the Host field in the list of headers.
Pull request at https://github.com/mono/mono/pull/2065
Fixed in master/5ec3345b799a0f29d6f7dea783ff25ca4f925c62 and mono-4.2/d983aa605a684d923d2104bd08fce0c8e2c53c6c