HttpClient在POST期间未传递内容

Question

I'm doing a simple call using HttpClient . The problem is that it doesn't seem to send the content I provide. The server gives me an error for this and when I look at the request with Fiddler it doesn't show the content as it should:

HttpContent content = new FormUrlEncodedContent(
                new List<KeyValuePair<string, string>> { 
                    new KeyValuePair<string, string>("key1", "value1"),
                    new KeyValuePair<string,string>("key2","value2"),
                    new KeyValuePair<string,string>("key3","value3"),
                    new KeyValuePair<string,string>("key4", "value4"),
                    new KeyValuePair<string, string>("key5", "value5"),
                    new KeyValuePair<string, string>("key6", "value6")
                });
content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");
content.Headers.ContentType.CharSet = "UTF-8";
HttpResponseMessage resposne = await client.PostAsync(new Uri("my_url"), content);

Any suggestions on what can be wrong?

Answer 1

It's possible that UserAgent is the issue. HttpClient on MSDN

By default, no user-agent header is sent with the HTTP request to the web service by the HttpClient object. Some HTTP servers, including some Microsoft web servers, require that a user-agent header be included with the HTTP request sent from the client. The user-agent header is used by the HTTP server to determine how to format some HTTP pages so they render better on the client for different web browsers and form factors (mobile phones, for example). Some HTTP servers return an error if no user-agent header is present on the client request. We need to add a user-agent header to avoid these errors using classes in the Windows.Web.Http.Headers namespace. We add this header to the HttpClient.DefaultRequestHeaders property.