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I compiled this program with Microsoft .NET 4.5.1 and it works fine with Microsoft .NET. However, when I run this program with Mono it works, but send incorrect User-Agent header. Instead of sending "MLK Android Phone 1.1.9" it sends "MLK,Android,Phone,1.1.9".
static void Main(string args)
using (var http = new HttpClient())
http.DefaultRequestHeaders.Add("User-Agent", "MLK Android Phone 1.1.9");
http.GetAsync(new Uri("http://localhost:8888", UriKind.Absolute)).Wait();
If it help, when I change the header name to User-Aaaaaagent then the spaces aren't replaced with commas in the header value.
Fixed in master and Mono 4.2