public void HttpHeadersAddTest()
{
var HttpHeaders = new HttpHeaders();
Assert.AreEqual("[]", HttpHeaders.AsEnumerable<HttpHeader>().ToJsonString());
HttpHeaders.Add("Content-Type", "text/html");
HttpHeaders.Set("Content-Type", "text/plain");
HttpHeaders.Set("cOntEnt-type", "text/plain");
Assert.AreEqual(1, HttpHeaders.Count());
Assert.AreEqual("cOntEnt-type: text/plain", String.Join("|", HttpHeaders.AsEnumerable()));
}