Add custom header in HttpWebRequest

You use the Headers property with a string index:

request.Headers["X-My-Custom-Header"] = "the-value";

According to MSDN, this has been available since:

  • Universal Windows Platform 4.5
  • .NET Framework 1.1
  • Portable Class Library
  • Silverlight 2.0
  • Windows Phone Silverlight 7.0
  • Windows Phone 8.1

https://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.headers(v=vs.110).aspx

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