Purpose of attaching a certificate to the HttpWebRequest

Question

What is the benefit or use of adding a client certificate to the HttpWebRequest ?

To be more specific,

Request.ClientCertificates.Add(someCertificate); // what is it's use ?

where Request is the HttpWebRequest object.

Answer 1

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

please read the remarks section especially on this page.

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