What is the underlying transport protocol used by XmlHttpRequest?

I am curio开发者_开发技巧us to know. Is it SOAP or plain HTTP or something else? I was checking XmlHttpRequest in wikipedia but there is no mention of it there.

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It requests an XML Document over HTTP or HTTPS.

You can see all the details in the RFC.

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As the name implies, it's HTTP: XML Http Request

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Plain http(s), also, soap uses plain http(s) for the transfer in most cases, sometimes smtp.

It's in the name by the way, xml http request.