The HTTP request message body as stream. POST data should be here. If a stream is set, which overrides the message body, the stream must have all the content data available by the time the WebResourceRequested event deferral of this response is completed. Stream should be agile or be created from a background STA to prevent performance impact to the UI thread. Null means no content data. IStream semantics apply (return S_OK to Read runs until all data is exhausted).
The mutable HTTP request headers
The HTTP request method.
The request URI.
Sets the Content property.
Sets the Method property.
Sets the Uri property.