2.2.11 X-RequestDigest Header
This protocol uses the X-RequestDigest header as an alternative to the __REQUESTDIGEST form parameter on an HTTP POST request.
This header is defined in ABNF syntax as follows.
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requestdigest-header = "X-RequestDigest" ":" requestdigest-value requestdigest-value = 1*TEXT
The requestdigest-value element is the form digest.