Sippet.Message.fetch_header-exclamation-mark

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fetch_header!(message, header)

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Specs

fetch_header!(t(), header()) :: value() | no_return()

Fetches all values for a specific header in the given message, erroring out if message doesn't contain header.

If message contains the given header, all corresponding values are returned in a list. If message doesn't contain the header, a KeyError exception is raised.