Sippet.Message.fetch_header

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fetch_header(message, header)

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fetch_header(t(), header()) :: {:ok, value()} | :error

Fetches all values for a specific header and returns it in a tuple.

If the header does not exist, returns :error.

Examples:

iex> request =
...>   Sippet.Message.build_request(:invite, "sip:foo@bar.com")
...>   |> Sippet.Message.put_header(:content_language, ["en-US", "de-DE"])
...>   |> Sippet.Message.put_header(:max_forwards, 70)
iex> request |> Sippet.Message.fetch_header(:content_language)
{:ok, ["en-US", "de-DE"]}
iex> request |> Sippet.Message.fetch_header(:cseq)
:error