Sippet.Message.delete_header

You're seeing just the function delete_header, go back to Sippet.Message module for more information.
Link to this function

delete_header(message, header)

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Specs

delete_header(t(), header()) :: t()

Deletes all header values in message.

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.delete_header(:content_language)
%Sippet.Message{body: nil, headers: %{max_forwards: 70},
 start_line: %Sippet.Message.RequestLine{method: :invite,
  request_uri: %Sippet.URI{authority: "foo@bar.com", headers: nil,
   host: "bar.com", parameters: nil, port: 5060, scheme: "sip",
   userinfo: "foo"}, version: {2, 0}}, target: nil}