Mint.HTTP2.stream_request_body

You're seeing just the function stream_request_body, go back to Mint.HTTP2 module for more information.
Link to this function

stream_request_body(conn, request_ref, chunk)

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Specs

stream_request_body(
  t(),
  Mint.Types.request_ref(),
  iodata() | :eof | {:eof, trailing_headers :: Mint.Types.headers()}
) :: {:ok, t()} | {:error, t(), Mint.Types.error()}

See Mint.HTTP.stream_request_body/3.