Mint.HTTP2.recv

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

recv(conn, byte_count, timeout)

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Specs

recv(t(), non_neg_integer(), timeout()) ::
  {:ok, t(), [Mint.Types.response()]}
  | {:error, t(), Mint.Types.error(), [Mint.Types.response()]}

See Mint.HTTP.recv/3.