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Small and composable HTTP client.

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mint lib mint core transport.ex
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lib/mint/core/transport.ex 

defmodule Mint.Core.Transport do
  @moduledoc false
  @type error() :: {:error, %Mint.TransportError{}}
  alias Mint.Types
  @callback connect(host :: String.t(), port :: :inet.port_number(), opts :: keyword()) ::
              {:ok, Types.socket()} | error()
  @callback upgrade(
              Types.socket(),
              original_scheme :: Types.scheme(),
              hostname :: String.t(),
              :inet.port_number(),
              opts :: keyword()
            ) :: {:ok, Types.socket()} | error()
  @callback negotiated_protocol(Types.socket()) ::
              {:ok, protocol :: binary()} | {:error, :protocol_not_negotiated}
  @callback send(Types.socket(), payload :: iodata()) :: :ok | error()
  @callback close(Types.socket()) :: :ok | error()
  @callback recv(Types.socket(), bytes :: non_neg_integer()) :: {:ok, binary()} | error()
  @callback setopts(Types.socket(), opts :: keyword()) :: :ok | error()
  @callback getopts(Types.socket(), opts :: keyword()) :: {:ok, opts :: keyword()} | error()
  @callback wrap_error(reason :: term()) :: %Mint.TransportError{}
end