-type body_result() ::
          {ok, binary(), parser()} |
          {trailer, {binary(), binary()}, parser()} |
          {more, parser()} |
          {more, parser(), binary()} |
          {done, binary()} |
          {error, term()}.

-type header_result() :: {headers_complete, parser()} | {header, {binary(), binary()}, parser()}.

-type http_method() :: binary().

-type http_reason() :: binary().

-type http_version() :: {non_neg_integer(), non_neg_integer()}.

-type parser() ::
          #h1_parser{type :: auto | request | response,
                     state :: on_first_line | on_header | on_body | on_trailers | on_junk | done,
                     buffer :: binary(),
                     version :: undefined | {non_neg_integer(), non_neg_integer()},
                     method :: undefined | binary(),
                     status :: undefined | 100..599,
                     partial_headers :: [{binary(), binary()}],
                     clen :: undefined | non_neg_integer() | bad_int | conflict,
                     te :: undefined | binary(),
                     connection :: undefined | binary(),
                     ctype :: undefined | binary(),
                     upgrade :: undefined | binary(),
                     expect :: undefined | binary(),
                     body_framing ::
                         undefined | no_body |
                         {content_length, non_neg_integer()} |
                         chunked | close_delimited,
                     body_state :: waiting | done | {stream, fun(), term(), fun()},
                     body_read :: non_neg_integer(),
                     max_line_length :: pos_integer(),
                     max_empty_lines :: non_neg_integer(),
                     max_header_name_size :: pos_integer(),
                     max_header_value_size :: pos_integer(),
                     max_headers :: pos_integer(),
                     max_body_size :: pos_integer() | infinity,
                     empty_lines :: non_neg_integer(),
                     header_count :: non_neg_integer()}.

-type parser_option() ::
          request | response | auto |
          {max_line_length, pos_integer()} |
          {max_empty_lines, non_neg_integer()} |
          {max_header_name_size, pos_integer()} |
          {max_header_value_size, pos_integer()} |
          {max_headers, pos_integer()} |
          {max_body_size, pos_integer() | infinity} |
          {method, binary()} |
          {status, 100..599}.

-type parser_result() ::
          {response, http_version(), status(), http_reason(), parser()} |
          {request, http_method(), uri(), http_version(), parser()} |
          {more, parser()} |
          header_result() |
          body_result() |
          {error, term()}.

-type request_result() ::
          {ok, http_method(), binary(), binary(), http_version(), [{binary(), binary()}], binary()} |
          {more, binary()} |
          {error, term()}.

-type response_result() ::
          {ok, http_version(), status(), http_reason(), [{binary(), binary()}], binary()} |
          {more, binary()} |
          {error, term()}.

-type status() :: 100..599.

-type uri() :: binary().