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-type header() :: {string() | atom(), string()}.
-type headers() :: [header()].
-type socket() :: _.
-type option() ::
    {connect_options, list()} |
    {connect_timeout, timeout()} |
    {connection_timeout, non_neg_integer() | infinity} |
    {max_connections, non_neg_integer()} |
    {send_retry, non_neg_integer()} |
    {stream_to, pid()} |
    {partial_upload, non_neg_integer() | infinity} |
    {partial_download, pid(), non_neg_integer() | infinity}.
-type options() :: [option()].
-type host() :: string() | {integer(), integer(), integer(), integer()}.
-type socket_options() :: [{atom(), term()} | atom()].
-type window_size() :: non_neg_integer() | infinity.