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            Currently, if your proxy requires authorization, you have to
            specify an appropriate "Proxy-Authorization" header in every
            request.

            Note that this module will prefer an existing persistent
            connection, even if that connection was made using another
            proxy. If you need to ensure that a new connection is made in
            this case, you can either force "persistent" to false or e.g.
            use the proxy address in your "sessionid".

        body => $string
            The request body, usually empty. Will be sent as-is (future
            versions of this module might offer more options).

        cookie_jar => $hash_ref
            Passing this parameter enables (simplified) cookie-processing,
            loosely based on the original netscape specification.

            The $hash_ref must be an (initially empty) hash reference which
            will get updated automatically. It is possible to save the
            cookie jar to persistent storage with something like JSON or
            Storable - see the "AnyEvent::HTTP::cookie_jar_expire" function
            if you wish to remove expired or session-only cookies, and also
            for documentation on the format of the cookie jar.

            Note that this cookie implementation is not meant to be
            complete. If you want complete cookie management you have to do
            that on your own. "cookie_jar" is meant as a quick fix to get
            most cookie-using sites working. Cookies are a privacy disaster,
            do not use them unless required to.

            When cookie processing is enabled, the "Cookie:" and
            "Set-Cookie:" headers will be set and handled by this module,
            otherwise they will be left untouched.

        tls_ctx => $scheme | $tls_ctx
            Specifies the AnyEvent::TLS context to be used for https
            connections. This parameter follows the same rules as the
            "tls_ctx" parameter to AnyEvent::Handle, but additionally, the
            two strings "low" or "high" can be specified, which give you a
            predefined low-security (no verification, highest compatibility)
            and high-security (CA and common-name verification) TLS context.

            The default for this option is "low", which could be interpreted
            as "give me the page, no matter what".

            See also the "sessionid" parameter.

        sessionid => $string
            The module might reuse connections to the same host internally
            (regardless of other settings, such as "tcp_connect" or
            "proxy"). Sometimes (e.g. when using TLS or a specfic proxy),
            you do not want to reuse connections from other sessions. This
            can be achieved by setting this parameter to some unique ID
            (such as the address of an object storing your state data or the
            TLS context, or the proxy IP) - only connections using the same
            unique ID will be reused.

        on_prepare => $callback->($fh)
            In rare cases you need to "tune" the socket before it is used to
            connect (for example, to bind it on a given IP address). This
            parameter overrides the prepare callback passed to
            "AnyEvent::Socket::tcp_connect" and behaves exactly the same way
            (e.g. it has to provide a timeout). See the description for the
            $prepare_cb argument of "AnyEvent::Socket::tcp_connect" for
            details.

        tcp_connect => $callback->($host, $service, $connect_cb,
        $prepare_cb)
            In even rarer cases you want total control over how
            AnyEvent::HTTP establishes connections. Normally it uses
            AnyEvent::Socket::tcp_connect to do this, but you can provide
            your own "tcp_connect" function - obviously, it has to follow
            the same calling conventions, except that it may always return a
            connection guard object.

            The connections made by this hook will be treated as equivalent
            to connections made the built-in way, specifically, they will be
            put into and taken from the persistent connection cache. If your
            $tcp_connect function is incompatible with this kind of re-use,
            consider switching off "persistent" connections and/or providing
            a "sessionid" identifier.

            There are probably lots of weird uses for this function,
            starting from tracing the hosts "http_request" actually tries to
            connect, to (inexact but fast) host => IP address caching or
            even socks protocol support.

        on_header => $callback->($headers)
            When specified, this callback will be called with the header
            hash as soon as headers have been successfully received from the
            remote server (not on locally-generated errors).

            It has to return either true (in which case AnyEvent::HTTP will
            continue), or false, in which case AnyEvent::HTTP will cancel
            the download (and call the finish callback with an error code of
            598).

            This callback is useful, among other things, to quickly reject
            unwanted content, which, if it is supposed to be rare, can be
            faster than first doing a "HEAD" request.

            The downside is that cancelling the request makes it impossible
            to re-use the connection. Also, the "on_header" callback will
            not receive any trailer (headers sent after the response body).

            Example: cancel the request unless the content-type is
            "text/html".

               on_header => sub {
                  $_[0]{"content-type"} =~ /^text\/html\s*(?:;|$)/
               },

        on_body => $callback->($partial_body, $headers)
            When specified, all body data will be passed to this callback
            instead of to the completion callback. The completion callback
            will get the empty string instead of the body data.

            It has to return either true (in which case AnyEvent::HTTP will
            continue), or false, in which case AnyEvent::HTTP will cancel
            the download (and call the completion callback with an error