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If the server sends a header multiple times, then their contents will be
joined together with a comma (C<,>), as per the HTTP spec.

If an internal error occurs, such as not being able to resolve a hostname,
then C<$data> will be C<undef>, C<< $headers->{Status} >> will be
C<590>-C<599> and the C<Reason> pseudo-header will contain an error
message. Currently the following status codes are used:

=over 4

=item 595 - errors during connection establishment, proxy handshake.

=item 596 - errors during TLS negotiation, request sending and header processing.

=item 597 - errors during body receiving or processing.

=item 598 - user aborted request via C<on_header> or C<on_body>.

=item 599 - other, usually nonretryable, errors (garbled URL etc.).

=back

A typical callback might look like this:

   sub {
      my ($body, $hdr) = @_;

      if ($hdr->{Status} =~ /^2/) {
         ... everything should be ok
      } else {
         print "error, $hdr->{Status} $hdr->{Reason}\n";
      }
   }

Additional parameters are key-value pairs, and are fully optional. They
include:

=over 4

=item recurse => $count (default: $MAX_RECURSE)

Whether to recurse requests or not, e.g. on redirects, authentication and
other retries and so on, and how often to do so.

Only redirects to http and https URLs are supported. While most common
redirection forms are handled entirely within this module, some require
the use of the optional L<URI> module. If it is required but missing, then
the request will fail with an error.

=item headers => hashref

The request headers to use. Currently, C<http_request> may provide its own
C<Host:>, C<Content-Length:>, C<Connection:> and C<Cookie:> headers and
will provide defaults at least for C<TE:>, C<Referer:> and C<User-Agent:>
(this can be suppressed by using C<undef> for these headers in which case
they won't be sent at all).

You really should provide your own C<User-Agent:> header value that is
appropriate for your program - I wouldn't be surprised if the default
AnyEvent string gets blocked by webservers sooner or later.

Also, make sure that your headers names and values do not contain any
embedded newlines.

=item timeout => $seconds

The time-out to use for various stages - each connect attempt will reset
the timeout, as will read or write activity, i.e. this is not an overall
timeout.

Default timeout is 5 minutes.

=item proxy => [$host, $port[, $scheme]] or undef

Use the given http proxy for all requests, or no proxy if C<undef> is
used.

C<$scheme> must be either missing or must be C<http> for HTTP.

If not specified, then the default proxy is used (see
C<AnyEvent::HTTP::set_proxy>).

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
C<persistent> to false or e.g. use the proxy address in your C<sessionid>.

=item body => $string

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

=item cookie_jar => $hash_ref

Passing this parameter enables (simplified) cookie-processing, loosely
based on the original netscape specification.

The C<$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
C<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. C<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 C<Cookie:> and C<Set-Cookie:>
headers will be set and handled by this module, otherwise they will be
left untouched.

=item tls_ctx => $scheme | $tls_ctx

Specifies the AnyEvent::TLS context to be used for https connections. This