view release on metacpan or  search on metacpan

README  view on Meta::CPAN

            The downside to cancelling the request is that it makes it
            impossible to re-use the connection.

            This callback is useful when the data is too large to be held in
            memory (so the callback writes it to a file) or when only some
            information should be extracted, or when the body should be
            processed incrementally.

            It is usually preferred over doing your own body handling via
            "want_body_handle", but in case of streaming APIs, where HTTP is
            only used to create a connection, "want_body_handle" is the
            better alternative, as it allows you to install your own event
            handler, reducing resource usage.

        want_body_handle => $enable
            When enabled (default is disabled), the behaviour of
            AnyEvent::HTTP changes considerably: after parsing the headers,
            and instead of downloading the body (if any), the completion
            callback will be called. Instead of the $body argument
            containing the body data, the callback will receive the
            AnyEvent::Handle object associated with the connection. In error
            cases, "undef" will be passed. When there is no body (e.g.
            status 304), the empty string will be passed.

            The handle object might or might not be in TLS mode, might be
            connected to a proxy, be a persistent connection, use chunked
            transfer encoding etc., and configured in unspecified ways. The
            user is responsible for this handle (it will not be used by this
            module anymore).

            This is useful with some push-type services, where, after the
            initial headers, an interactive protocol is used (typical
            example would be the push-style twitter API which starts a
            JSON/XML stream).

            If you think you need this, first have a look at "on_body", to
            see if that doesn't solve your problem in a better way.

        persistent => $boolean
            Try to create/reuse a persistent connection. When this flag is
            set (default: true for idempotent requests, false for all
            others), then "http_request" tries to re-use an existing
            (previously-created) persistent connection to same host (i.e.
            identical URL scheme, hostname, port and sessionid) and, failing
            that, tries to create a new one.

            Requests failing in certain ways will be automatically retried
            once, which is dangerous for non-idempotent requests, which is
            why it defaults to off for them. The reason for this is because
            the bozos who designed HTTP/1.1 made it impossible to
            distinguish between a fatal error and a normal connection
            timeout, so you never know whether there was a problem with your
            request or not.

            When reusing an existent connection, many parameters (such as
            TLS context) will be ignored. See the "sessionid" parameter for
            a workaround.

        keepalive => $boolean
            Only used when "persistent" is also true. This parameter decides
            whether "http_request" tries to handshake a HTTP/1.0-style
            keep-alive connection (as opposed to only a HTTP/1.1 persistent
            connection).

            The default is true, except when using a proxy, in which case it
            defaults to false, as HTTP/1.0 proxies cannot support this in a
            meaningful way.

        handle_params => { key => value ... }
            The key-value pairs in this hash will be passed to any
            AnyEvent::Handle constructor that is called - not all requests
            will create a handle, and sometimes more than one is created, so
            this parameter is only good for setting hints.

            Example: set the maximum read size to 4096, to potentially
            conserve memory at the cost of speed.

               handle_params => {
                  max_read_size => 4096,
               },

        Example: do a simple HTTP GET request for http://www.nethype.de/ and
        print the response body.

           http_request GET => "http://www.nethype.de/", sub {
              my ($body, $hdr) = @_;
              print "$body\n";
           };

        Example: do a HTTP HEAD request on https://www.google.com/, use a
        timeout of 30 seconds.

           http_request
              HEAD    => "https://www.google.com",
              headers => { "user-agent" => "MySearchClient 1.0" },
              timeout => 30,
              sub {
                 my ($body, $hdr) = @_;
                 use Data::Dumper;
                 print Dumper $hdr;
              }
           ;

        Example: do another simple HTTP GET request, but immediately try to
        cancel it.

           my $request = http_request GET => "http://www.nethype.de/", sub {
              my ($body, $hdr) = @_;
              print "$body\n";
           };

           undef $request;

  DNS CACHING
    AnyEvent::HTTP uses the AnyEvent::Socket::tcp_connect function for the
    actual connection, which in turn uses AnyEvent::DNS to resolve
    hostnames. The latter is a simple stub resolver and does no caching on
    its own. If you want DNS caching, you currently have to provide your own
    default resolver (by storing a suitable resolver object in
    $AnyEvent::DNS::RESOLVER) or your own "tcp_connect" callback.