package Protocol::HTTP2;
use 5.008005;
use strict;
use warnings;

our $VERSION = "1.14";

sub ident_plain {
    'h2c';
}

sub ident_tls {
    'h2';
}

1;
__END__

=encoding utf-8

=head1 NAME

Protocol::HTTP2 - HTTP/2 protocol implementation (RFC 7540)

=head1 SYNOPSIS

    use Protocol::HTTP2;

    # get protocol identification string for secure connections
    print Protocol::HTTP2::ident_tls;           # h2

    # get protocol identification string for non-secure connections
    print Protocol::HTTP2::ident_plain;         # h2c

=head1 DESCRIPTION

Protocol::HTTP2 is HTTP/2 protocol implementation (L<RFC 7540|https://tools.ietf.org/html/rfc7540>) with stateful
decoders/encoders of HTTP/2 frames. You may use this module to implement your
own HTTP/2 client/server/intermediate on top of your favorite event loop over
plain or tls socket (see examples).

=head1 STATUS

Current status - beta. Structures, module names and methods seems like stable.
I've started this project to understand internals of HTTP/2 and may be it will
never become production, but at least it works.

    | Spec                    |      status     |
    | ----------------------- | --------------- |
    | Negotiation             |   ALPN, NPN,    |
    |                         | Upgrade, direct |
    | Preface                 |        +        |
    | Headers (de)compression |        +        |
    | Stream states           |        +        |
    | Flow control            |        ±        |
    | Stream priority         |        ±        |
    | Server push             |        +        |
    | Connect method          |        -        |


    | Frame           | encoder | decoder |
    | --------------- |:-------:|:-------:|
    | DATA            |    ±    |    +    |
    | HEADERS         |    +    |    +    |
    | PRIORITY        |    +    |    +    |
    | RST_STREAM      |    +    |    +    |
    | SETTINGS        |    +    |    +    |
    | PUSH_PROMISE    |    +    |    +    |
    | PING            |    +    |    +    |
    | GOAWAY          |    +    |    +    |
    | WINDOW_UPDATE   |    +    |    +    |
    | CONTINUATION    |    ±    |    +    |


=over

=item - -- not implemented

=item ± -- incomplete

=item + -- implemented (may even work)

=back

=head1 MODULES

=head2 L<Protocol::HTTP2::Client>

Client protocol decoder/encoder with constructor of requests

=head2 L<Protocol::HTTP2::Server>

Server protocol decoder/encoder with constructor of responses/pushes

=head2 L<Protocol::HTTP2::Connection>

Main low level module for protocol logic and state processing. Connection
object is a mixin of L<Protocol::HTTP2::Frame> (frame encoding/decoding),
L<Protocol::HTTP2::Stream> (stream operations) and L<Protocol::HTTP2::Upgrade>
(HTTP/1.1 Upgrade support)

=head2 L<Protocol::HTTP2::HeaderCompression>

Module implements HPACK - Header Compression for HTTP/2 (L<RFC 7541|https://tools.ietf.org/html/rfc7541>).

=head2 L<Protocol::HTTP2::Constants>

Module contains all defined in HTTP/2 protocol constants and default values

=head2 L<Protocol::HTTP2::Trace>

Module for debugging. You can setup HTTP2_DEBUG environment variable to change
verbosity of the module (output to STDOUT). Default level is error.

    $ export HTTP2_DEBUG=debug
    $ perl ./http2_program

=head1 SEE ALSO

L<https://github.com/vlet/p5-Protocol-HTTP2/wiki> - Protocol::HTTP2 wiki

L<http://http2.github.io/> - official HTTP/2 specification site

L<http://daniel.haxx.se/http2/> - http2 explained

=head1 LICENSE

Copyright (C) Vladimir Lettiev.

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=head1 AUTHOR

Vladimir Lettiev E<lt>thecrux@gmail.comE<gt>

=cut