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#!/usr/bin/perl
use strict;
use warnings;

# taken from https://metacpan.org/source/GAAS/HTTP-Message-6.06/lib/HTTP/Status.pm
my %StatusCode = (
    100 => 'Continue',
    101 => 'Switching Protocols',
    102 => 'Processing',                      # RFC 2518 (WebDAV)
    200 => 'OK',
    201 => 'Created',
    202 => 'Accepted',
    203 => 'Non-Authoritative Information',
    204 => 'No Content',
    205 => 'Reset Content',
    206 => 'Partial Content',
    207 => 'Multi-Status',                    # RFC 2518 (WebDAV)
    208 => 'Already Reported',             # RFC 5842
    300 => 'Multiple Choices',
    301 => 'Moved Permanently',
    302 => 'Found',
    303 => 'See Other',
    304 => 'Not Modified',
    305 => 'Use Proxy',
    307 => 'Temporary Redirect',
    400 => 'Bad Request',
    401 => 'Unauthorized',
    402 => 'Payment Required',
    403 => 'Forbidden',
    404 => 'Not Found',
    405 => 'Method Not Allowed',
    406 => 'Not Acceptable',
    407 => 'Proxy Authentication Required',
    408 => 'Request Timeout',
    409 => 'Conflict',
    410 => 'Gone',
    411 => 'Length Required',
    412 => 'Precondition Failed',
    413 => 'Request Entity Too Large',
    414 => 'Request-URI Too Large',
    415 => 'Unsupported Media Type',
    416 => 'Request Range Not Satisfiable',
    417 => 'Expectation Failed',
    418 => 'I\'m a teapot',            # RFC 2324
    422 => 'Unprocessable Entity',            # RFC 2518 (WebDAV)
    423 => 'Locked',                          # RFC 2518 (WebDAV)
    424 => 'Failed Dependency',               # RFC 2518 (WebDAV)
    425 => 'No code',                         # WebDAV Advanced Collections
    426 => 'Upgrade Required',                # RFC 2817
    428 => 'Precondition Required',
    429 => 'Too Many Requests',
    431 => 'Request Header Fields Too Large',
    449 => 'Retry with',                      # unofficial Microsoft
    500 => 'Internal Server Error',
    501 => 'Not Implemented',
    502 => 'Bad Gateway',
    503 => 'Service Unavailable',
    504 => 'Gateway Timeout',
    505 => 'HTTP Version Not Supported',
    506 => 'Variant Also Negotiates',         # RFC 2295
    507 => 'Insufficient Storage',            # RFC 2518 (WebDAV)
    509 => 'Bandwidth Limit Exceeded',        # unofficial
    510 => 'Not Extended',                    # RFC 2774
    511 => 'Network Authentication Required',
);

if (@ARGV==1) {
    my $key = shift @ARGV;
    if (my $msg = $StatusCode{$key}) {
        # httpstatus 403
        # httpstatus 500
        printf "%s\n", $msg;
    } elsif ($key =~ /^[12345]/) {
        # httpstatus 4
        # httpstatus 40
        for (sort keys %StatusCode) {
            next unless /^$key/;
            print "$_ $StatusCode{$_}\n";
        }
    } else {
        # httpstatus Bad
        # httpstatus Forbidden
        for (sort keys %StatusCode) {
            next unless $StatusCode{$_} =~ /$key/;
            print "$_ $StatusCode{$_}\n";
        }
    }
} else {
    # List all http status
    for (sort keys %StatusCode) {
        print "$_ $StatusCode{$_}\n";
    }
}

__END__

=encoding utf8

=head1 NAME

httpstatus - Display HTTP status code information

=head1 SYNOPSIS

    # List 4xx status
    % httpstatus 4
    400 Bad Request
    401 Unauthorized
    402 Payment Required
    403 Forbidden
    404 Not Found
    405 Method Not Allowed
    406 Not Acceptable
    407 Proxy Authentication Required
    408 Request Timeout
    409 Conflict
    410 Gone
    411 Length Required
    412 Precondition Failed
    413 Request Entity Too Large
    414 Request-URI Too Large
    415 Unsupported Media Type
    416 Request Range Not Satisfiable
    417 Expectation Failed
    418 I'm a teapot
    422 Unprocessable Entity
    423 Locked
    424 Failed Dependency
    425 No code
    426 Upgrade Required
    428 Precondition Required
    429 Too Many Requests
    431 Request Header Fields Too Large
    449 Retry with

    # List 40x status
    % httpstatus 40
    400 Bad Request
    401 Unauthorized
    402 Payment Required
    403 Forbidden
    404 Not Found
    405 Method Not Allowed
    406 Not Acceptable
    407 Proxy Authentication Required
    408 Request Timeout
    409 Conflict

    % httpstatus 500
    Internal Server Error

    % httpstatus 403
    Forbidden

    # grep status messages
    % httpstatus Bad
    400 Bad Request
    502 Bad Gateway

    # And, display all messages
    % httpstatus
    ...

=head1 DESCRIPTION

App::httpstatus is a simple application to display information about HTTP status code.

=head1 AUTHOR

Tokuhiro Matsuno E<lt>tokuhirom AAJKLFJEF@ GMAIL COME<gt>

=head1 SEE ALSO

=head1 LICENSE

Copyright (C) Tokuhiro Matsuno

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

=cut