File Coverage

blib/lib/Dancer2/Core/Request.pm

Criterion	Covered	Total	%
statement	300	318	94.3
branch	107	128	83.5
condition	40	56	71.4
subroutine	79	85	92.9
pod	46	53	86.7
total	572	640	89.3

# ABSTRACT: Interface for accessing incoming requests
$Dancer2::Core::Request::VERSION = '0.400000';
use strict;
use warnings;
use parent 'Plack::Request';

use Carp;
use Encode;
use URI;
use URI::Escape;
use Safe::Isa;
use Hash::MultiValue;
use Module::Runtime 'require_module';
use Ref::Util qw< is_ref is_arrayref is_hashref >;

use Dancer2::Core::Types;
use Dancer2::Core::Request::Upload;
use Dancer2::Core::Cookie;

# add an attribute for each HTTP_* variables
# (HOST is managed manually)
my @http_env_keys = (qw/
    accept_charset
    accept_encoding
    accept_language
    connection
    keep_alive
    x_requested_with
/);

# apparently you can't eval core functions

eval << "_EVAL" or die $@ for @http_env_keys; ## no critic
sub $_ { \$_[0]->env->{ 'HTTP_' . ( uc "$_" ) } }
1;
_EVAL

# check presence of XS module to speedup request
our $XS_URL_DECODE         = eval { require_module('URL::Encode::XS'); 1; };
our $XS_PARSE_QUERY_STRING = eval { require_module('CGI::Deurl::XS');  1; };
our $XS_HTTP_COOKIES       = eval { require_module('HTTP::XSCookies'); 1; };

our $_id = 0;

# self->new( env => {}, serializer => $s, is_behind_proxy => 0|1 )
    my ( $class, @args ) = @_;

    # even sized list
    @args % 2 == 0
        or croak 'Must provide even sized list';

    my %opts = @args;
    my $env  = $opts{'env'};

    my $self = $class->SUPER::new($env);

    if ( my $s = $opts{'serializer'} ) {
        $s->$_does('Dancer2::Core::Role::Serializer')
            or croak 'Serializer provided not a Serializer object';

        $self->{'serializer'} = $s;
    }

    # additionally supported attributes
    $self->{'id'}              = ++$_id;
    $self->{'vars'}            = {};
    $self->{'is_behind_proxy'} = !!$opts{'is_behind_proxy'};

    $opts{'body_params'}
        and $self->{'_body_params'} = $opts{'body_params'};

    # Deserialize/parse body for HMV
    $self->data;
    $self->_build_uploads();

    return $self;
}

# a buffer for per-request variables

    my $self = shift;
    @_ == 2
      ? $self->vars->{ $_[0] } = $_[1]
      : $self->vars->{ $_[0] };
}

# I don't like this. I know send_file uses this and I wonder
# if we can remove it.
#   -- Sawyer

# XXX: incompatible with Plack::Request


# Private 'read-only' attributes for request params. See the params()
# method for the public interface.
#
# _body_params, _query_params and _route_params have setter methods that
# decode byte string to characters before setting; If you know you have
# decoded (character) params, such as output from a deserializer, you can
# set these directly in the request object hash to avoid the decode op.




    my ( $self, $params ) = @_;
    $self->{_query_params} = _decode( $params );
}


    my ( $self, $params ) = @_;
    $self->{_route_params} = _decode( $params );
    $self->_build_params();
}

# XXX: incompatible with Plack::Request


    my ($self) = @_;

    if ( $self->is_behind_proxy and exists $self->env->{'HTTP_X_FORWARDED_HOST'} ) {
        my @hosts = split /\s*,\s*/, $self->env->{'HTTP_X_FORWARDED_HOST'}, 2;
        return $hosts[0];
    } else {
        return $self->env->{'HTTP_HOST'};
    }
}

# aliases, kept for backward compat

# there are two options
    $_[0]->env->{'HTTP_X_FORWARDED_PROTO'}    ||
    $_[0]->env->{'HTTP_X_FORWARDED_PROTOCOL'} ||
    $_[0]->env->{'HTTP_FORWARDED_PROTO'}
}

    my ($self) = @_;
    my $scheme = $self->is_behind_proxy
               ? $self->forwarded_protocol
               : '';

    return $scheme || $self->env->{'psgi.url_scheme'};
}



    my $self = shift;

    my $serializer = $self->serializer
        or return;

    # The latest draft of the RFC does not forbid DELETE to have content,
    # rather the behaviour is undefined. Take the most lenient route and
    # deserialize any content on delete as well.
    return
      unless grep { $self->method eq $_ } qw/ PUT POST PATCH DELETE /;

    # try to deserialize
    my $body = $self->body;

    $body && length $body > 0
        or return;

    # Catch serializer fails - which is tricky as Role::Serializer
    # wraps the deserializaion in an eval and returns undef.
    # We want to generate a 500 error on serialization fail (Ref #794)
    # to achieve that, override the log callback so we can catch a signal
    # that it failed. This is messy (messes with serializer internals), but
    # "works".
    my $serializer_fail;
    my $serializer_log_cb = $serializer->log_cb;
    local $serializer->{log_cb} = sub {
        $serializer_fail = $_[1];
        $serializer_log_cb->(@_);
    };
    # work-around to resolve a chicken-and-egg issue when instantiating a
    # request object; the serializer needs that request object to deserialize
    # the body params.
    Scalar::Util::weaken( my $request = $self );
    $self->serializer->has_request || $self->serializer->set_request($request);
    my $data = $serializer->deserialize($body);
    die $serializer_fail if $serializer_fail;

    # Set _body_params directly rather than using the setter. Deserializiation
    # returns characters and skipping the decode op in the setter ensures
    # that numerical data "stays" numerical; decoding an SV that is an IV
    # converts that to a PVIV. Some serializers are picky (JSON)..
    $self->{_body_params} = $data;

    # Set body parameters (decoded HMV)
    $self->{'body_parameters'} =
        Hash::MultiValue->from_mixed( is_hashref($data) ? %$data : () );

    return $data;
}



# public interface compat with CGI.pm objects

    my ($self) = @_;
    return "[#" . $self->id . "] " . $self->method . " " . $self->path;
}

    my $self = shift;
    my $uri  = $self->_common_uri;

    return $uri->canonical;
}

    my $self = shift;

    my $path   = $self->env->{SCRIPT_NAME};
    my $port   = $self->env->{SERVER_PORT};
    my $server = $self->env->{SERVER_NAME};
    my $host   = $self->host;
    my $scheme = $self->scheme;

    my $uri = URI->new;
    $uri->scheme($scheme);
    $uri->authority( $host || "$server:$port" );
    $uri->path( $path      || '/' );

    return $uri;
}

    my $self  = shift;
    my $uri   = $self->_common_uri;
    my $canon = $uri->canonical;

    if ( $uri->path eq '/' ) {
        $canon =~ s{/$}{};
    }

    return $canon;
}

    warn q{DEPRECATED: request->dispatch_path. Please use request->path instead};
    return shift->path;
}

    my ( $self, $part, $params, $dont_escape ) = @_;

    $part ||= '';
    my $uri = $self->base;

    # Make sure there's exactly one slash between the base and the new part
    my $base = $uri->path;
    $base =~ s|/$||;
    $part =~ s|^/||;
    $uri->path("$base/$part");

    $uri->query_form($params) if $params;

    return $dont_escape
           ? uri_unescape( ${ $uri->canonical } )
           : ${ $uri->canonical };
}

    my ( $self, $source ) = @_;

    return %{ $self->_params } if wantarray && @_ == 1;
    return $self->_params if @_ == 1;

    if ( $source eq 'query' ) {
        return %{ $self->_query_params || {} } if wantarray;
        return $self->_query_params;
    }
    elsif ( $source eq 'body' ) {
        return %{ $self->_body_params || {} } if wantarray;
        return $self->_body_params;
    }
    if ( $source eq 'route' ) {
        return %{ $self->_route_params } if wantarray;
        return $self->_route_params;
    }
    else {
        croak "Unknown source params \"$source\".";
    }
}

    my $self = shift;
    $self->{'query_parameters'} ||= do {
        if ($XS_PARSE_QUERY_STRING) {
            my $query = _decode(CGI::Deurl::XS::parse_query_string(
                $self->env->{'QUERY_STRING'}
            ));

            Hash::MultiValue->new(
                map {;
                    my $key = $_;
                    is_arrayref( $query->{$key} )
                    ? ( map +( $key => $_ ), @{ $query->{$key} } )
                    : ( $key => $query->{$key} )
                } keys %{$query}
            );
        } else {
            # defer to Plack::Request
            _decode($self->SUPER::query_parameters);
        }
    };
}

# this will be filled once the route is matched

    my ( $self, $params ) = @_;
    # remove reserved splat parameter name
    # you should access splat parameters using splat() keyword
    delete @{$params}{qw<splat captures>};
    $self->{'route_parameters'} = Hash::MultiValue->from_mixed( %{_decode($params)} );
}

    my $self = shift;
    # defer to (the overridden) Plack::Request->body_parameters
    $self->{'body_parameters'} ||= _decode($self->SUPER::body_parameters());
}

    my ( $self, $type ) = @_;

    # handle a specific case
    if ($type) {
        my $attr = "${type}_parameters";
        return $self->$attr;
    }

    # merge together the *decoded* parameters
    $self->{'merged_parameters'} ||= do {
        my $query = $self->query_parameters;
        my $body  = $self->body_parameters;
        my $route = $self->route_parameters; # not in Plack::Request
        Hash::MultiValue->new( map $_->flatten, $query, $body, $route );
    };
}



# XXX: incompatible with Plack::Request

    my ($h) = @_;
    return if not defined $h;

    if ( !is_ref($h) && !utf8::is_utf8($h) ) {
        return decode( 'UTF-8', $h );
    }
    elsif ( ref($h) eq 'Hash::MultiValue' ) {
        return Hash::MultiValue->from_mixed(_decode($h->as_hashref_mixed));
    }
    elsif ( is_hashref($h) ) {
        return { map {my $t = _decode($_); $t} (%$h) };
    }
    elsif ( is_arrayref($h) ) {
        return [ map _decode($_), @$h ];
    }

    return $h;
}

    my $self = shift;

    return 0 unless defined $self->headers;
    return 0 unless defined $self->header('X-Requested-With');
    return 0 if $self->header('X-Requested-With') ne 'XMLHttpRequest';
    return 1;
}

# XXX incompatible with Plack::Request
# context-aware accessor for uploads
    my ( $self, $name ) = @_;
    my $res = $self->{uploads}{$name};

    return $res unless wantarray;
    return ()   unless defined $res;
    return ( is_arrayref($res) ) ? @$res : $res;
}

    my ($self) = @_;

    # params may have been populated by before filters
    # _before_ we get there, so we have to save it first
    my $previous = $self->_has_params ? $self->_params : {};

    # now parse environment params...
    my $get_params = $self->_parse_get_params();

    # and merge everything
    $self->{_params} = {
        map +( is_hashref($_) ? %{$_} : () ),
        $previous,
        $get_params,
        $self->_body_params,
        $self->_route_params,
    };

}

    my ( $self, $encoded ) = @_;
    return URL::Encode::XS::url_decode($encoded) if $XS_URL_DECODE;
    my $clean = $encoded;
    $clean =~ tr/\+/ /;
    $clean =~ s/%([a-fA-F0-9]{2})/pack "H2", $1/eg;
    return $clean;
}

    my ($self) = @_;
    return $self->_query_params if defined $self->{_query_params};

    my $query_params = {};

    my $source = $self->env->{QUERY_STRING};
    return if !defined $source || $source eq '';

    if ($XS_PARSE_QUERY_STRING) {
        $self->_set_query_params(
            CGI::Deurl::XS::parse_query_string($source) || {}
        );
        return $self->_query_params;
    }

    foreach my $token ( split /[&;]/, $source ) {
        my ( $key, $val ) = split( /=/, $token );
        next unless defined $key;
        $val = ( defined $val ) ? $val : '';
        $key = $self->_url_decode($key);
        $val = $self->_url_decode($val);

        # looking for multi-value params
        if ( exists $query_params->{$key} ) {
            my $prev_val = $query_params->{$key};
            if ( is_arrayref($prev_val) ) {
                push @{ $query_params->{$key} }, $val;
            }
            else {
                $query_params->{$key} = [ $prev_val, $val ];
            }
        }

        # simple value param (first time we see it)
        else {
            $query_params->{$key} = $val;
        }
    }
    $self->_set_query_params( $query_params );
    return $self->_query_params;
}

    my ($self) = @_;

    # parse body and build body params
    my $body_params = $self->_body_params;

    my $uploads = $self->SUPER::uploads;
    my %uploads;

    for my $name ( keys %$uploads ) {
        my @uploads = map Dancer2::Core::Request::Upload->new(
                             # For back-compatibility, we use a HashRef of headers
                             headers  => {@{$_->{headers}->psgi_flatten_without_sort}},
                             tempname => $_->{tempname},
                             size     => $_->{size},
                             filename => _decode( $_->{filename} ),
                      ), $uploads->get_all($name);

        $uploads{$name} = @uploads > 1 ? \@uploads : $uploads[0];

        # support access to the filename as a normal param
        my @filenames = map $_->{'filename'}, @uploads;
        $self->{_body_params}{$name} =
          @filenames > 1 ? \@filenames : $filenames[0];
    }

    $self->{uploads} = \%uploads;
}

# XXX: incompatible with Plack::Request

    my $self    = shift;
    my $cookies = {};

    my $http_cookie = $self->header('Cookie');
    return $cookies unless defined $http_cookie; # nothing to do

    if ( $XS_HTTP_COOKIES ) {
        $cookies = HTTP::XSCookies::crush_cookie($http_cookie);
    }
    else {
        # handle via Plack::Request
        $cookies = $self->SUPER::cookies();
    }

    # convert to objects
    while (my ($name, $value) = each %{$cookies}) {
        $cookies->{$name} = Dancer2::Core::Cookie->new(
            name  => $name,
            # HTTP::XSCookies v0.17+ will do the split and return an arrayref
            value => (is_arrayref($value) ? $value : [split(/[&;]/, $value)])
        );
    }
    return $cookies;
}

# poor man's clone
    my ($self, $params, $options) = @_;

    # shallow clone $env; we don't want to alter the existing one
    # in $self, then merge any overridden values
    my $env = { %{ $self->env }, %{ $options || {} } };

    my $new_request = __PACKAGE__->new(
        env         => $env,
        body_params => {},
    );

    # Clone and merge query params
    my $new_params = $self->params;
    $new_request->{_query_params} = { %{ $self->{_query_params} || {} } };
    $new_request->{query_parameters} = $self->query_parameters->clone;
    for my $key ( keys %{ $params || {} } ) {
        my $value = $params->{$key};
        $new_params->{$key} = $value;
        $new_request->{_query_params}->{$key} = $value;
        $new_request->{query_parameters}->add( $key => $value );
    }

    # Copy params (these are already decoded)
    $new_request->{_params}       = $new_params;
    $new_request->{_body_params}  = $self->{_body_params};
    $new_request->{_route_params} = $self->{_route_params};
    $new_request->{headers}       = $self->headers;

    # Copy remaining settings
    $new_request->{is_behind_proxy} = $self->{is_behind_proxy};
    $new_request->{vars}            = $self->{vars};

    # Clone any existing decoded & cached body params. (GH#1116 GH#1269)
    $new_request->{'body_parameters'} = $self->body_parameters->clone;

    # Delete merged HMV parameters, allowing them to be reconstructed on first use.
    delete $new_request->{'merged_parameters'};

    return $new_request;
}


    my ( $self, $route ) = @_;
    $self->{'route'} = $route;
}


    my $self = shift;
    return $self->data if $self->serializer;
    $self->_body_params;
    return $self->{_body_params} if keys %{ $self->{_body_params} };
    return $self->body;
}

1;


=pod

=encoding UTF-8

=head1 NAME

Dancer2::Core::Request - Interface for accessing incoming requests

=head1 VERSION

version 0.400000

=head1 SYNOPSIS

In a route handler, the current request object can be accessed by the
C<request> keyword:

    get '/foo' => sub {
        request->params; # request, params parsed as a hash ref
        request->body;   # returns the request body, unparsed
        request->path;   # the path requested by the client
        # ...
    };

=head1 DESCRIPTION

An object representing a Dancer2 request. It aims to provide a proper
interface to anything you might need from a web request.

=head1 METHODS

=head2 address

Return the IP address of the client.

=head2 base

Returns an absolute URI for the base of the application.  Returns a L<URI>
object (which stringifies to the URL, as you'd expect).

=head2 body_parameters

Returns a L<Hash::MultiValue> object representing the POST parameters.

=head2 body

Return the raw body of the request, unparsed.

If you need to access the body of the request, you have to use this accessor and
should not try to read C<psgi.input> by hand. C<Dancer2::Core::Request>
already did it for you and kept the raw body untouched in there.

=head2 body_data

Returns the body of the request in data form, making it possible to distinguish
between C<body_parameters>, a representation of the request parameters
(L<Hash::MultiValue>) and other forms of content.

If a serializer is set, this is the deserialized request body. Otherwise this is
the decoded body parameters (if any), or the body content itself.

=head2 content

Returns the undecoded byte string POST body.

=head2 cookies

Returns a reference to a hash containing cookies, where the keys are the names of the
cookies and values are L<Dancer2::Core::Cookie> objects.

=head2 data

If the application has a serializer and if the request has serialized
content, returns the deserialized structure as a hashref.

=head2 dispatch_path

Alias for L<path>. Deprecated.

=head2 env

Return the current PSGI environment hash reference.

=head2 header($name)

Return the value of the given header, if present. If the header has multiple
values, returns an the list of values if called in list context, the first one
in scalar.

=head2 headers

Returns either an L<HTTP::Headers> or an L<HTTP::Headers::Fast> object
representing the headers.

=head2 id

The ID of the request. This allows you to trace a specific request in loggers,
per the string created using C<to_string>.

The ID of the request is essentially the number of requests run in the current
class.

=head2 input

Alias to C<input_handle> method below.

=head2 input_handle

Alias to the PSGI input handle (C<< <request->env->{psgi.input}> >>)

=head2 is_ajax

Return true if the value of the header C<X-Requested-With> is
C<XMLHttpRequest>.

=head2 is_delete

Return true if the method requested by the client is 'DELETE'

=head2 is_get

Return true if the method requested by the client is 'GET'

=head2 is_head

Return true if the method requested by the client is 'HEAD'

=head2 is_post

Return true if the method requested by the client is 'POST'

=head2 is_put

Return true if the method requested by the client is 'PUT'

=head2 is_options

Return true if the method requested by the client is 'OPTIONS'

=head2 logger

Returns the C<psgix.logger> code reference, if exists.

=head2 method

Return the HTTP method used by the client to access the application.

While this method returns the method string as provided by the environment, it's
better to use one of the following boolean accessors if you want to inspect the
requested method.

=head2 new

The constructor of the class, used internally by Dancer2's core to create request
objects.

It uses the environment hash table given to build the request object:

    Dancer2::Core::Request->new( env => $env );

There are two additional parameters for instantiation:

=over 4

=item * serializer

A serializer object to work with when reading the request body.

=item * body_params

Provide body parameters.

Used internally when we need to avoid parsing the body again.

=back

=head2 param($key)

Calls the C<params> method below and fetches the key provided.

=head2 params($source)

Called in scalar context, returns a hashref of params, either from the specified
source (see below for more info on that) or merging all sources.

So, you can use, for instance:

    my $foo = params->{foo}

If called in list context, returns a list of key and value pairs, so you could use:

    my %allparams = params;

Parameters are merged in the following order: query, body, route - i.e. route
parameters have the highest priority:

    POST /hello/Ruth?name=Quentin

    name=Bobbie

    post '/hello/:name' => sub {
        return "Hello, " . route_parameters->get('name') . "!"; # returns Ruth
        return "Hello, " . query_parameters->get('name') . "!"; # returns Quentin
        return "Hello, " . body_parameters->get('name') . "!";  # returns Bobbie
        return "Hello, " . param('name') . "!";                 # returns Ruth
    };

The L</query_parameters>, L</route_parameters>, and L</body_parameters> keywords
provide a L<Hash::MultiValue> result from the three different parameters.
We recommend using these rather than C<params>, because of the potential for
unintentional behaviour - consider the following request and route handler:

    POST /artist/104/new-song

    name=Careless Dancing

    post '/artist/:id/new-song' => sub {
      find_artist(param('id'))->create_song(params);
      # oops! we just passed id into create_song,
      # but we probably only intended to pass name
      find_artist(param('id'))->create_song(body_parameters);
    };

    POST /artist/104/join-band

    id=4
    name=Dancing Misfits

    post '/artist/:id/new-song' => sub {
      find_artist(param('id'))->join_band(params);
      # oops! we just passed an id of 104 into join_band,
      # but we probably should have passed an id of 4
    };

=head2 parameters

Returns a L<Hash::MultiValue> object with merged GET and POST parameters.

Parameters are merged in the following order: query, body, route - i.e. route
parameters have the highest priority - see L</params> for how this works, and
associated risks and alternatives.

=head2 path

The path requested by the client, normalized. This is effectively
C<path_info> or a single forward C</>.

=head2 path_info

The raw requested path. This could be empty. Use C<path> instead.

=head2 port

Return the port of the server.

=head2 protocol

Return the protocol (I<HTTP/1.0> or I<HTTP/1.1>) used for the request.

=head2 query_parameters

Returns a L<Hash::MultiValue> parameters object.

=head2 query_string

Returns the portion of the request defining the query itself - this is
what comes after the C<?> in a URI.

=head2 raw_body

Alias to C<content> method.

=head2 remote_address

Alias for C<address> method.

=head2 remote_host

Return the remote host of the client. This only works with web servers configured
to do a reverse DNS lookup on the client's IP address.

=head2 request_method

Alias to the C<method> accessor, for backward-compatibility with C<CGI> interface.

=head2 request_uri

Return the raw, undecoded request URI path.

=head2 route

Return the L<route|Dancer2::Core::Route> which this request matched.

=head2 scheme

Return the scheme of the request

=head2 script_name

Return script_name from the environment.

=head2 secure

Return true or false, indicating whether the connection is secure - this is
effectively checking if the scheme is I<HTTPS> or not.

=head2 serializer

Returns the optional serializer object used to deserialize request parameters.

=head2 session

Returns the C<psgix.session> hash, if exists.

=head2 session_options

Returns the C<psgix.session.options> hash, if exists.

=head2 to_string

Return a string representing the request object (e.g., C<GET /some/path>).

=head2 upload($name)

Context-aware accessor for uploads. It's a wrapper around an access to the hash
table provided by C<uploads()>. It looks at the calling context and returns a
corresponding value.

If you have many file uploads under the same name, and call C<upload('name')> in
an array context, the accessor will unroll the ARRAY ref for you:

    my @uploads = request->upload('many_uploads'); # OK

Whereas with a manual access to the hash table, you'll end up with one element
in C<@uploads>, being the arrayref:

    my @uploads = request->uploads->{'many_uploads'};
    # $uploads[0]: ARRAY(0xXXXXX)

That is why this accessor should be used instead of a manual access to
C<uploads>.

=head2 uploads

Returns a reference to a hash containing uploads. Values can be either a
L<Dancer2::Core::Request::Upload> object, or an arrayref of
L<Dancer2::Core::Request::Upload>
objects.

You should probably use the C<upload($name)> accessor instead of manually accessing the
C<uploads> hash table.

=head2 uri

An alias to C<request_uri>.

=head2 uri_base

Same thing as C<base> above, except it removes the last trailing slash in the
path if it is the only path.

This means that if your base is I<http://myserver/>, C<uri_base> will return
I<http://myserver> (notice no trailing slash). This is considered very useful
when using templates to do the following thing:

    <link rel="stylesheet" href="[% request.uri_base %]/css/style.css" />

=head2 uri_for(path, params)

Constructs a URI from the base and the passed path. If params (hashref) is
supplied, these are added to the query string of the URI.

Thus, with the following base:

    http://localhost:5000/foo

You get the following behavior:

    my $uri = request->uri_for('/bar', { baz => 'baz' });
    print $uri; # http://localhost:5000/foo/bar?baz=baz

C<uri_for> returns a L<URI> object (which can stringify to the value).

=head2 user

Return remote user if defined.

=head2 var

By-name interface to variables stored in this request object.

  my $stored = $request->var('some_variable');

returns the value of 'some_variable', while

  $request->var('some_variable' => 'value');

will set it.

=head2 vars

Access to the internal hash of variables:

    my $value = $request->vars->{'my_key'};

You want to use C<var> above.

=head1 Common HTTP request headers

Commonly used client-supplied HTTP request headers are available through
specific accessors:

=over 4

=item C<accept>

HTTP header: C<HTTP_ACCEPT>.

=item C<accept_charset>

HTTP header: C<HTTP_ACCEPT_CHARSET>.

=item C<accept_encoding>

HTTP header: C<HTTP_ACCEPT_ENCODING>.

=item C<accept_language>

HTTP header: C<HTTP_ACCEPT_LANGUAGE>.

=item C<agent>

Alias for C<user_agent>) below.

=item C<connection>

HTTP header: C<HTTP_CONNECTION>.

=item C<content_encoding>

HTTP header: C<HTTP_CONTENT_ENCODING>.

=item C<content_length>

HTTP header: C<HTTP_CONTENT_LENGTH>.

=item C<content_type>

HTTP header: C<HTTP_CONTENT_TYPE>.

=item C<forwarded_for_address>

HTTP header: C<HTTP_X_FORWARDED_FOR>.

=item C<forwarded_host>

HTTP header: C<HTTP_X_FORWARDED_HOST>.

=item C<forwarded_protocol>

One of either C<HTTP_X_FORWARDED_PROTOCOL>, C<HTTP_X_FORWARDED_PROTO>, or
C<HTTP_FORWARDED_PROTO>.

=item C<host>

Checks whether we are behind a proxy using the C<behind_proxy>
configuration option, and if so returns the first
C<HTTP_X_FORWARDED_HOST>, since this is a comma separated list.

If you have not configured that you are behind a proxy, it returns HTTP
header C<HTTP_HOST>.

=item C<keep_alive>

HTTP header: C<HTTP_KEEP_ALIVE>.

=item C<referer>

HTTP header: C<HTTP_REFERER>.

=item C<user_agent>

HTTP header: C<HTTP_USER_AGENT>.

=item C<x_requested_with>

HTTP header: C<HTTP_X_REQUESTED_WITH>.

=back

=head1 Fetching only params from a given source

If a required source isn't specified, a mixed hashref (or list of key value
pairs, in list context) will be returned; this will contain params from all
sources (route, query, body).

In practical terms, this means that if the param C<foo> is passed both on the
querystring and in a POST body, you can only access one of them.

If you want to see only params from a given source, you can say so by passing
the C<$source> param to C<params()>:

    my %querystring_params = params('query');
    my %route_params       = params('route');
    my %post_params        = params('body');

If source equals C<route>, then only params parsed from the route pattern
are returned.

If source equals C<query>, then only params parsed from the query string are
returned.

If source equals C<body>, then only params sent in the request body will be
returned.

If another value is given for C<$source>, then an exception is triggered.

=head1 EXTRA SPEED

If L<Dancer2::Core::Request> detects the following modules as installed,
it will use them to speed things up:

=over 4

=item * L<URL::Encode::XS>

=item * L<CGI::Deurl::XS>

=back

=head1 AUTHOR

Dancer Core Developers

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2022 by Alexis Sukrieh.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut