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.\" ========================================================================
.\"
.IX Title "Mojo::Headers 3pm"
.TH Mojo::Headers 3pm 2024-05-15 "perl v5.38.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH NAME
Mojo::Headers \- HTTP headers
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&  use Mojo::Headers;
\&
\&  # Parse
\&  my $headers = Mojo::Headers\->new;
\&  $headers\->parse("Content\-Length: 42\ex0d\ex0a");
\&  $headers\->parse("Content\-Type: text/html\ex0d\ex0a\ex0d\ex0a");
\&  say $headers\->content_length;
\&  say $headers\->content_type;
\&
\&  # Build
\&  my $headers = Mojo::Headers\->new;
\&  $headers\->content_length(42);
\&  $headers\->content_type(\*(Aqtext/plain\*(Aq);
\&  say $headers\->to_string;
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Mojo::Headers is a container for HTTP headers, based on RFC 7230 <https://tools.ietf.org/html/rfc7230> and RFC
7231 <https://tools.ietf.org/html/rfc7231>.
.SH ATTRIBUTES
.IX Header "ATTRIBUTES"
Mojo::Headers implements the following attributes.
.SS max_line_size
.IX Subsection "max_line_size"
.Vb 2
\&  my $size = $headers\->max_line_size;
\&  $headers = $headers\->max_line_size(1024);
.Ve
.PP
Maximum header line size in bytes, defaults to the value of the \f(CW\*(C`MOJO_MAX_LINE_SIZE\*(C'\fR environment variable or \f(CW8192\fR
(8KiB).
.SS max_lines
.IX Subsection "max_lines"
.Vb 2
\&  my $num  = $headers\->max_lines;
\&  $headers = $headers\->max_lines(200);
.Ve
.PP
Maximum number of header lines, defaults to the value of the \f(CW\*(C`MOJO_MAX_LINES\*(C'\fR environment variable or \f(CW100\fR.
.SH METHODS
.IX Header "METHODS"
Mojo::Headers inherits all methods from Mojo::Base and implements the following new ones.
.SS add
.IX Subsection "add"
.Vb 2
\&  $headers = $headers\->add(Foo => \*(Aqone value\*(Aq);
\&  $headers = $headers\->add(Foo => \*(Aqfirst value\*(Aq, \*(Aqsecond value\*(Aq);
.Ve
.PP
Add header with one or more lines.
.PP
.Vb 3
\&  # "Vary: Accept
\&  #  Vary: Accept\-Encoding"
\&  $headers\->add(Vary => \*(AqAccept\*(Aq)\->add(Vary => \*(AqAccept\-Encoding\*(Aq)\->to_string;
.Ve
.SS append
.IX Subsection "append"
.Vb 1
\&  $headers = $headers\->append(Vary => \*(AqAccept\-Encoding\*(Aq);
.Ve
.PP
Append value to header and flatten it if necessary.
.PP
.Vb 2
\&  # "Vary: Accept"
\&  $headers\->append(Vary => \*(AqAccept\*(Aq)\->to_string;
\&
\&  # "Vary: Accept, Accept\-Encoding"
\&  $headers\->vary(\*(AqAccept\*(Aq)\->append(Vary => \*(AqAccept\-Encoding\*(Aq)\->to_string;
.Ve
.SS clone
.IX Subsection "clone"
.Vb 1
\&  my $clone = $headers\->clone;
.Ve
.PP
Return a new Mojo::Headers object cloned from these headers.
.SS dehop
.IX Subsection "dehop"
.Vb 1
\&  $headers = $headers\->dehop;
.Ve
.PP
Remove hop-by-hop headers that should not be retransmitted.
.SS every_header
.IX Subsection "every_header"
.Vb 1
\&  my $all = $headers\->every_header(\*(AqLocation\*(Aq);
.Ve
.PP
Similar to "header", but returns all headers sharing the same name as an array reference.
.PP
.Vb 2
\&  # Get first header value
\&  say $headers\->every_header(\*(AqLocation\*(Aq)\->[0];
.Ve
.SS from_hash
.IX Subsection "from_hash"
.Vb 3
\&  $headers = $headers\->from_hash({\*(AqCookie\*(Aq => \*(Aqa=b\*(Aq});
\&  $headers = $headers\->from_hash({\*(AqCookie\*(Aq => [\*(Aqa=b\*(Aq, \*(Aqc=d\*(Aq]});
\&  $headers = $headers\->from_hash({});
.Ve
.PP
Parse headers from a hash reference, an empty hash removes all headers.
.SS header
.IX Subsection "header"
.Vb 3
\&  my $value = $headers\->header(\*(AqFoo\*(Aq);
\&  $headers  = $headers\->header(Foo => \*(Aqone value\*(Aq);
\&  $headers  = $headers\->header(Foo => \*(Aqfirst value\*(Aq, \*(Aqsecond value\*(Aq);
.Ve
.PP
Get or replace the current header values.
.SS is_finished
.IX Subsection "is_finished"
.Vb 1
\&  my $bool = $headers\->is_finished;
.Ve
.PP
Check if header parser is finished.
.SS is_limit_exceeded
.IX Subsection "is_limit_exceeded"
.Vb 1
\&  my $bool = $headers\->is_limit_exceeded;
.Ve
.PP
Check if headers have exceeded "max_line_size" or "max_lines".
.SS leftovers
.IX Subsection "leftovers"
.Vb 1
\&  my $bytes = $headers\->leftovers;
.Ve
.PP
Get and remove leftover data from header parser.
.SS names
.IX Subsection "names"
.Vb 1
\&  my $names = $headers\->names;
.Ve
.PP
Return an array reference with all currently defined headers.
.PP
.Vb 2
\&  # Names of all headers
\&  say for @{$headers\->names};
.Ve
.SS parse
.IX Subsection "parse"
.Vb 1
\&  $headers = $headers\->parse("Content\-Type: text/plain\ex0d\ex0a\ex0d\ex0a");
.Ve
.PP
Parse formatted headers.
.SS remove
.IX Subsection "remove"
.Vb 1
\&  $headers = $headers\->remove(\*(AqFoo\*(Aq);
.Ve
.PP
Remove a header.
.SS to_hash
.IX Subsection "to_hash"
.Vb 2
\&  my $single = $headers\->to_hash;
\&  my $multi  = $headers\->to_hash(1);
.Ve
.PP
Turn headers into hash reference, array references to represent multiple headers with the same name are disabled by
default.
.PP
.Vb 1
\&  say $headers\->to_hash\->{DNT};
.Ve
.SS to_string
.IX Subsection "to_string"
.Vb 1
\&  my $str = $headers\->to_string;
.Ve
.PP
Turn headers into a string, suitable for HTTP messages.
.SH "ADDITIONAL METHODS"
.IX Header "ADDITIONAL METHODS"
Additionally, the following shortcuts are available, for accessing and manipulating commonly-used headers:
.SS accept
.IX Subsection "accept"
.Vb 2
\&  my $accept = $headers\->accept;
\&  $headers   = $headers\->accept(\*(Aqapplication/json\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Accept\*(C'\fR header.
.SS accept_charset
.IX Subsection "accept_charset"
.Vb 2
\&  my $charset = $headers\->accept_charset;
\&  $headers    = $headers\->accept_charset(\*(AqUTF\-8\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Accept\-Charset\*(C'\fR header.
.SS accept_encoding
.IX Subsection "accept_encoding"
.Vb 2
\&  my $encoding = $headers\->accept_encoding;
\&  $headers     = $headers\->accept_encoding(\*(Aqgzip\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Accept\-Encoding\*(C'\fR header.
.SS accept_language
.IX Subsection "accept_language"
.Vb 2
\&  my $language = $headers\->accept_language;
\&  $headers     = $headers\->accept_language(\*(Aqde, en\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Accept\-Language\*(C'\fR header.
.SS accept_ranges
.IX Subsection "accept_ranges"
.Vb 2
\&  my $ranges = $headers\->accept_ranges;
\&  $headers   = $headers\->accept_ranges(\*(Aqbytes\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Accept\-Ranges\*(C'\fR header.
.SS access_control_allow_origin
.IX Subsection "access_control_allow_origin"
.Vb 2
\&  my $origin = $headers\->access_control_allow_origin;
\&  $headers   = $headers\->access_control_allow_origin(\*(Aq*\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Access\-Control\-Allow\-Origin\*(C'\fR header from Cross-Origin
Resource Sharing <https://www.w3.org/TR/cors/>.
.SS allow
.IX Subsection "allow"
.Vb 2
\&  my $allow = $headers\->allow;
\&  $headers  = $headers\->allow(\*(AqGET, POST\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Allow\*(C'\fR header.
.SS authorization
.IX Subsection "authorization"
.Vb 2
\&  my $authorization = $headers\->authorization;
\&  $headers          = $headers\->authorization(\*(AqBasic Zm9vOmJhcg==\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Authorization\*(C'\fR header.
.SS cache_control
.IX Subsection "cache_control"
.Vb 2
\&  my $cache_control = $headers\->cache_control;
\&  $headers          = $headers\->cache_control(\*(Aqmax\-age=1, no\-cache\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Cache\-Control\*(C'\fR header.
.SS connection
.IX Subsection "connection"
.Vb 2
\&  my $connection = $headers\->connection;
\&  $headers       = $headers\->connection(\*(Aqclose\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Connection\*(C'\fR header.
.SS content_disposition
.IX Subsection "content_disposition"
.Vb 2
\&  my $disposition = $headers\->content_disposition;
\&  $headers        = $headers\->content_disposition(\*(Aqfoo\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Content\-Disposition\*(C'\fR header.
.SS content_encoding
.IX Subsection "content_encoding"
.Vb 2
\&  my $encoding = $headers\->content_encoding;
\&  $headers     = $headers\->content_encoding(\*(Aqgzip\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Content\-Encoding\*(C'\fR header.
.SS content_language
.IX Subsection "content_language"
.Vb 2
\&  my $language = $headers\->content_language;
\&  $headers     = $headers\->content_language(\*(Aqen\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Content\-Language\*(C'\fR header.
.SS content_length
.IX Subsection "content_length"
.Vb 2
\&  my $len  = $headers\->content_length;
\&  $headers = $headers\->content_length(4000);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Content\-Length\*(C'\fR header.
.SS content_location
.IX Subsection "content_location"
.Vb 2
\&  my $location = $headers\->content_location;
\&  $headers     = $headers\->content_location(\*(Aqhttp://127.0.0.1/foo\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Content\-Location\*(C'\fR header.
.SS content_range
.IX Subsection "content_range"
.Vb 2
\&  my $range = $headers\->content_range;
\&  $headers  = $headers\->content_range(\*(Aqbytes 2\-8/100\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Content\-Range\*(C'\fR header.
.SS content_security_policy
.IX Subsection "content_security_policy"
.Vb 2
\&  my $policy = $headers\->content_security_policy;
\&  $headers   = $headers\->content_security_policy(\*(Aqdefault\-src https:\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Content\-Security\-Policy\*(C'\fR header from Content Security Policy
1.0 <https://www.w3.org/TR/CSP/>.
.SS content_type
.IX Subsection "content_type"
.Vb 2
\&  my $type = $headers\->content_type;
\&  $headers = $headers\->content_type(\*(Aqtext/plain\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Content\-Type\*(C'\fR header.
.SS cookie
.IX Subsection "cookie"
.Vb 2
\&  my $cookie = $headers\->cookie;
\&  $headers   = $headers\->cookie(\*(Aqf=b\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Cookie\*(C'\fR header from RFC
6265 <https://tools.ietf.org/html/rfc6265>.
.SS date
.IX Subsection "date"
.Vb 2
\&  my $date = $headers\->date;
\&  $headers = $headers\->date(\*(AqSun, 17 Aug 2008 16:27:35 GMT\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Date\*(C'\fR header.
.SS dnt
.IX Subsection "dnt"
.Vb 2
\&  my $dnt  = $headers\->dnt;
\&  $headers = $headers\->dnt(1);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`DNT\*(C'\fR (Do Not Track) header, which has no specification yet, but
is very commonly used.
.SS etag
.IX Subsection "etag"
.Vb 2
\&  my $etag = $headers\->etag;
\&  $headers = $headers\->etag(\*(Aq"abc321"\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`ETag\*(C'\fR header.
.SS expect
.IX Subsection "expect"
.Vb 2
\&  my $expect = $headers\->expect;
\&  $headers   = $headers\->expect(\*(Aq100\-continue\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Expect\*(C'\fR header.
.SS expires
.IX Subsection "expires"
.Vb 2
\&  my $expires = $headers\->expires;
\&  $headers    = $headers\->expires(\*(AqThu, 01 Dec 1994 16:00:00 GMT\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Expires\*(C'\fR header.
.SS host
.IX Subsection "host"
.Vb 2
\&  my $host = $headers\->host;
\&  $headers = $headers\->host(\*(Aq127.0.0.1\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Host\*(C'\fR header.
.SS if_modified_since
.IX Subsection "if_modified_since"
.Vb 2
\&  my $date = $headers\->if_modified_since;
\&  $headers = $headers\->if_modified_since(\*(AqSun, 17 Aug 2008 16:27:35 GMT\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`If\-Modified\-Since\*(C'\fR header.
.SS if_none_match
.IX Subsection "if_none_match"
.Vb 2
\&  my $etag = $headers\->if_none_match;
\&  $headers = $headers\->if_none_match(\*(Aq"abc321"\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`If\-None\-Match\*(C'\fR header.
.SS last_modified
.IX Subsection "last_modified"
.Vb 2
\&  my $date = $headers\->last_modified;
\&  $headers = $headers\->last_modified(\*(AqSun, 17 Aug 2008 16:27:35 GMT\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Last\-Modified\*(C'\fR header.
.SS link
.IX Subsection "link"
.Vb 2
\&  my $link = $headers\->link;
\&  $headers = $headers\->link(\*(Aq<http://127.0.0.1/foo/3>; rel="next"\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Link\*(C'\fR header from RFC
5988 <https://tools.ietf.org/html/rfc5988>.
.SS links
.IX Subsection "links"
.Vb 2
\&  my $links = $headers\->links;
\&  $headers  = $headers\->links({next => \*(Aqhttp://example.com/foo\*(Aq, prev => \*(Aqhttp://example.com/bar\*(Aq});
.Ve
.PP
Get or set web links from or to \f(CW\*(C`Link\*(C'\fR header according to RFC 5988 <http://tools.ietf.org/html/rfc5988>.
.PP
.Vb 3
\&  # Extract information about next page
\&  say $headers\->links\->{next}{link};
\&  say $headers\->links\->{next}{title};
.Ve
.SS location
.IX Subsection "location"
.Vb 2
\&  my $location = $headers\->location;
\&  $headers     = $headers\->location(\*(Aqhttp://127.0.0.1/foo\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Location\*(C'\fR header.
.SS origin
.IX Subsection "origin"
.Vb 2
\&  my $origin = $headers\->origin;
\&  $headers   = $headers\->origin(\*(Aqhttp://example.com\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Origin\*(C'\fR header from RFC
6454 <https://tools.ietf.org/html/rfc6454>.
.SS proxy_authenticate
.IX Subsection "proxy_authenticate"
.Vb 2
\&  my $authenticate = $headers\->proxy_authenticate;
\&  $headers         = $headers\->proxy_authenticate(\*(AqBasic "realm"\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Proxy\-Authenticate\*(C'\fR header.
.SS proxy_authorization
.IX Subsection "proxy_authorization"
.Vb 2
\&  my $authorization = $headers\->proxy_authorization;
\&  $headers          = $headers\->proxy_authorization(\*(AqBasic Zm9vOmJhcg==\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Proxy\-Authorization\*(C'\fR header.
.SS range
.IX Subsection "range"
.Vb 2
\&  my $range = $headers\->range;
\&  $headers  = $headers\->range(\*(Aqbytes=2\-8\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Range\*(C'\fR header.
.SS referer
.IX Subsection "referer"
.Vb 2
\&  my $referrer = $headers\->referer;
\&  $headers     = $headers\->referer(\*(Aqhttp://example.com\*(Aq);
.Ve
.PP
Alias for "referrer".
.SS referrer
.IX Subsection "referrer"
.Vb 2
\&  my $referrer = $headers\->referrer;
\&  $headers     = $headers\->referrer(\*(Aqhttp://example.com\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Referer\*(C'\fR header, there was a typo in RFC
2068 <https://tools.ietf.org/html/rfc2068> which resulted in \f(CW\*(C`Referer\*(C'\fR becoming an official header.
.SS sec_websocket_accept
.IX Subsection "sec_websocket_accept"
.Vb 2
\&  my $accept = $headers\->sec_websocket_accept;
\&  $headers   = $headers\->sec_websocket_accept(\*(Aqs3pPLMBiTxaQ9kYGzzhZRbK+xOo=\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Sec\-WebSocket\-Accept\*(C'\fR header from RFC
6455 <https://tools.ietf.org/html/rfc6455>.
.SS sec_websocket_extensions
.IX Subsection "sec_websocket_extensions"
.Vb 2
\&  my $extensions = $headers\->sec_websocket_extensions;
\&  $headers       = $headers\->sec_websocket_extensions(\*(Aqfoo\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Sec\-WebSocket\-Extensions\*(C'\fR header from RFC
6455 <https://tools.ietf.org/html/rfc6455>.
.SS sec_websocket_key
.IX Subsection "sec_websocket_key"
.Vb 2
\&  my $key  = $headers\->sec_websocket_key;
\&  $headers = $headers\->sec_websocket_key(\*(AqdGhlIHNhbXBsZSBub25jZQ==\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Sec\-WebSocket\-Key\*(C'\fR header from RFC
6455 <https://tools.ietf.org/html/rfc6455>.
.SS sec_websocket_protocol
.IX Subsection "sec_websocket_protocol"
.Vb 2
\&  my $proto = $headers\->sec_websocket_protocol;
\&  $headers  = $headers\->sec_websocket_protocol(\*(Aqsample\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Sec\-WebSocket\-Protocol\*(C'\fR header from RFC
6455 <https://tools.ietf.org/html/rfc6455>.
.SS sec_websocket_version
.IX Subsection "sec_websocket_version"
.Vb 2
\&  my $version = $headers\->sec_websocket_version;
\&  $headers    = $headers\->sec_websocket_version(13);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Sec\-WebSocket\-Version\*(C'\fR header from RFC
6455 <https://tools.ietf.org/html/rfc6455>.
.SS server
.IX Subsection "server"
.Vb 2
\&  my $server = $headers\->server;
\&  $headers   = $headers\->server(\*(AqMojo\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Server\*(C'\fR header.
.SS server_timing
.IX Subsection "server_timing"
.Vb 2
\&  my $timing = $headers\->server_timing;
\&  $headers   = $headers\->server_timing(\*(Aqapp;desc=Mojolicious;dur=0.0001\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Server\-Timing\*(C'\fR header from Server
Timing <https://www.w3.org/TR/server-timing/>.
.SS set_cookie
.IX Subsection "set_cookie"
.Vb 2
\&  my $cookie = $headers\->set_cookie;
\&  $headers   = $headers\->set_cookie(\*(Aqf=b; path=/\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Set\-Cookie\*(C'\fR header from RFC
6265 <https://tools.ietf.org/html/rfc6265>.
.SS status
.IX Subsection "status"
.Vb 2
\&  my $status = $headers\->status;
\&  $headers   = $headers\->status(\*(Aq200 OK\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Status\*(C'\fR header from RFC
3875 <https://tools.ietf.org/html/rfc3875>.
.SS strict_transport_security
.IX Subsection "strict_transport_security"
.Vb 2
\&  my $policy = $headers\->strict_transport_security;
\&  $headers   = $headers\->strict_transport_security(\*(Aqmax\-age=31536000\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Strict\-Transport\-Security\*(C'\fR header from RFC
6797 <https://tools.ietf.org/html/rfc6797>.
.SS te
.IX Subsection "te"
.Vb 2
\&  my $te   = $headers\->te;
\&  $headers = $headers\->te(\*(Aqchunked\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`TE\*(C'\fR header.
.SS trailer
.IX Subsection "trailer"
.Vb 2
\&  my $trailer = $headers\->trailer;
\&  $headers    = $headers\->trailer(\*(AqX\-Foo\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Trailer\*(C'\fR header.
.SS transfer_encoding
.IX Subsection "transfer_encoding"
.Vb 2
\&  my $encoding = $headers\->transfer_encoding;
\&  $headers     = $headers\->transfer_encoding(\*(Aqchunked\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Transfer\-Encoding\*(C'\fR header.
.SS upgrade
.IX Subsection "upgrade"
.Vb 2
\&  my $upgrade = $headers\->upgrade;
\&  $headers    = $headers\->upgrade(\*(Aqwebsocket\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Upgrade\*(C'\fR header.
.SS user_agent
.IX Subsection "user_agent"
.Vb 2
\&  my $agent = $headers\->user_agent;
\&  $headers  = $headers\->user_agent(\*(AqMojo/1.0\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`User\-Agent\*(C'\fR header.
.SS vary
.IX Subsection "vary"
.Vb 2
\&  my $vary = $headers\->vary;
\&  $headers = $headers\->vary(\*(Aq*\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`Vary\*(C'\fR header.
.SS www_authenticate
.IX Subsection "www_authenticate"
.Vb 2
\&  my $authenticate = $headers\->www_authenticate;
\&  $headers         = $headers\->www_authenticate(\*(AqBasic realm="realm"\*(Aq);
.Ve
.PP
Get or replace current header value, shortcut for the \f(CW\*(C`WWW\-Authenticate\*(C'\fR header.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Mojolicious, Mojolicious::Guides, <https://mojolicious.org>.