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.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.20) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(*W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is turned on, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. 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No user-serviceable parts. . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] \fP .\} .if t \{\ . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff .if n \{\ . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} .if t \{\ . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' .ds 8 \h'\*(#H'\(*b\h'-\*(#H' .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] .ds ae a\h'-(\w'a'u*4/10)'e .ds Ae A\h'-(\w'A'u*4/10)'E . \" corrections for vroff .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' . \" for low resolution devices (crt and lpr) .if \n(.H>23 .if \n(.V>19 \ \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} .rm #[ #] #H #V #F C .\" ======================================================================== .\" .IX Title "URI 3" .TH URI 3 "2004-11-05" "perl v5.16.3" "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" URI \- Uniform Resource Identifiers (absolute and relative) .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 5 \& $u1 = URI\->new("http://www.perl.com"); \& $u2 = URI\->new("foo", "http"); \& $u3 = $u2\->abs($u1); \& $u4 = $u3\->clone; \& $u5 = URI\->new("HTTP://WWW.perl.com:80")\->canonical; \& \& $str = $u\->as_string; \& $str = "$u"; \& \& $scheme = $u\->scheme; \& $opaque = $u\->opaque; \& $path = $u\->path; \& $frag = $u\->fragment; \& \& $u\->scheme("ftp"); \& $u\->host("ftp.perl.com"); \& $u\->path("cpan/"); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" This module implements the \f(CW\*(C`URI\*(C'\fR class. Objects of this class represent \*(L"Uniform Resource Identifier references\*(R" as specified in \s-1RFC\s0 2396 (and updated by \s-1RFC\s0 2732). .PP A Uniform Resource Identifier is a compact string of characters that identifies an abstract or physical resource. A Uniform Resource Identifier can be further classified as either a Uniform Resource Locator (\s-1URL\s0) or a Uniform Resource Name (\s-1URN\s0). The distinction between \s-1URL\s0 and \s-1URN\s0 does not matter to the \f(CW\*(C`URI\*(C'\fR class interface. A \&\*(L"URI-reference\*(R" is a \s-1URI\s0 that may have additional information attached in the form of a fragment identifier. .PP An absolute \s-1URI\s0 reference consists of three parts: a \fIscheme\fR, a \&\fIscheme-specific part\fR and a \fIfragment\fR identifier. A subset of \s-1URI\s0 references share a common syntax for hierarchical namespaces. For these, the scheme-specific part is further broken down into \&\fIauthority\fR, \fIpath\fR and \fIquery\fR components. These URIs can also take the form of relative \s-1URI\s0 references, where the scheme (and usually also the authority) component is missing, but implied by the context of the \s-1URI\s0 reference. The three forms of \s-1URI\s0 reference syntax are summarized as follows: .PP .Vb 3 \& <scheme>:<scheme\-specific\-part>#<fragment> \& <scheme>://<authority><path>?<query>#<fragment> \& <path>?<query>#<fragment> .Ve .PP The components into which a \s-1URI\s0 reference can be divided depend on the \&\fIscheme\fR. The \f(CW\*(C`URI\*(C'\fR class provides methods to get and set the individual components. The methods available for a specific \&\f(CW\*(C`URI\*(C'\fR object depend on the scheme. .SH "CONSTRUCTORS" .IX Header "CONSTRUCTORS" The following methods construct new \f(CW\*(C`URI\*(C'\fR objects: .ie n .IP "$uri = \s-1URI\-\s0>new( $str )" 4 .el .IP "\f(CW$uri\fR = \s-1URI\-\s0>new( \f(CW$str\fR )" 4 .IX Item "$uri = URI->new( $str )" .PD 0 .ie n .IP "$uri = \s-1URI\-\s0>new( $str, $scheme )" 4 .el .IP "\f(CW$uri\fR = \s-1URI\-\s0>new( \f(CW$str\fR, \f(CW$scheme\fR )" 4 .IX Item "$uri = URI->new( $str, $scheme )" .PD Constructs a new \s-1URI\s0 object. The string representation of a \s-1URI\s0 is given as argument, together with an optional scheme specification. Common \s-1URI\s0 wrappers like "" and <>, as well as leading and trailing white space, are automatically removed from the \f(CW$str\fR argument before it is processed further. .Sp The constructor determines the scheme, maps this to an appropriate \&\s-1URI\s0 subclass, constructs a new object of that class and returns it. .Sp The \f(CW$scheme\fR argument is only used when \f(CW$str\fR is a relative \s-1URI\s0. It can be either a simple string that denotes the scheme, a string containing an absolute \s-1URI\s0 reference, or an absolute \f(CW\*(C`URI\*(C'\fR object. If no \f(CW$scheme\fR is specified for a relative \&\s-1URI\s0 \f(CW$str\fR, then \f(CW$str\fR is simply treated as a generic \s-1URI\s0 (no scheme-specific methods available). .Sp The set of characters available for building \s-1URI\s0 references is restricted (see URI::Escape). Characters outside this set are automatically escaped by the \s-1URI\s0 constructor. .ie n .IP "$uri = \s-1URI\-\s0>new_abs( $str, $base_uri )" 4 .el .IP "\f(CW$uri\fR = \s-1URI\-\s0>new_abs( \f(CW$str\fR, \f(CW$base_uri\fR )" 4 .IX Item "$uri = URI->new_abs( $str, $base_uri )" Constructs a new absolute \s-1URI\s0 object. The \f(CW$str\fR argument can denote a relative or absolute \s-1URI\s0. If relative, then it is absolutized using \f(CW$base_uri\fR as base. The \f(CW$base_uri\fR must be an absolute \&\s-1URI\s0. .ie n .IP "$uri = URI::file\->new( $filename )" 4 .el .IP "\f(CW$uri\fR = URI::file\->new( \f(CW$filename\fR )" 4 .IX Item "$uri = URI::file->new( $filename )" .PD 0 .ie n .IP "$uri = URI::file\->new( $filename, $os )" 4 .el .IP "\f(CW$uri\fR = URI::file\->new( \f(CW$filename\fR, \f(CW$os\fR )" 4 .IX Item "$uri = URI::file->new( $filename, $os )" .PD Constructs a new \fIfile\fR \s-1URI\s0 from a file name. See URI::file. .ie n .IP "$uri = URI::file\->new_abs( $filename )" 4 .el .IP "\f(CW$uri\fR = URI::file\->new_abs( \f(CW$filename\fR )" 4 .IX Item "$uri = URI::file->new_abs( $filename )" .PD 0 .ie n .IP "$uri = URI::file\->new_abs( $filename, $os )" 4 .el .IP "\f(CW$uri\fR = URI::file\->new_abs( \f(CW$filename\fR, \f(CW$os\fR )" 4 .IX Item "$uri = URI::file->new_abs( $filename, $os )" .PD Constructs a new absolute \fIfile\fR \s-1URI\s0 from a file name. See URI::file. .ie n .IP "$uri = URI::file\->cwd" 4 .el .IP "\f(CW$uri\fR = URI::file\->cwd" 4 .IX Item "$uri = URI::file->cwd" Returns the current working directory as a \fIfile\fR \s-1URI\s0. See URI::file. .ie n .IP "$uri\->clone" 4 .el .IP "\f(CW$uri\fR\->clone" 4 .IX Item "$uri->clone" Returns a copy of the \f(CW$uri\fR. .SH "COMMON METHODS" .IX Header "COMMON METHODS" The methods described in this section are available for all \f(CW\*(C`URI\*(C'\fR objects. .PP Methods that give access to components of a \s-1URI\s0 always return the old value of the component. The value returned is \f(CW\*(C`undef\*(C'\fR if the component was not present. There is generally a difference between a component that is empty (represented as \f(CW""\fR) and a component that is missing (represented as \f(CW\*(C`undef\*(C'\fR). If an accessor method is given an argument, it updates the corresponding component in addition to returning the old value of the component. Passing an undefined argument removes the component (if possible). The description of each accessor method indicates whether the component is passed as an escaped or an unescaped string. A component that can be further divided into sub-parts are usually passed escaped, as unescaping might change its semantics. .PP The common methods available for all \s-1URI\s0 are: .ie n .IP "$uri\->scheme" 4 .el .IP "\f(CW$uri\fR\->scheme" 4 .IX Item "$uri->scheme" .PD 0 .ie n .IP "$uri\->scheme( $new_scheme )" 4 .el .IP "\f(CW$uri\fR\->scheme( \f(CW$new_scheme\fR )" 4 .IX Item "$uri->scheme( $new_scheme )" .PD Sets and returns the scheme part of the \f(CW$uri\fR. If the \f(CW$uri\fR is relative, then \f(CW$uri\fR\->scheme returns \f(CW\*(C`undef\*(C'\fR. If called with an argument, it updates the scheme of \f(CW$uri\fR, possibly changing the class of \f(CW$uri\fR, and returns the old scheme value. The method croaks if the new scheme name is illegal; a scheme name must begin with a letter and must consist of only US-ASCII letters, numbers, and a few special marks: \*(L".\*(R", \*(L"+\*(R", \*(L"\-\*(R". This restriction effectively means that the scheme must be passed unescaped. Passing an undefined argument to the scheme method makes the \s-1URI\s0 relative (if possible). .Sp Letter case does not matter for scheme names. The string returned by \f(CW$uri\fR\->scheme is always lowercase. If you want the scheme just as it was written in the \s-1URI\s0 in its original case, you can use the \f(CW$uri\fR\->_scheme method instead. .ie n .IP "$uri\->opaque" 4 .el .IP "\f(CW$uri\fR\->opaque" 4 .IX Item "$uri->opaque" .PD 0 .ie n .IP "$uri\->opaque( $new_opaque )" 4 .el .IP "\f(CW$uri\fR\->opaque( \f(CW$new_opaque\fR )" 4 .IX Item "$uri->opaque( $new_opaque )" .PD Sets and returns the scheme-specific part of the \f(CW$uri\fR (everything between the scheme and the fragment) as an escaped string. .ie n .IP "$uri\->path" 4 .el .IP "\f(CW$uri\fR\->path" 4 .IX Item "$uri->path" .PD 0 .ie n .IP "$uri\->path( $new_path )" 4 .el .IP "\f(CW$uri\fR\->path( \f(CW$new_path\fR )" 4 .IX Item "$uri->path( $new_path )" .PD Sets and returns the same value as \f(CW$uri\fR\->opaque unless the \s-1URI\s0 supports the generic syntax for hierarchical namespaces. In that case the generic method is overridden to set and return the part of the \s-1URI\s0 between the \fIhost name\fR and the \fIfragment\fR. .ie n .IP "$uri\->fragment" 4 .el .IP "\f(CW$uri\fR\->fragment" 4 .IX Item "$uri->fragment" .PD 0 .ie n .IP "$uri\->fragment( $new_frag )" 4 .el .IP "\f(CW$uri\fR\->fragment( \f(CW$new_frag\fR )" 4 .IX Item "$uri->fragment( $new_frag )" .PD Returns the fragment identifier of a \s-1URI\s0 reference as an escaped string. .ie n .IP "$uri\->as_string" 4 .el .IP "\f(CW$uri\fR\->as_string" 4 .IX Item "$uri->as_string" Returns a \s-1URI\s0 object to a plain string. \s-1URI\s0 objects are also converted to plain strings automatically by overloading. This means that \f(CW$uri\fR objects can be used as plain strings in most Perl constructs. .ie n .IP "$uri\->canonical" 4 .el .IP "\f(CW$uri\fR\->canonical" 4 .IX Item "$uri->canonical" Returns a normalized version of the \s-1URI\s0. The rules for normalization are scheme-dependent. They usually involve lowercasing the scheme and Internet host name components, removing the explicit port specification if it matches the default port, uppercasing all escape sequences, and unescaping octets that can be better represented as plain characters. .Sp For efficiency reasons, if the \f(CW$uri\fR is already in normalized form, then a reference to it is returned instead of a copy. .ie n .IP "$uri\->eq( $other_uri )" 4 .el .IP "\f(CW$uri\fR\->eq( \f(CW$other_uri\fR )" 4 .IX Item "$uri->eq( $other_uri )" .PD 0 .ie n .IP "URI::eq( $first_uri, $other_uri )" 4 .el .IP "URI::eq( \f(CW$first_uri\fR, \f(CW$other_uri\fR )" 4 .IX Item "URI::eq( $first_uri, $other_uri )" .PD Tests whether two \s-1URI\s0 references are equal. \s-1URI\s0 references that normalize to the same string are considered equal. The method can also be used as a plain function which can also test two string arguments. .Sp If you need to test whether two \f(CW\*(C`URI\*(C'\fR object references denote the same object, use the '==' operator. .ie n .IP "$uri\->abs( $base_uri )" 4 .el .IP "\f(CW$uri\fR\->abs( \f(CW$base_uri\fR )" 4 .IX Item "$uri->abs( $base_uri )" Returns an absolute \s-1URI\s0 reference. If \f(CW$uri\fR is already absolute, then a reference to it is simply returned. If the \f(CW$uri\fR is relative, then a new absolute \s-1URI\s0 is constructed by combining the \&\f(CW$uri\fR and the \f(CW$base_uri\fR, and returned. .ie n .IP "$uri\->rel( $base_uri )" 4 .el .IP "\f(CW$uri\fR\->rel( \f(CW$base_uri\fR )" 4 .IX Item "$uri->rel( $base_uri )" Returns a relative \s-1URI\s0 reference if it is possible to make one that denotes the same resource relative to \f(CW$base_uri\fR. If not, then \f(CW$uri\fR is simply returned. .SH "GENERIC METHODS" .IX Header "GENERIC METHODS" The following methods are available to schemes that use the common/generic syntax for hierarchical namespaces. The descriptions of schemes below indicate which these are. Unknown schemes are assumed to support the generic syntax, and therefore the following methods: .ie n .IP "$uri\->authority" 4 .el .IP "\f(CW$uri\fR\->authority" 4 .IX Item "$uri->authority" .PD 0 .ie n .IP "$uri\->authority( $new_authority )" 4 .el .IP "\f(CW$uri\fR\->authority( \f(CW$new_authority\fR )" 4 .IX Item "$uri->authority( $new_authority )" .PD Sets and returns the escaped authority component of the \f(CW$uri\fR. .ie n .IP "$uri\->path" 4 .el .IP "\f(CW$uri\fR\->path" 4 .IX Item "$uri->path" .PD 0 .ie n .IP "$uri\->path( $new_path )" 4 .el .IP "\f(CW$uri\fR\->path( \f(CW$new_path\fR )" 4 .IX Item "$uri->path( $new_path )" .PD Sets and returns the escaped path component of the \f(CW$uri\fR (the part between the host name and the query or fragment). The path can never be undefined, but it can be the empty string. .ie n .IP "$uri\->path_query" 4 .el .IP "\f(CW$uri\fR\->path_query" 4 .IX Item "$uri->path_query" .PD 0 .ie n .IP "$uri\->path_query( $new_path_query )" 4 .el .IP "\f(CW$uri\fR\->path_query( \f(CW$new_path_query\fR )" 4 .IX Item "$uri->path_query( $new_path_query )" .PD Sets and returns the escaped path and query components as a single entity. The path and the query are separated by a \*(L"?\*(R" character, but the query can itself contain \*(L"?\*(R". .ie n .IP "$uri\->path_segments" 4 .el .IP "\f(CW$uri\fR\->path_segments" 4 .IX Item "$uri->path_segments" .PD 0 .ie n .IP "$uri\->path_segments( $segment, ... )" 4 .el .IP "\f(CW$uri\fR\->path_segments( \f(CW$segment\fR, ... )" 4 .IX Item "$uri->path_segments( $segment, ... )" .PD Sets and returns the path. In a scalar context, it returns the same value as \f(CW$uri\fR\->path. In a list context, it returns the unescaped path segments that make up the path. Path segments that have parameters are returned as an anonymous array. The first element is the unescaped path segment proper; subsequent elements are escaped parameter strings. Such an anonymous array uses overloading so it can be treated as a string too, but this string does not include the parameters. .Sp Note that absolute paths have the empty string as their first \&\fIpath_segment\fR, i.e. the \fIpath\fR \f(CW\*(C`/foo/bar\*(C'\fR have 3 \&\fIpath_segments\fR; "\*(L", \*(R"foo\*(L" and \*(R"bar". .ie n .IP "$uri\->query" 4 .el .IP "\f(CW$uri\fR\->query" 4 .IX Item "$uri->query" .PD 0 .ie n .IP "$uri\->query( $new_query )" 4 .el .IP "\f(CW$uri\fR\->query( \f(CW$new_query\fR )" 4 .IX Item "$uri->query( $new_query )" .PD Sets and returns the escaped query component of the \f(CW$uri\fR. .ie n .IP "$uri\->query_form" 4 .el .IP "\f(CW$uri\fR\->query_form" 4 .IX Item "$uri->query_form" .PD 0 .ie n .IP "$uri\->query_form( $key1 => $val1, $key2 => $val2, ... )" 4 .el .IP "\f(CW$uri\fR\->query_form( \f(CW$key1\fR => \f(CW$val1\fR, \f(CW$key2\fR => \f(CW$val2\fR, ... )" 4 .IX Item "$uri->query_form( $key1 => $val1, $key2 => $val2, ... )" .ie n .IP "$uri\->query_form( \e@key_value_pairs )" 4 .el .IP "\f(CW$uri\fR\->query_form( \e@key_value_pairs )" 4 .IX Item "$uri->query_form( @key_value_pairs )" .ie n .IP "$uri\->query_form( \e%hash )" 4 .el .IP "\f(CW$uri\fR\->query_form( \e%hash )" 4 .IX Item "$uri->query_form( %hash )" .PD Sets and returns query components that use the \&\fIapplication/x\-www\-form\-urlencoded\fR format. Key/value pairs are separated by \*(L"&\*(R", and the key is separated from the value by a \*(L"=\*(R" character. .Sp The form can be set either by passing separate key/value pairs, or via an array or hash reference. Passing an empty array or an empty hash removes the query component, whereas passing no arguments at all leaves the component unchanged. The order of keys is undefined if a hash reference is passed. The old value is always returned as a list of separate key/value pairs. Assigning this list to a hash is unwise as the keys returned might repeat. .Sp The values passed when setting the form can be plain strings or references to arrays of strings. Passing an array of values has the same effect as passing the key repeatedly with one value at a time. All the following statements have the same effect: .Sp .Vb 5 \& $uri\->query_form(foo => 1, foo => 2); \& $uri\->query_form(foo => [1, 2]); \& $uri\->query_form([ foo => 1, foo => 2 ]); \& $uri\->query_form([ foo => [1, 2] ]); \& $uri\->query_form({ foo => [1, 2] }); .Ve .Sp The \f(CW\*(C`URI::QueryParam\*(C'\fR module can be loaded to add further methods to manipulate the form of a \s-1URI\s0. See URI::QueryParam for details. .ie n .IP "$uri\->query_keywords" 4 .el .IP "\f(CW$uri\fR\->query_keywords" 4 .IX Item "$uri->query_keywords" .PD 0 .ie n .IP "$uri\->query_keywords( $keywords, ... )" 4 .el .IP "\f(CW$uri\fR\->query_keywords( \f(CW$keywords\fR, ... )" 4 .IX Item "$uri->query_keywords( $keywords, ... )" .ie n .IP "$uri\->query_keywords( \e@keywords )" 4 .el .IP "\f(CW$uri\fR\->query_keywords( \e@keywords )" 4 .IX Item "$uri->query_keywords( @keywords )" .PD Sets and returns query components that use the keywords separated by \*(L"+\*(R" format. .Sp The keywords can be set either by passing separate keywords directly or by passing a reference to an array of keywords. Passing an empty array removes the query component, whereas passing no arguments at all leaves the component unchanged. The old value is always returned as a list of separate words. .SH "SERVER METHODS" .IX Header "SERVER METHODS" For schemes where the \fIauthority\fR component denotes an Internet host, the following methods are available in addition to the generic methods. .ie n .IP "$uri\->userinfo" 4 .el .IP "\f(CW$uri\fR\->userinfo" 4 .IX Item "$uri->userinfo" .PD 0 .ie n .IP "$uri\->userinfo( $new_userinfo )" 4 .el .IP "\f(CW$uri\fR\->userinfo( \f(CW$new_userinfo\fR )" 4 .IX Item "$uri->userinfo( $new_userinfo )" .PD Sets and returns the escaped userinfo part of the authority component. .Sp For some schemes this is a user name and a password separated by a colon. This practice is not recommended. Embedding passwords in clear text (such as \s-1URI\s0) has proven to be a security risk in almost every case where it has been used. .ie n .IP "$uri\->host" 4 .el .IP "\f(CW$uri\fR\->host" 4 .IX Item "$uri->host" .PD 0 .ie n .IP "$uri\->host( $new_host )" 4 .el .IP "\f(CW$uri\fR\->host( \f(CW$new_host\fR )" 4 .IX Item "$uri->host( $new_host )" .PD Sets and returns the unescaped hostname. .Sp If the \f(CW$new_host\fR string ends with a colon and a number, then this number also sets the port. .ie n .IP "$uri\->port" 4 .el .IP "\f(CW$uri\fR\->port" 4 .IX Item "$uri->port" .PD 0 .ie n .IP "$uri\->port( $new_port )" 4 .el .IP "\f(CW$uri\fR\->port( \f(CW$new_port\fR )" 4 .IX Item "$uri->port( $new_port )" .PD Sets and returns the port. The port is a simple integer that should be greater than 0. .Sp If a port is not specified explicitly in the \s-1URI\s0, then the \s-1URI\s0 scheme's default port is returned. If you don't want the default port substituted, then you can use the \f(CW$uri\fR\->_port method instead. .ie n .IP "$uri\->host_port" 4 .el .IP "\f(CW$uri\fR\->host_port" 4 .IX Item "$uri->host_port" .PD 0 .ie n .IP "$uri\->host_port( $new_host_port )" 4 .el .IP "\f(CW$uri\fR\->host_port( \f(CW$new_host_port\fR )" 4 .IX Item "$uri->host_port( $new_host_port )" .PD Sets and returns the host and port as a single unit. The returned value includes a port, even if it matches the default port. The host part and the port part are separated by a colon: \*(L":\*(R". .ie n .IP "$uri\->default_port" 4 .el .IP "\f(CW$uri\fR\->default_port" 4 .IX Item "$uri->default_port" Returns the default port of the \s-1URI\s0 scheme to which \f(CW$uri\fR belongs. For \fIhttp\fR this is the number 80, for \fIftp\fR this is the number 21, etc. The default port for a scheme can not be changed. .SH "SCHEME-SPECIFIC SUPPORT" .IX Header "SCHEME-SPECIFIC SUPPORT" Scheme-specific support is provided for the following \s-1URI\s0 schemes. For \f(CW\*(C`URI\*(C'\fR objects that do not belong to one of these, you can only use the common and generic methods. .IP "\fBdata\fR:" 4 .IX Item "data:" The \fIdata\fR \s-1URI\s0 scheme is specified in \s-1RFC\s0 2397. It allows inclusion of small data items as \*(L"immediate\*(R" data, as if it had been included externally. .Sp \&\f(CW\*(C`URI\*(C'\fR objects belonging to the data scheme support the common methods and two new methods to access their scheme-specific components: \&\f(CW$uri\fR\->media_type and \f(CW$uri\fR\->data. See URI::data for details. .IP "\fBfile\fR:" 4 .IX Item "file:" An old specification of the \fIfile\fR \s-1URI\s0 scheme is found in \s-1RFC\s0 1738. A new \s-1RFC\s0 2396 based specification in not available yet, but file \s-1URI\s0 references are in common use. .Sp \&\f(CW\*(C`URI\*(C'\fR objects belonging to the file scheme support the common and generic methods. In addition, they provide two methods for mapping file URIs back to local file names; \f(CW$uri\fR\->file and \f(CW$uri\fR\->dir. See URI::file for details. .IP "\fBftp\fR:" 4 .IX Item "ftp:" An old specification of the \fIftp\fR \s-1URI\s0 scheme is found in \s-1RFC\s0 1738. A new \s-1RFC\s0 2396 based specification in not available yet, but ftp \s-1URI\s0 references are in common use. .Sp \&\f(CW\*(C`URI\*(C'\fR objects belonging to the ftp scheme support the common, generic and server methods. In addition, they provide two methods for accessing the userinfo sub-components: \f(CW$uri\fR\->user and \f(CW$uri\fR\->password. .IP "\fBgopher\fR:" 4 .IX Item "gopher:" The \fIgopher\fR \s-1URI\s0 scheme is specified in <draft\-murali\-url\-gopher\-1996\-12\-04> and will hopefully be available as a \s-1RFC\s0 2396 based specification. .Sp \&\f(CW\*(C`URI\*(C'\fR objects belonging to the gopher scheme support the common, generic and server methods. In addition, they support some methods for accessing gopher-specific path components: \f(CW$uri\fR\->gopher_type, \&\f(CW$uri\fR\->selector, \f(CW$uri\fR\->search, \f(CW$uri\fR\->string. .IP "\fBhttp\fR:" 4 .IX Item "http:" The \fIhttp\fR \s-1URI\s0 scheme is specified in \s-1RFC\s0 2616. The scheme is used to reference resources hosted by \s-1HTTP\s0 servers. .Sp \&\f(CW\*(C`URI\*(C'\fR objects belonging to the http scheme support the common, generic and server methods. .IP "\fBhttps\fR:" 4 .IX Item "https:" The \fIhttps\fR \s-1URI\s0 scheme is a Netscape invention which is commonly implemented. The scheme is used to reference \s-1HTTP\s0 servers through \s-1SSL\s0 connections. Its syntax is the same as http, but the default port is different. .IP "\fBldap\fR:" 4 .IX Item "ldap:" The \fIldap\fR \s-1URI\s0 scheme is specified in \s-1RFC\s0 2255. \s-1LDAP\s0 is the Lightweight Directory Access Protocol. An ldap \s-1URI\s0 describes an \s-1LDAP\s0 search operation to perform to retrieve information from an \s-1LDAP\s0 directory. .Sp \&\f(CW\*(C`URI\*(C'\fR objects belonging to the ldap scheme support the common, generic and server methods as well as ldap-specific methods: \f(CW$uri\fR\->dn, \&\f(CW$uri\fR\->attributes, \f(CW$uri\fR\->scope, \f(CW$uri\fR\->filter, \f(CW$uri\fR\->extensions. See URI::ldap for details. .IP "\fBldapi\fR:" 4 .IX Item "ldapi:" Like the \fIldap\fR \s-1URI\s0 scheme, but uses a \s-1UNIX\s0 domain socket. The server methods are not supported, and the local socket path is available as \f(CW$uri\fR\->un_path. The \fIldapi\fR scheme is used by the OpenLDAP package. There is no real specification for it, but it is mentioned in various OpenLDAP manual pages. .IP "\fBldaps\fR:" 4 .IX Item "ldaps:" Like the \fIldap\fR \s-1URI\s0 scheme, but uses an \s-1SSL\s0 connection. This scheme is deprecated, as the preferred way is to use the \fIstart_tls\fR mechanism. .IP "\fBmailto\fR:" 4 .IX Item "mailto:" The \fImailto\fR \s-1URI\s0 scheme is specified in \s-1RFC\s0 2368. The scheme was originally used to designate the Internet mailing address of an individual or service. It has (in \s-1RFC\s0 2368) been extended to allow setting of other mail header fields and the message body. .Sp \&\f(CW\*(C`URI\*(C'\fR objects belonging to the mailto scheme support the common methods and the generic query methods. In addition, they support the following mailto-specific methods: \f(CW$uri\fR\->to, \f(CW$uri\fR\->headers. .IP "\fBmms\fR:" 4 .IX Item "mms:" The \fImms\fR \s-1URL\s0 specification can be found at <http://sdp.ppona.com/> \&\f(CW\*(C`URI\*(C'\fR objects belonging to the mms scheme support the common, generic, and server methods, with the exception of userinfo and query-related sub-components. .IP "\fBnews\fR:" 4 .IX Item "news:" The \fInews\fR, \fInntp\fR and \fIsnews\fR \s-1URI\s0 schemes are specified in <draft\-gilman\-news\-url\-01> and will hopefully be available as an \s-1RFC\s0 2396 based specification soon. .Sp \&\f(CW\*(C`URI\*(C'\fR objects belonging to the news scheme support the common, generic and server methods. In addition, they provide some methods to access the path: \f(CW$uri\fR\->group and \f(CW$uri\fR\->message. .IP "\fBnntp\fR:" 4 .IX Item "nntp:" See \fInews\fR scheme. .IP "\fBpop\fR:" 4 .IX Item "pop:" The \fIpop\fR \s-1URI\s0 scheme is specified in \s-1RFC\s0 2384. The scheme is used to reference a \s-1POP3\s0 mailbox. .Sp \&\f(CW\*(C`URI\*(C'\fR objects belonging to the pop scheme support the common, generic and server methods. In addition, they provide two methods to access the userinfo components: \f(CW$uri\fR\->user and \f(CW$uri\fR\->auth .IP "\fBrlogin\fR:" 4 .IX Item "rlogin:" An old specification of the \fIrlogin\fR \s-1URI\s0 scheme is found in \s-1RFC\s0 1738. \f(CW\*(C`URI\*(C'\fR objects belonging to the rlogin scheme support the common, generic and server methods. .IP "\fBrtsp\fR:" 4 .IX Item "rtsp:" The \fIrtsp\fR \s-1URL\s0 specification can be found in section 3.2 of \s-1RFC\s0 2326. \&\f(CW\*(C`URI\*(C'\fR objects belonging to the rtsp scheme support the common, generic, and server methods, with the exception of userinfo and query-related sub-components. .IP "\fBrtspu\fR:" 4 .IX Item "rtspu:" The \fIrtspu\fR \s-1URI\s0 scheme is used to talk to \s-1RTSP\s0 servers over \s-1UDP\s0 instead of \s-1TCP\s0. The syntax is the same as rtsp. .IP "\fBrsync\fR:" 4 .IX Item "rsync:" Information about rsync is available from http://rsync.samba.org. \&\f(CW\*(C`URI\*(C'\fR objects belonging to the rsync scheme support the common, generic and server methods. In addition, they provide methods to access the userinfo sub-components: \f(CW$uri\fR\->user and \f(CW$uri\fR\->password. .IP "\fBsip\fR:" 4 .IX Item "sip:" The \fIsip\fR \s-1URI\s0 specification is described in sections 19.1 and 25 of \s-1RFC\s0 3261. \f(CW\*(C`URI\*(C'\fR objects belonging to the sip scheme support the common, generic, and server methods with the exception of path related sub-components. In addition, they provide two methods to get and set \&\fIsip\fR parameters: \f(CW$uri\fR\->params_form and \f(CW$uri\fR\->params. .IP "\fBsips\fR:" 4 .IX Item "sips:" See \fIsip\fR scheme. Its syntax is the same as sip, but the default port is different. .IP "\fBsnews\fR:" 4 .IX Item "snews:" See \fInews\fR scheme. Its syntax is the same as news, but the default port is different. .IP "\fBtelnet\fR:" 4 .IX Item "telnet:" An old specification of the \fItelnet\fR \s-1URI\s0 scheme is found in \s-1RFC\s0 1738. \f(CW\*(C`URI\*(C'\fR objects belonging to the telnet scheme support the common, generic and server methods. .IP "\fBtn3270\fR:" 4 .IX Item "tn3270:" These URIs are used like \fItelnet\fR URIs but for connections to \s-1IBM\s0 mainframes. \f(CW\*(C`URI\*(C'\fR objects belonging to the tn3270 scheme support the common, generic and server methods. .IP "\fBssh\fR:" 4 .IX Item "ssh:" Information about ssh is available at http://www.openssh.com/. \&\f(CW\*(C`URI\*(C'\fR objects belonging to the ssh scheme support the common, generic and server methods. In addition, they provide methods to access the userinfo sub-components: \f(CW$uri\fR\->user and \f(CW$uri\fR\->password. .IP "\fBurn\fR:" 4 .IX Item "urn:" The syntax of Uniform Resource Names is specified in \s-1RFC\s0 2141. \f(CW\*(C`URI\*(C'\fR objects belonging to the urn scheme provide the common methods, and also the methods \f(CW$uri\fR\->nid and \f(CW$uri\fR\->nss, which return the Namespace Identifier and the Namespace-Specific String respectively. .Sp The Namespace Identifier basically works like the Scheme identifier of URIs, and further divides the \s-1URN\s0 namespace. Namespace Identifier assignments are maintained at <http://www.iana.org/assignments/urn\-namespaces>. .Sp Letter case is not significant for the Namespace Identifier. It is always returned in lower case by the \f(CW$uri\fR\->nid method. The \f(CW$uri\fR\->_nid method can be used if you want it in its original case. .IP "\fBurn\fR:\fBisbn\fR:" 4 .IX Item "urn:isbn:" The \f(CW\*(C`urn:isbn:\*(C'\fR namespace contains International Standard Book Numbers (ISBNs) and is described in \s-1RFC\s0 3187. A \f(CW\*(C`URI\*(C'\fR object belonging to this namespace has the following extra methods (if the Business::ISBN module is available): \f(CW$uri\fR\->isbn, \&\f(CW$uri\fR\->isbn_publisher_code, \f(CW$uri\fR\->isbn_country_code, \f(CW$uri\fR\->isbn_as_ean. .IP "\fBurn\fR:\fBoid\fR:" 4 .IX Item "urn:oid:" The \f(CW\*(C`urn:oid:\*(C'\fR namespace contains Object Identifiers (OIDs) and is described in \s-1RFC\s0 3061. An object identifier consists of sequences of digits separated by dots. A \f(CW\*(C`URI\*(C'\fR object belonging to this namespace has an additional method called \f(CW$uri\fR\->oid that can be used to get/set the oid value. In a list context, oid numbers are returned as separate elements. .SH "CONFIGURATION VARIABLES" .IX Header "CONFIGURATION VARIABLES" The following configuration variables influence how the class and its methods behave: .ie n .IP "$URI::ABS_ALLOW_RELATIVE_SCHEME" 4 .el .IP "\f(CW$URI::ABS_ALLOW_RELATIVE_SCHEME\fR" 4 .IX Item "$URI::ABS_ALLOW_RELATIVE_SCHEME" Some older parsers used to allow the scheme name to be present in the relative \s-1URL\s0 if it was the same as the base \s-1URL\s0 scheme. \s-1RFC\s0 2396 says that this should be avoided, but you can enable this old behaviour by setting the \f(CW$URI::ABS_ALLOW_RELATIVE_SCHEME\fR variable to a \s-1TRUE\s0 value. The difference is demonstrated by the following examples: .Sp .Vb 2 \& URI\->new("http:foo")\->abs("http://host/a/b") \& ==> "http:foo" \& \& local $URI::ABS_ALLOW_RELATIVE_SCHEME = 1; \& URI\->new("http:foo")\->abs("http://host/a/b") \& ==> "http:/host/a/foo" .Ve .ie n .IP "$URI::ABS_REMOTE_LEADING_DOTS" 4 .el .IP "\f(CW$URI::ABS_REMOTE_LEADING_DOTS\fR" 4 .IX Item "$URI::ABS_REMOTE_LEADING_DOTS" You can also have the \fIabs()\fR method ignore excess \*(L"..\*(R" segments in the relative \s-1URI\s0 by setting \f(CW$URI::ABS_REMOTE_LEADING_DOTS\fR to a \s-1TRUE\s0 value. The difference is demonstrated by the following examples: .Sp .Vb 2 \& URI\->new("../../../foo")\->abs("http://host/a/b") \& ==> "http://host/../../foo" \& \& local $URI::ABS_REMOTE_LEADING_DOTS = 1; \& URI\->new("../../../foo")\->abs("http://host/a/b") \& ==> "http://host/foo" .Ve .SH "BUGS" .IX Header "BUGS" Using regexp variables like \f(CW$1\fR directly as arguments to the \s-1URI\s0 methods does not work too well with current perl implementations. I would argue that this is actually a bug in perl. The workaround is to quote them. Example: .PP .Vb 2 \& /(...)/ || die; \& $u\->query("$1"); .Ve .SH "PARSING URIs WITH REGEXP" .IX Header "PARSING URIs WITH REGEXP" As an alternative to this module, the following (official) regular expression can be used to decode a \s-1URI:\s0 .PP .Vb 2 \& my($scheme, $authority, $path, $query, $fragment) = \& $uri =~ m|(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:\e?([^#]*))?(?:#(.*))?|; .Ve .PP The \f(CW\*(C`URI::Split\*(C'\fR module provides the function \fIuri_split()\fR as a readable alternative. .SH "SEE ALSO" .IX Header "SEE ALSO" URI::file, URI::WithBase, URI::QueryParam, URI::Escape, URI::Split, URI::Heuristic .PP \&\s-1RFC\s0 2396: \*(L"Uniform Resource Identifiers (\s-1URI\s0): Generic Syntax\*(R", Berners-Lee, Fielding, Masinter, August 1998. .PP http://www.iana.org/assignments/uri\-schemes .PP http://www.iana.org/assignments/urn\-namespaces .PP http://www.w3.org/Addressing/ .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 1995\-2003 Gisle Aas. .PP Copyright 1995 Martijn Koster. .PP This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. .SH "AUTHORS / ACKNOWLEDGMENTS" .IX Header "AUTHORS / ACKNOWLEDGMENTS" This module is based on the \f(CW\*(C`URI::URL\*(C'\fR module, which in turn was (distantly) based on the \f(CW\*(C`wwwurl.pl\*(C'\fR code in the libwww-perl for perl4 developed by Roy Fielding, as part of the Arcadia project at the University of California, Irvine, with contributions from Brooks Cutter. .PP \&\f(CW\*(C`URI::URL\*(C'\fR was developed by Gisle Aas, Tim Bunce, Roy Fielding and Martijn Koster with input from other people on the libwww-perl mailing list. .PP \&\f(CW\*(C`URI\*(C'\fR and related subclasses was developed by Gisle Aas.