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편집 파일: LWP::Protocol.3pm

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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" LWP::Protocol \- Base class for LWP protocols .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 2 \& package LWP::Protocol::foo; \& use parent qw(LWP::Protocol); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" This class is used as the base class for all protocol implementations supported by the \s-1LWP\s0 library. .PP When creating an instance of this class using \&\f(CW\*(C`LWP::Protocol::create($url)\*(C'\fR, and you get an initialized subclass appropriate for that access method. In other words, the \&\*(L"create\*(R" in LWP::Protocol function calls the constructor for one of its subclasses. .PP All derived \f(CW\*(C`LWP::Protocol\*(C'\fR classes need to override the \f(CW\*(C`request()\*(C'\fR method which is used to service a request. The overridden method can make use of the \f(CW\*(C`collect()\*(C'\fR method to collect together chunks of data as it is received. .SH "METHODS" .IX Header "METHODS" The following methods and functions are provided: .SS "new" .IX Subsection "new" .Vb 1 \& my $prot = LWP::Protocol\->new(); .Ve .PP The LWP::Protocol constructor is inherited by subclasses. As this is a virtual base class this method should \fBnot\fR be called directly. .SS "create" .IX Subsection "create" .Vb 1 \& my $prot = LWP::Protocol::create($scheme) .Ve .PP Create an object of the class implementing the protocol to handle the given scheme. This is a function, not a method. It is more an object factory than a constructor. This is the function user agents should use to access protocols. .SS "implementor" .IX Subsection "implementor" .Vb 1 \& my $class = LWP::Protocol::implementor($scheme, [$class]) .Ve .PP Get and/or set implementor class for a scheme. Returns \f(CW\*(Aq\*(Aq\fR if the specified scheme is not supported. .SS "request" .IX Subsection "request" .Vb 4 \& $response = $protocol\->request($request, $proxy, undef); \& $response = $protocol\->request($request, $proxy, \*(Aq/tmp/sss\*(Aq); \& $response = $protocol\->request($request, $proxy, \e&callback, 1024); \& $response = $protocol\->request($request, $proxy, $fh); .Ve .PP Dispatches a request over the protocol, and returns a response object. This method needs to be overridden in subclasses. Refer to LWP::UserAgent for description of the arguments. .SS "collect" .IX Subsection "collect" .Vb 3 \& my $res = $prot\->collect(undef, $response, $collector); # stored in $response \& my $res = $prot\->collect($filename, $response, $collector); \& my $res = $prot\->collect(sub { ... }, $response, $collector); .Ve .PP Collect the content of a request, and process it appropriately into a scalar, file, or by calling a callback. If the first parameter is undefined, then the content is stored within the \f(CW$response\fR. If it's a simple scalar, then it's interpreted as a file name and the content is written to this file. If it's a code reference, then content is passed to this routine. If it is a filehandle, or similar, such as a File::Temp object, content will be written to it. .PP The collector is a routine that will be called and which is responsible for returning pieces (as ref to scalar) of the content to process. The \f(CW$collector\fR signals \f(CW\*(C`EOF\*(C'\fR by returning a reference to an empty string. .PP The return value is the HTTP::Response object reference. .PP \&\fBNote:\fR We will only use the callback or file argument if \&\f(CW\*(C`$response\->is_success()\*(C'\fR. This avoids sending content data for redirects and authentication responses to the callback which would be confusing. .SS "collect_once" .IX Subsection "collect_once" .Vb 1 \& $prot\->collect_once($arg, $response, $content) .Ve .PP Can be called when the whole response content is available as content. This will invoke \*(L"collect\*(R" in LWP::Protocol with a collector callback that returns a reference to \f(CW$content\fR the first time and an empty string the next. .SH "SEE ALSO" .IX Header "SEE ALSO" Inspect the \fILWP/Protocol/file.pm\fR and \fILWP/Protocol/http.pm\fR files for examples of usage. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 1995\-2001 Gisle Aas. .PP This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.