http::message.3

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

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.\" ========================================================================
.\"
.IX Title "HTTP::Message 3"
.TH HTTP::Message 3 "2005-02-18" "perl v5.10.0" "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"
HTTP::Message \- HTTP style message (base class)
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& use base \*(AqHTTP::Message\*(Aq;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
An \f(CW\*(C`HTTP::Message\*(C'\fR object contains some headers and a content body.
The following methods are available:
.ie n .IP "$mess = HTTP::Message\->new" 4
.el .IP "\f(CW$mess\fR = HTTP::Message\->new" 4
.IX Item "$mess = HTTP::Message->new"
.PD 0
.ie n .IP "$mess\fR = HTTP::Message\->new( \f(CW$headers )" 4
.el .IP "\f(CW$mess\fR = HTTP::Message\->new( \f(CW$headers\fR )" 4
.IX Item "$mess = HTTP::Message->new( $headers )"
.ie n .IP "$mess\fR = HTTP::Message\->new( \f(CW$headers\fR, \f(CW$content )" 4
.el .IP "\f(CW$mess\fR = HTTP::Message\->new( \f(CW$headers\fR, \f(CW$content\fR )" 4
.IX Item "$mess = HTTP::Message->new( $headers, $content )"
.PD
This constructs a new message object.  Normally you would want
construct \f(CW\*(C`HTTP::Request\*(C'\fR or \f(CW\*(C`HTTP::Response\*(C'\fR objects instead.
.Sp
The optional \f(CW$header\fR argument should be a reference to an
\&\f(CW\*(C`HTTP::Headers\*(C'\fR object or a plain array reference of key/value pairs.
If an \f(CW\*(C`HTTP::Headers\*(C'\fR object is provided then a copy of it will be
embedded into the constructed message, i.e. it will not be owned and
can be modified afterwards without affecting the message.
.Sp
The optional \f(CW$content\fR argument should be a string of bytes.
.ie n .IP "$mess\fR = HTTP::Message\->parse( \f(CW$str )" 4
.el .IP "\f(CW$mess\fR = HTTP::Message\->parse( \f(CW$str\fR )" 4
.IX Item "$mess = HTTP::Message->parse( $str )"
This constructs a new message object by parsing the given string.
.ie n .IP "$mess\->headers" 4
.el .IP "\f(CW$mess\fR\->headers" 4
.IX Item "$mess->headers"
Returns the embedded \f(CW\*(C`HTTP::Headers\*(C'\fR object.
.ie n .IP "$mess\->headers_as_string" 4
.el .IP "\f(CW$mess\fR\->headers_as_string" 4
.IX Item "$mess->headers_as_string"
.PD 0
.ie n .IP "$mess\fR\->headers_as_string( \f(CW$eol )" 4
.el .IP "\f(CW$mess\fR\->headers_as_string( \f(CW$eol\fR )" 4
.IX Item "$mess->headers_as_string( $eol )"
.PD
Call the \fIas_string()\fR method for the headers in the
message.  This will be the same as
.Sp
.Vb 1
\&    $mess\->headers\->as_string
.Ve
.Sp
but it will make your program a whole character shorter :\-)
.ie n .IP "$mess\->content" 4
.el .IP "\f(CW$mess\fR\->content" 4
.IX Item "$mess->content"
.PD 0
.ie n .IP "$mess\fR\->content( \f(CW$content )" 4
.el .IP "\f(CW$mess\fR\->content( \f(CW$content\fR )" 4
.IX Item "$mess->content( $content )"
.PD
The \fIcontent()\fR method sets the raw content if an argument is given.  If no
argument is given the content is not touched.  In either case the
original raw content is returned.
.Sp
Note that the content should be a string of bytes.  Strings in perl
can contain characters outside the range of a byte.  The \f(CW\*(C`Encode\*(C'\fR
module can be used to turn such strings into a string of bytes.
.ie n .IP "$mess\fR\->add_content( \f(CW$data )" 4
.el .IP "\f(CW$mess\fR\->add_content( \f(CW$data\fR )" 4
.IX Item "$mess->add_content( $data )"
The \fIadd_content()\fR methods appends more data to the end of the current
content buffer.
.ie n .IP "$mess\->content_ref" 4
.el .IP "\f(CW$mess\fR\->content_ref" 4
.IX Item "$mess->content_ref"
.PD 0
.ie n .IP "$mess\->content_ref( \e$content )" 4
.el .IP "\f(CW$mess\fR\->content_ref( \e$content )" 4
.IX Item "$mess->content_ref( $content )"
.PD
The \fIcontent_ref()\fR method will return a reference to content buffer string.
It can be more efficient to access the content this way if the content
is huge, and it can even be used for direct manipulation of the content,
for instance:
.Sp
.Vb 1
\&  ${$res\->content_ref} =~ s/\ebfoo\eb/bar/g;
.Ve
.Sp
This example would modify the content buffer in-place.
.Sp
If an argument is passed it will setup the content to reference some
external source.  The \fIcontent()\fR and \fIadd_content()\fR methods
will automatically dereference scalar references passed this way.  For
other references \fIcontent()\fR will return the reference itself and
\&\fIadd_content()\fR will refuse to do anything.
.ie n .IP "$mess\fR\->decoded_content( \f(CW%options )" 4
.el .IP "\f(CW$mess\fR\->decoded_content( \f(CW%options\fR )" 4
.IX Item "$mess->decoded_content( %options )"
Returns the content with any \f(CW\*(C`Content\-Encoding\*(C'\fR undone and strings
mapped to perl's Unicode strings.  If the \f(CW\*(C`Content\-Encoding\*(C'\fR or
\&\f(CW\*(C`charset\*(C'\fR of the message is unknown this method will fail by
returning \f(CW\*(C`undef\*(C'\fR.
.Sp
The following options can be specified.
.RS 4
.ie n .IP """charset""" 4
.el .IP "\f(CWcharset\fR" 4
.IX Item "charset"
This override the charset parameter for text content.  The value
\&\f(CW\*(C`none\*(C'\fR can used to suppress decoding of the charset.
.ie n .IP """default_charset""" 4
.el .IP "\f(CWdefault_charset\fR" 4
.IX Item "default_charset"
This override the default charset of \*(L"\s-1ISO\-8859\-1\s0\*(R".
.ie n .IP """raise_error""" 4
.el .IP "\f(CWraise_error\fR" 4
.IX Item "raise_error"
If \s-1TRUE\s0 then raise an exception if not able to decode content.  Reason
might be that the specified \f(CW\*(C`Content\-Encoding\*(C'\fR or \f(CW\*(C`charset\*(C'\fR is not
supported.  If this option is \s-1FALSE\s0, then \fIdecode_content()\fR will return
\&\f(CW\*(C`undef\*(C'\fR on errors, but will still set $@.
.ie n .IP """ref""" 4
.el .IP "\f(CWref\fR" 4
.IX Item "ref"
If \s-1TRUE\s0 then a reference to decoded content is returned.  This might
be more efficient in cases where the decoded content is identical to
the raw content as no data copying is required in this case.
.RE
.RS 4
.RE
.ie n .IP "$mess\->parts" 4
.el .IP "\f(CW$mess\fR\->parts" 4
.IX Item "$mess->parts"
.PD 0
.ie n .IP "$mess\fR\->parts( \f(CW@parts )" 4
.el .IP "\f(CW$mess\fR\->parts( \f(CW@parts\fR )" 4
.IX Item "$mess->parts( @parts )"
.ie n .IP "$mess\->parts( \e@parts )" 4
.el .IP "\f(CW$mess\fR\->parts( \e@parts )" 4
.IX Item "$mess->parts( @parts )"
.PD
Messages can be composite, i.e. contain other messages.  The composite
messages have a content type of \f(CW\*(C`multipart/*\*(C'\fR or \f(CW\*(C`message/*\*(C'\fR.  This
method give access to the contained messages.
.Sp
The argumentless form will return a list of \f(CW\*(C`HTTP::Message\*(C'\fR objects.
If the content type of \f(CW$msg\fR is not \f(CW\*(C`multipart/*\*(C'\fR or \f(CW\*(C`message/*\*(C'\fR then
this will return the empty list.  In scalar context only the first
object is returned.  The returned message parts should be regarded as
are read only (future versions of this library might make it possible
to modify the parent by modifying the parts).
.Sp
If the content type of \f(CW$msg\fR is \f(CW\*(C`message/*\*(C'\fR then there will only be
one part returned.
.Sp
If the content type is \f(CW\*(C`message/http\*(C'\fR, then the return value will be
either an \f(CW\*(C`HTTP::Request\*(C'\fR or an \f(CW\*(C`HTTP::Response\*(C'\fR object.
.Sp
If an \f(CW@parts\fR argument is given, then the content of the message will
modified. The array reference form is provided so that an empty list
can be provided.  The \f(CW@parts\fR array should contain \f(CW\*(C`HTTP::Message\*(C'\fR
objects.  The \f(CW@parts\fR objects are owned by \f(CW$mess\fR after this call and
should not be modified or made part of other messages.
.Sp
When updating the message with this method and the old content type of
\&\f(CW$mess\fR is not \f(CW\*(C`multipart/*\*(C'\fR or \f(CW\*(C`message/*\*(C'\fR, then the content type is
set to \f(CW\*(C`multipart/mixed\*(C'\fR and all other content headers are cleared.
.Sp
This method will croak if the content type is \f(CW\*(C`message/*\*(C'\fR and more
than one part is provided.
.ie n .IP "$mess\fR\->add_part( \f(CW$part )" 4
.el .IP "\f(CW$mess\fR\->add_part( \f(CW$part\fR )" 4
.IX Item "$mess->add_part( $part )"
This will add a part to a message.  The \f(CW$part\fR argument should be
another \f(CW\*(C`HTTP::Message\*(C'\fR object.  If the previous content type of
\&\f(CW$mess\fR is not \f(CW\*(C`multipart/*\*(C'\fR then the old content (together with all
content headers) will be made part #1 and the content type made
\&\f(CW\*(C`multipart/mixed\*(C'\fR before the new part is added.  The \f(CW$part\fR object is
owned by \f(CW$mess\fR after this call and should not be modified or made part
of other messages.
.Sp
There is no return value.
.ie n .IP "$mess\->clear" 4
.el .IP "\f(CW$mess\fR\->clear" 4
.IX Item "$mess->clear"
Will clear the headers and set the content to the empty string.  There
is no return value
.ie n .IP "$mess\->protocol" 4
.el .IP "\f(CW$mess\fR\->protocol" 4
.IX Item "$mess->protocol"
.PD 0
.ie n .IP "$mess\fR\->protocol( \f(CW$proto )" 4
.el .IP "\f(CW$mess\fR\->protocol( \f(CW$proto\fR )" 4
.IX Item "$mess->protocol( $proto )"
.PD
Sets the \s-1HTTP\s0 protocol used for the message.  The \fIprotocol()\fR is a string
like \f(CW\*(C`HTTP/1.0\*(C'\fR or \f(CW\*(C`HTTP/1.1\*(C'\fR.
.ie n .IP "$mess\->clone" 4
.el .IP "\f(CW$mess\fR\->clone" 4
.IX Item "$mess->clone"
Returns a copy of the message object.
.ie n .IP "$mess\->as_string" 4
.el .IP "\f(CW$mess\fR\->as_string" 4
.IX Item "$mess->as_string"
.PD 0
.ie n .IP "$mess\fR\->as_string( \f(CW$eol )" 4
.el .IP "\f(CW$mess\fR\->as_string( \f(CW$eol\fR )" 4
.IX Item "$mess->as_string( $eol )"
.PD
Returns the message formatted as a single string.
.Sp
The optional \f(CW$eol\fR parameter specifies the line ending sequence to use.
The default is \*(L"\en\*(R".  If no \f(CW$eol\fR is given then as_string will ensure
that the returned string is newline terminated (even when the message
content is not).  No extra newline is appended if an explicit \f(CW$eol\fR is
passed.
.PP
All methods unknown to \f(CW\*(C`HTTP::Message\*(C'\fR itself are delegated to the
\&\f(CW\*(C`HTTP::Headers\*(C'\fR object that is part of every message.  This allows
convenient access to these methods.  Refer to HTTP::Headers for
details of these methods:
.PP
.Vb 7
\&    $mess\->header( $field => $val )
\&    $mess\->push_header( $field => $val )
\&    $mess\->init_header( $field => $val )
\&    $mess\->remove_header( $field )
\&    $mess\->remove_content_headers
\&    $mess\->header_field_names
\&    $mess\->scan( \e&doit )
\&
\&    $mess\->date
\&    $mess\->expires
\&    $mess\->if_modified_since
\&    $mess\->if_unmodified_since
\&    $mess\->last_modified
\&    $mess\->content_type
\&    $mess\->content_encoding
\&    $mess\->content_length
\&    $mess\->content_language
\&    $mess\->title
\&    $mess\->user_agent
\&    $mess\->server
\&    $mess\->from
\&    $mess\->referer
\&    $mess\->www_authenticate
\&    $mess\->authorization
\&    $mess\->proxy_authorization
\&    $mess\->authorization_basic
\&    $mess\->proxy_authorization_basic
.Ve
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 1995\-2004 Gisle Aas.
.PP
This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.