1HTTP::Proxy::BodyFilterU:s:ehrtmClopnatrrsiebru(t3e)d PeHrTlTPD:o:cPurmoexnyt:a:tBioodnyFilter::htmlparser(3)
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NAME

6       HTTP::Proxy::BodyFilter::htmlparser - Filter using HTML::Parser
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SYNOPSIS

9           use HTTP::Proxy::BodyFilter::htmlparser;
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11           # $parser is a HTML::Parser object
12           $proxy->push_filter(
13               mime     => 'text/html',
14               response => HTTP::Proxy::BodyFilter::htmlparser->new( $parser );
15           );
16

DESCRIPTION

18       The HTTP::Proxy::BodyFilter::htmlparser lets you create a filter based
19       on the HTML::Parser object of your choice.
20
21       This filter takes a HTML::Parser object as an argument to its
22       constructor.  The filter is either read-only or read-write. A read-only
23       filter will not allow you to change the data on the fly. If you request
24       a read-write filter, you'll have to rewrite the response-body
25       completely.
26
27       With a read-write filter, you must recreate the whole body data. This
28       is mainly due to the fact that the HTML::Parser has its own buffering
29       system, and that there is no easy way to correlate the data that
30       triggered the HTML::Parser event and its original position in the chunk
31       sent by the origin server. See below for details.
32
33       Note that a simple filter that modify the HTML text (not the tags) can
34       be created more easily with HTTP::Proxy::BodyFilter::htmltext.
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36   Creating a HTML::Parser that rewrites pages
37       A read-write filter is declared by passing "rw => 1" to the
38       constructor:
39
40            HTTP::Proxy::BodyFilter::htmlparser->new( $parser, rw => 1 );
41
42       To be able to modify the body of a message, a filter created with
43       HTTP::Proxy::BodyFilter::htmlparser must rewrite it completely. The
44       HTML::Parser object can update a special attribute named "output".  To
45       do so, the HTML::Parser handler will have to request the "self"
46       attribute (that is to say, require access to the parser itself) and
47       update its "output" key.
48
49       The following attributes are added to the HTML::Parser object by this
50       filter:
51
52       output
53           A string that will hold the data sent back by the proxy.
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55           This string will be used as a replacement for the body data only if
56           the filter is read-write, that is to say, if it was initialised
57           with "rw => 1".
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59           Data should always be appended to "$parser->{output}".
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61       message
62           A reference to the HTTP::Message that triggered the filter.
63
64       protocol
65           A reference to the HTTP::Protocol object.
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METHODS

68       This filter defines three methods, called automatically:
69
70       filter()
71           The "filter()" method handles all the interactions with the
72           HTML::Parser object.
73
74       init()
75           Initialise the filter with the HTML::Parser object passed to the
76           constructor.
77
78       will_modify()
79           This method returns a boolean value that indicates to the system if
80           it will modify the data passing through. The value is actually the
81           value of the "rw" parameter passed to the constructor.
82

SEE ALSO

84       HTTP::Proxy, HTTP::Proxy::Bodyfilter,
85       HTTP::Proxy::BodyFilter::htmltext.
86

AUTHOR

88       Philippe "BooK" Bruhat, <book@cpan.org>.
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91       Copyright 2003-2015, Philippe Bruhat.
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LICENSE

94       This module is free software; you can redistribute it or modify it
95       under the same terms as Perl itself.
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99perl v5.34.0                      2022-01H-T2T1P::Proxy::BodyFilter::htmlparser(3)
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