----- Original Message ----- From: "pascal barbedor" <[EMAIL PROTECTED]> To: "Douglas Younger" <[EMAIL PROTECTED]> Sent: Monday, May 06, 2002 11:31 PM Subject: Re: How do I determine end of request? (mod_perl 2.0)
> hi > > you could maybe set the ProxyIOBufferSize > or Proxyreceivebuffersize > in the front end server so that response from modperl server would not be > chunked but one shot > > also static ressources like gif in server B documents could be retrieved > from server A only with an alias not proxied to server B > > > pascal > > > ----- Original Message ----- > From: "Douglas Younger" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Monday, May 06, 2002 10:26 PM > Subject: How do I determine end of request? (mod_perl 2.0) > > > > Hello, > > I'm fairly new to using mod_perl. I've been able to find lots of > > resources dealing with mod_perl 1.x, but the documentation for 2.0 is > > rather sparse. > > > > I'm pretty sure what I need to do can only be handled by Apache 2.0 & thus > > I'm forced to use mod_perl 2.0... (well 1.99) > > > > I'm trying to proxy ServerB through ServerA... ok that's simple enough > with > > mod_proxy. However, links, embedded images, etc in the proxied document > end > > up broken if they are non-relative links (ie. start with a slash). > > > > Example: on ServerB is a document say: /sales/products.html > > in products.html it links to /images/logo.gif > > accessing /sales/products.html using ServerB everything is fine. But, if I > > want to proxy ServerB via ServerA... say > > ProxyPass /EXTERNAL http://ServerB > > > > If I goto http://ServerA/EXTERNAL/sales/products.html the embedded image > > /images/logo.gif is requested from ServerA. > > > > So to handle this I wanted to write a filer for ServerA to parse all pages > > served via Location /EXTERNAL and "fix" the links. > > > > I wrote a handler (see below) using HTML::Parser to extract the tags that > > would contain links and process them. > > > > It works great for the most part... however, it seems like instead of > > ServerA getting the entire output from ServerB, it gets it in > > chunks which get processed individually. This causes my handler to fail > > when a tag is split between 2 chunks. > > > > What I think needs to be done is to build up the document in a variable > > $html .= $buffer; and then call the $p->$parse($html) once the entire > > document has been received by ServerA (or maybe as simple of only calling > > $p->eof; at that point). > > > > Or is there a better way to do this? One problem I've found so far is I > > need to fix style sheets, but I can probably write a special handler for > > them once I get this problem fixed. > > > > Thanks! > > > > ###################################################### > > package RewriteLinks; > > > > use strict; > > > > use Apache::Filter; > > use Apache::RequestUtil; > > use APR::Table; > > use HTML::Parser; > > > > my %ReplaceAttrs = ( a => 'href', > > img => 'src', > > link => 'href', > > td => 'background', > > form => 'action' > > ); > > my $filter; > > > > sub handler { > > $filter = shift; > > > > ### Create parser object ### > > my $p = HTML::Parser->new( api_version => 3 ); > > $p->handler(start => \&do_tags, 'tagname, attr, text' ); > > $p->handler(default => \&default, 'text'); > > > > while ($filter->read(my $buffer, 32678)) { > > $p->parse($buffer); > > } > > > > $p->eof; # signal end of document > > > > 1; > > } > > > > sub do_tags { > > my ($tagname, $attr, $text) = @_; > > > > ## only need to modify tags with url-like attributes starting with a > slash > > if ($$attr{$ReplaceAttrs{$tagname}} =~ m|^/|) { > > my $TAG = "<" . uc($tagname); > > foreach my $key (keys %$attr) { > > $TAG .= ' ' . uc($key) . '="'; > > if ($key eq $ReplaceAttrs{$tagname}) { > > $TAG .= '/EXTERNAL'; > > } > > $TAG .= $$attr{$key} . '"'; > > } > > $TAG .= ">\n"; > > $filter->print($TAG); > > } else { > > $filter->print($text); > > } > > > > } > > > > sub default { > > my ($text) = @_; > > $filter->print($text); > > } > > > > 1; > > > > > > > > >
