Hey Guys

I wrote a simple Filter which calls a subrequest - and started by
doing this very simply along the SSI style lines...

Please note - that although I could do this on the fly rather than
buffer, the end result for my code requires capture of the content,
so just imagine that bit is correct :-)

sub filter {
... buffer content into $context->{buffer} ...

if ($f->seen_eos) {

my $buffer = $context->{buffer};

while ((my $i = index($buffer, "EXPAND")) >= 0) {
$f->print(substr($buffer, 0, $i));
$buffer = substr($buffer, $i + 6);

my $subr = $f->r->lookup_uri("/sub.html");

The above code always segfaults. Now the first thing that came to
mind was that a $subr->run() would output by printing to stderr which
of course would not work in the filter. Therefore I changed the code,
using the Apache2::TrapSubRequest module to...

my $subr = $f->r->lookup_uri('/sub.html');
my $data;
$subr->run_trapped(\$data, sub { return Apache2::Const::OK });

Same problem.

So I got thinking about how it works and thought maybe they just
don't work within a Filter.

When I try the same code within a normal handler it works fine...

BUT (and finally my question) mod_include runs as a filter and does
Sub Requests to get the content, so why don't they work in Perl ?

Am I missing something fundamental in Apache ? In mod_perl (e.g.
Apache::SubRequest is specifically for a provider)? or is there a
likely bug somewhere?

BTW. I tested this in both apache 2.0 and 2.2 using mod_perl2.0.2. I
have not added any traces or debug information yet in case there is
already an obvious answer.


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groupmodperl @
categoriesmodperl, perl
postedJun 19, '06 at 1:34a
activeAug 8, '06 at 4:12a



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