Provided by: libapache2-mod-perl2_2.0.8+httpd24-r1449661-6ubuntu2.1_amd64 
NAME
Apache2::SubRequest - Perl API for Apache subrequests
Synopsis
use Apache2::SubRequest ();
# run internal redirects at once
$r->internal_redirect($new_uri);
$r->internal_redirect_handler($new_uri);
# create internal redirect objects
$subr = $r->lookup_uri("/foo");
$subr = $r->lookup_method_uri("GET", "/tmp/bar")
$subr = $r->lookup_file("/tmp/bar");
# optionally manipulate the output through main request filters
$subr = $r->lookup_uri("/foo", $r->output_filters);
# now run them
my $rc = $subr->run;
Description
"Apache2::SubRequest" contains API for creating and running of Apache sub-requests.
"Apache2::SubRequest" is a sub-class of "Apache2::RequestRec object".
API
"Apache2::SubRequest" provides the following functions and/or methods:
"DESTROY"
Free the memory associated with a sub request:
undef $subr; # but normally don't do that
obj: $subr ( "Apache2::SubRequest object" )
The sub request to finish
ret: no return value
since: 2.0.00
"DESTROY" is called automatically when $subr goes out of scope.
If you want to free the memory earlier than that (for example if you run several
subrequests), you can "undef" the object as:
undef $subr;
but never call "DESTROY" explicitly, since it'll result in "ap_destroy_sub_req" being
called more than once, resulting in multiple brain injuries and certain hair loss.
"internal_redirect"
Redirect the current request to some other uri internally
$r->internal_redirect($new_uri);
obj: $r ( "Apache2::RequestRec object" )
The current request
arg1: $new_uri ( string )
The URI to replace the current request with
ret: no return value
since: 2.0.00
In case that you want some other request to be served as the top-level request instead of
what the client requested directly, call this method from a handler, and then immediately
return "Apache2::Const::OK". The client will be unaware the a different request was served
to her behind the scenes.
"internal_redirect_handler"
Identical to "internal_redirect", plus automatically sets "$r->content_type" is of the
sub-request to be the same as of the main request, if "$r->handler" is true.
$r->internal_redirect_handler($new_uri);
obj: $r ( "Apache2::RequestRec object" )
The current request
arg1: $new_uri ( string )
The URI to replace the current request with.
ret: no return value
since: 2.0.00
This function is designed for things like actions or CGI scripts, when using "AddHandler",
and you want to preserve the content type across an internal redirect.
"lookup_file"
Create a subrequest for the given file. This sub request can be inspected to find
information about the requested file
$ret = $r->lookup_file($new_file);
$ret = $r->lookup_file($new_file, $next_filter);
obj: $r ( "Apache2::RequestRec object" )
The current request
arg1: $new_file ( string )
The file to lookup
opt arg2: $next_filter ( "Apache2::Filter" )
See "$r->lookup_uri" for details.
ret: $ret ( "Apache2::SubRequest object" )
The sub request record.
since: 2.0.00
See "$r->lookup_uri" for further discussion.
"lookup_method_uri"
Create a sub request for the given URI using a specific method. This sub request can be
inspected to find information about the requested URI
$ret = $r->lookup_method_uri($method, $new_uri);
$ret = $r->lookup_method_uri($method, $new_uri, $next_filter);
obj: $r ( "Apache2::RequestRec object" )
The current request
arg1: $method ( string )
The method to use in the new sub request (e.g. "GET")
arg2: $new_uri ( string )
The URI to lookup
opt arg3: $next_filter ( "Apache2::Filter object" )
See "$r->lookup_uri" for details.
ret: $ret ( "Apache2::SubRequest object" )
The sub request record.
since: 2.0.00
See "$r->lookup_uri" for further discussion.
"lookup_uri"
Create a sub request from the given URI. This sub request can be inspected to find
information about the requested URI.
$ret = $r->lookup_uri($new_uri);
$ret = $r->lookup_uri($new_uri, $next_filter);
obj: $r ( "Apache2::RequestRec object" )
The current request
arg1: $new_uri ( string )
The URI to lookup
opt arg2: $next_filter ( "Apache2::Filter object" )
The first filter the subrequest should pass the data through. If not specified it
defaults to the first connection output filter for the main request
"$r->proto_output_filters". So if the subrequest sends any output it will be filtered
only once. If for example you desire to apply the main request's output filters to the
sub-request output as well pass "$r->output_filters" as an argument.
ret: $ret ( "Apache2::SubRequest object" )
The sub request record
since: 2.0.00
Here is an example of a simple subrequest which serves uri /new_uri:
sub handler {
my $r = shift;
my $subr = $r->lookup_uri("/new_uri");
$subr->run;
return Apache2::Const::OK;
}
If let's say you have three request output filters registered to run for the main request:
PerlOutputFilterHandler MyApache2::SubReqExample::filterA
PerlOutputFilterHandler MyApache2::SubReqExample::filterB
PerlOutputFilterHandler MyApache2::SubReqExample::filterC
and you wish to run them all, the code needs to become:
my $subr = $r->lookup_uri("/new_uri", $r->output_filters);
and if you wish to run them all, but the first one ("filterA"), the code needs to be
adjusted to be:
my $subr = $r->lookup_uri("/new_uri", $r->output_filters->next);
"run"
Run a sub-request
$rc = $subr->run();
obj: $subr ( "Apache2::RequestRec object" )
The sub-request (e.g. returned by "lookup_uri")
ret: $rc ( integer )
The return code of the handler ("Apache2::Const::OK", "Apache2::Const::DECLINED",
etc.)
since: 2.0.00
Unsupported API
"Apache2::SubRequest" also provides auto-generated Perl interface for a few other methods
which aren't tested at the moment and therefore their API is a subject to change. These
methods will be finalized later as a need arises. If you want to rely on any of the
following methods please contact the the mod_perl development mailing list so we can help
each other take the steps necessary to shift the method to an officially supported API.
"internal_fast_redirect"
META: Autogenerated - needs to be reviewed/completed
Redirect the current request to a sub_req, merging the pools
$r->internal_fast_redirect($sub_req);
obj: $r ( "Apache2::RequestRec object" )
The current request
arg1: $sub_req ( string )
A subrequest created from this request
ret: no return value
since: 2.0.00
META: httpd-2.0/modules/http/http_request.c declares this function as:
/* XXX: Is this function is so bogus and fragile that we deep-6 it? */
do we really want to expose it to mod_perl users?
"lookup_dirent"
META: Autogenerated - needs to be reviewed/completed
Create a sub request for the given apr_dir_read result. This sub request can be inspected
to find information about the requested file
$lr = $r->lookup_dirent($finfo);
$lr = $r->lookup_dirent($finfo, $subtype);
$lr = $r->lookup_dirent($finfo, $subtype, $next_filter);
obj: $r ( "Apache2::RequestRec object" )
The current request
arg1: $finfo ( "APR::Finfo object" )
The apr_dir_read result to lookup
arg2: $subtype ( integer )
What type of subrequest to perform, one of;
Apache2::SUBREQ_NO_ARGS ignore r->args and r->path_info
Apache2::SUBREQ_MERGE_ARGS merge r->args and r->path_info
arg3: $next_filter ( integer )
The first filter the sub_request should use. If this is NULL, it defaults to the
first filter for the main request
ret: $lr ( "Apache2::RequestRec object" )
The new request record
since: 2.0.00
META: where do we take the apr_dir_read result from?
See Also
mod_perl 2.0 documentation.
Copyright
mod_perl 2.0 and its core modules are copyrighted under The Apache Software License,
Version 2.0.
Authors
The mod_perl development team and numerous contributors.
perl v5.18.2 libapache2-mod-perl2-2.0.8+httpd24-r1449661::docs::api::Apache2::SubRequest(3pm)