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?

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.

To install mod_perl2, copy and paste the appropriate command in to your terminal.

cpanm

cpanm mod_perl2

CPAN shell

perl -MCPAN -e shell
install mod_perl2

For more information on module installation, please visit the detailed CPAN module installation guide.

	Global
`s`	Focus search bar
`?`	Bring up this help dialog

	GitHub
`g` `p`	Go to pull requests
`g` `i`	go to github issues (only if github is preferred repository)

	POD
`g` `a`	Go to author
`g` `c`	Go to changes
`g` `i`	Go to issues
`g` `d`	Go to dist
`g` `r`	Go to repository/SCM
`g` `s`	Go to source
`g` `b`	Go to file browse

	Search terms
module: (e.g. module:Plugin)
distribution: (e.g. distribution:Dancer auth)
author: (e.g. author:SONGMU Redis)
version: (e.g. version:1.00)

NAME

Synopsis

Description

API

DESTROY

internal_redirect

internal_redirect_handler

lookup_file

lookup_method_uri

lookup_uri

run