First, you must have a handler source module. Your my_test.c would look something like this: #include <httpd.h> #include <apr_file_info.h> static int MyTest (request_rec *r); static void RegisterHooks(apr_pool_t *p); module AP_MODULE_DECLARE_DATA my_test =
{ STANDARD20_MODULE_STUFF, NULL, /* Create per-directory config */ NULL, /* Merge per-directory config */ NULL, /* Create per-server config */ NULL, /* Merge per-server config */ NULL, /* Command apr_table_t */ RegisterHooks /* Register our hooks */ }; static void RegisterHooks ( apr_pool_t *p ) { ap_hook_handler(MyTest, NULL, NULL, APR_HOOK_MIDDLE); } static int MyTest (request_rec *r) { int APRStatus = OK; switch (r->finfo.filetype) { case APR_NOFILE: return(HTTP_NOT_FOUND); case APR_REG: break; default: return(DECLINED); } /* Your module's stuff */ return(APRStatus); } Next, compile you're my_test.c with apxs, an Apache command that will ensure that
the module is compiled correctly. This will produce a shared library that Apache can load. Use commands like this: apxs -c -o my_test.so my_test.c mv .libs/my_test.so my_test.so Next, change the Apache configuration to have the following two lines: LoadModule my_test my_test.so SetHandler my_test
Finally, restart Apache. The really hard stuff will be in the place of "Your module's stuff". There you'll need to create a bucket brigade to receive the contents
of the request, and a new bucket brigade to send the modified
response back. This example assumes that you're writing a request handler, which will receive a request and send a response. However, you're probably interested in writing a filter which will be used to modify the request
which will ultimately be feed to a request handler further on in the request brigade. I don't have a lot of experience with filters, so I'll stop here.
At the very least, you'll need to change
APR_HOOK_MIDDLE to something else. Hope this helps,
Tiago Semprebom