Re: Intercepting HTTP 301/302 redirects

[Joe Lewis]

Congrats!  Welcome to the world of filters!


On 03/01/2012 09:37 AM, Swaminathan Bhaskar wrote:

Ahh - Finally, I was able to get it working. Thanks for the pointer.

Here is the code snippet:

#include<stdio.h>
#include<httpd.h>
#include<http_protocol.h>
#include<http_config.h>
#include<http_log.h>
#include<util_filter.h>

#define MY_FILTER_NAME "myfilter"

static void insert_myfilter(request_rec *req)
{
     ap_add_output_filter(MY_FILTER_NAME, NULL, req, req->connection);

     ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, req->server, "mod_myfilter:
inserted myfilter");
}

static int my_output_filter(ap_filter_t *f, apr_bucket_brigade *bb)
{
     if (f->r->status_line != NULL) {
         ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, f->r->server,
"mod_myfilter: status = %d, status-line = %s", f->r->status,
f->r->status_line);
     }
     else {
         ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, f->r->server,
"mod_myfilter: status = %d", f->r->status);
     }

     ap_pass_brigade(f->next, bb);

     return APR_SUCCESS;
}

static void my_filter_hooks(apr_pool_t *pool)
{
     ap_register_output_filter(MY_FILTER_NAME, my_output_filter, NULL,
AP_FTYPE_RESOURCE);

     ap_hook_insert_filter(insert_myfilter, NULL, NULL, APR_HOOK_LAST);

     ap_hook_insert_error_filter(insert_myfilter, NULL, NULL, APR_HOOK_LAST);

     fprintf(stderr, "mod_myfilter: registered my_output_filter\n");
}

module AP_MODULE_DECLARE_DATA myfilter_module = {
     STANDARD20_MODULE_STUFF,
     NULL,
     NULL,
     NULL,
     NULL,
     NULL,
     my_filter_hooks
};

Rgds
Bhaskar