how to use mod_proxy's "proxy-server" handler in your custom Apache module

reverse_proxy_module.c

#include "httpd.h"
#include "http_config.h"
#include "http_protocol.h"
#include "ap_config.h"
#include "apr_strings.h"
#include "http_request.h"

static int reverse_proxy_handler(request_rec *r)
{
    r->filename = apr_pstrcat(r->pool, "proxy:http://example.com/", r->unparsed_uri, NULL);
    r->proxyreq = PROXYREQ_REVERSE;
    r->handler  = "proxy-server";
    return OK;
}

static void reverse_proxy_register_hooks(apr_pool_t *p)
{
    ap_hook_fixups(reverse_proxy_handler, NULL, NULL, APR_HOOK_FIRST);
}

/* Dispatch list for API hooks */
module AP_MODULE_DECLARE_DATA reverse_proxy_module = {
    STANDARD20_MODULE_STUFF, 
    NULL,                  /* create per-dir    config structures */
    NULL,                  /* merge  per-dir    config structures */
    NULL,                  /* create per-server config structures */
    NULL,                  /* merge  per-server config structures */
    NULL,                  /* table of config file commands       */
    reverse_proxy_register_hooks  /* register hooks                      */
};

a bit buggy ,,,