Problem with ap_internal_redirect_handler

Martin Townsend Wed, 18 Aug 2010 05:25:34 -0700

Hi,

I'm currently trying to add the ability to redirect requests for theinitial html page to a captcha page when there is no session or no validsession. Currently I'm doing this in the fixups hook:


mod_smu_fixups(request_rec* r) {
    const char * content_type_str_p;
    const char * content_len_str_p;
    /* Get the modules config vector. */
    MOD_SMU_SERVER_CFG_T * const smu_svr_cfg_p = ap_get_module_config(
            r->server->module_config,
&smu_module);

    if(DEBUG_ENABLED & DEBUG_SMU) {
        ap_log_rerror(APLOG_MARK, APLOG_NOTICE, 0, r,
                      "SMU Module Fixups %s (%s)",
                      r->method, r->filename);

        ap_log_rerror(APLOG_MARK, APLOG_NOTICE, 0, r,

"SMU Module Fixups init-req(%d) handler(%s)content-type(%s)",

                      ap_is_initial_req(r), r->handler, r->content_type);
    }

    /*

* If we are being requested for the captcha image then send thisrequest* to the smu-captcha content generator which will generate it onthe fly.

     */
    if(smu_captcha_is_image_request(r)) {
        ap_log_rerror(APLOG_MARK, APLOG_NOTICE, 0, r,
                      "SMU Fixup CAPTCHA Image (%s)", r->filename);
        r->handler = "application/smu-captcha";
        return OK;
    }

/* If this is the initial request (ie not a sub request) clear theerror

     * and command list */
    if(ap_is_initial_req(r)) {
        /* First up ensure that the error and command list are empty */
        mod_smu_list_empty(smu_svr_cfg_p->command_list_p);

        /* Empty error list */
        mod_smu_list_empty(smu_svr_cfg_p->error_list_p);

        /* Check to see if a captcha page is needed. */
        if(captcha_display_needed(r)
&& apr_strnatcasecmp(r->content_type, "text/html") == 0
        ) {
            //r->handler = "application/smu_captcha";
            //ap_internal_redirect("/captcha.shtml", r);
            ap_log_rerror(APLOG_MARK, APLOG_NOTICE, 0, r,
                      "SMU Fixup CAPTCHA needed (%s)", r->filename);
            ap_internal_redirect_handler("/captcha.shtml", r);
            return OK;
        }
    }

....
}

So if we have an initial request that is HTML then redirect tocaptcha.shtml which contains SSI for header, footer etc. There willalso be a request for a captcha image using a fixed filename. The fixupwill detect this and send the request to a custom handler that willauto-generate the captcha image. The problem I have is that I'm gettingsub-requests and requests for the captcha image twice, see log below. Iassume that the original request for index.shtml and the request forcaptcha.shtml are being processed. Using firebug I see that the captchaimage that is displayed in the debug output isn't the one that getsdisplayed in the HTML so I can assume that the image is being senttwice. I notice that the browser goes into a waiting state until thetimeout expires. Does anybody know what I'm doing wrong? I've triedreturning DECLINED or DONE after the ap_internal_redirect_handler callbut still get the problem. Any help appreciated.


Best Regards,
Martin.

[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU FixupCAPTCHA needed (/var/www/index.shtml), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups GET (/var/www/captcha.shtml), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups init-req(0) handler((null)) content-type(text/html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups GET (/var/www/include/SSI_PageHead.html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups init-req(0) handler((null)) content-type(text/html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups GET (/var/www/include/SSI_PageTop.html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups init-req(0) handler((null)) content-type(text/html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups GET (/var/www/include/SSI_Contents.html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups init-req(0) handler((null)) content-type(text/html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups GET (/var/www/include/SSI_PageFooter.html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups init-req(0) handler((null)) content-type(text/html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups GET (/var/www/include/SSI_PageHead.html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups init-req(0) handler((null)) content-type(text/html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups GET (/var/www/include/SSI_PageTop.html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups init-req(0) handler((null)) content-type(text/html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups GET (/var/www/include/SSI_Contents.html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups init-req(0) handler((null)) content-type(text/html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups GET (/var/www/include/SSI_PageFooter.html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups init-req(0) handler((null)) content-type(text/html), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups GET (/var/www/sscd.css), referer: http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups init-req(1) handler((null)) content-type(text/css), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups GET (/var/www/captcha_image.gif), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU ModuleFixups init-req(1) handler((null)) content-type(image/gif), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] SMU FixupCAPTCHA Image (/var/www/captcha_image.gif), referer:http://192.168.0.52/index.shtml[Wed Aug 18 12:39:41 2010] [notice] [client 192.168.1.70] smu-captcha/var/www/captcha_image.gif, referer: http://192.168.0.52/index.shtml[Wed Aug 18 12:39:44 2010] [notice] [client 192.168.1.70] SMU ModuleFixups GET (/var/www/captcha_image.gif)[Wed Aug 18 12:39:44 2010] [notice] [client 192.168.1.70] SMU ModuleFixups init-req(1) handler((null)) content-type(image/gif)[Wed Aug 18 12:39:44 2010] [notice] [client 192.168.1.70] SMU FixupCAPTCHA Image (/var/www/captcha_image.gif)[Wed Aug 18 12:39:44 2010] [notice] [client 192.168.1.70] smu-captcha/var/www/captcha_image.gif

Problem with ap_internal_redirect_handler

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