php - CloudStorageTools::createUploadUrl redirecting to incorrect url on upload -

i have wordpress multi-site install running on gae, works great part.

i want users upload files via front-end custom file handler @ {customdomain.com}/app/client/{client_id}/upload_profile_image/ (i'm using rewrite rules)

this works on non-app-engine setup (apache/php) when using gcs uploader seem redirected main site domain @ url: {maindomain}/wp-signup.php?new=

this code based on code wp google-app-engine plugin:

    $url = site_url('/app/client/' . $client->id . '/upload_profile_image/');     require_once 'google/appengine/api/cloud_storage/cloudstoragetools.php';     $options = [          'gs_bucket_name' => get_option('appengine_uploads_bucket', ''),          'url_expiry_time_seconds' => 60 * 60 * 24, // 1 day maximum     ];     $wp_maxupsize = wp_max_upload_size();     // set max_bytes_per_blob option if max upload size positive int     if (is_int($wp_maxupsize) && $wp_maxupsize > 0) {        $options['max_bytes_per_blob'] = $wp_maxupsize;     }     // setup internal authentication     $sign_result = \google\appengine\api\app_identity\appidentityservice::signforapp(auth_key . get_current_user_id());     $url = add_query_arg('gae_auth_user', get_current_user_id(), $url);     $url = add_query_arg('gae_auth_key', $sign_result['key_name'], $url);     $url = add_query_arg('gae_auth_signature', urlencode(base64_encode($sign_result['signature'])), $url);       $url = \google\appengine\api\cloud_storage\cloudstoragetools::createuploadurl($url,$options); 

when submit file (via drag/drop using dropzone) see following requests:

accept:application/json accept-encoding:gzip, deflate accept-language:en-us,en;q=0.8,es;q=0.6 cache-control:no-cache connection:keep-alive content-length:49190 content-type:multipart/form-data; boundary=----webkitformboundarytvowwgs3diihzpnf cookie: {cookies} host:{customdomain} origin:http://{customdomain} pragma:no-cache referer:http://{customdomain}/app/client/27/view/ user-agent:mozilla/5.0 (windows nt 6.3; wow64) applewebkit/537.36 (khtml, gecko) chrome/41.0.2272.89 safari/537.36 x-requested-with:xmlhttprequest 

the reply this:

alternate-protocol:80:quic,p=0.5,80:quic,p=0.5 cache-control:no-cache, must-revalidate content-length:0 content-type:text/html date:tue, 17 mar 2015 03:07:53 gmt expires:fri, 01 jan 1990 00:00:00 gmt location:http://{maindomain}/wp-signup.php?new= pragma:no-cache server:uploadserver ("built on mar 6 2015 11:14:41 (1425669281)") x-appengine-estimated-cpm-us-dollars:$0.000009 x-appengine-resource-usage:ms=174 cpu_ms=22 

which fails upload , in console: xmlhttprequest cannot load http://{maindomain}/wp-signup.php?new=. no 'access-control-allow-origin' header present on requested resource. origin 'http://{customdomain}' therefore not allowed access. response had http status code 404.

here app.yaml:

application:  version: 1 runtime: php55 api_version: 1  default_expiration: "1h"  inbound_services:   - warmup  handlers: - url: /robots.txt   static_files: robots.txt   upload: robots.txt  - url: /favicon.ico   static_files: wordpress/favicon.ico   upload: wordpress/favicon.ico  - url: /(.*\.(htm|html|css|js))$   static_files: wordpress/\1   upload: wordpress/.*\.(htm|html|css|js)$   application_readable: true  - url: /wp-content/(.*\.(ico|jpg|png|gif|svg|ttf|eot|woff|swf))$   static_files: wordpress/wp-content/\1   upload: wordpress/wp-content/.*\.(ico|jpg|png|gif|svg|ttf|eot|woff|swf)$   application_readable: true  - url: /(.*\.(ico|jpg|png|gif))$   static_files: wordpress/\1   upload: wordpress/.*\.(ico|jpg|png|gif)$  - url: /wp-admin/(.+)   script: wordpress/wp-admin/\1  - url: /wp-admin/   script: wordpress/wp-admin/index.php  - url: /wp-login.php   script: wordpress/wp-login.php  - url: /wp-cron.php   script: wordpress/wp-cron.php  - url: /wp-multi-cron.php   script: wordpress/wp-multi-cron.php  - url: /xmlrpc.php   script: wordpress/xmlrpc.php  - url: /wp-(.+).php   script: wordpress/wp-\1.php  - url: /(.+)?/?   script: wordpress/index.php  - url: /wp-admin/network/   script: wordpress/wp-admin/network/index.php  - url: /wp-admin/network/(.+)   script: wordpress/wp-admin/network/\1  - url: /([_0-9a-za-z-]+/)?(wp-(content|admin|includes).*\.(htm.*$|html.*$|css.*$|js.*$|ico.*$|jpg.*$|png.*$|gif.*$|woff.*$|ttf.*$|eot.*$|svg.*$))   static_files: wordpress/\2   upload: wordpress/([_0-9a-za-z-]+/)?(wp-(content|admin|includes).*\.(htm.*$|html.*$|css.*$|js.*$|ico.*$|jpg.*$|png.*$|gif.*$|woff.*$|ttf.*$|eot.*$|svg.*$))   application_readable: true   pagespeed:   domains_to_rewrite:   url_blacklist:   enabled_rewriters:   - lefttrimurls   disabled_rewriters:   - combinecss   - combinejs   - movecsstohead  skip_files: - wordpress/wp-content/uploads/.* - ^(.*/)?.*/.svn/.*$ 

i'm @ loss on issue. regular uploads via wp backend work fine, has i'm doing wrong. appreciated.

i found solution problem, suspected doing wrong.

for brevity omitted if statements caused $url empty before being passed 'createuploadurl' why after upload being redirected default site.

this happens when code late night after long day.