white screen of death at /wp-admin/post.php?action=edit&post=2

there appears to be a “white screen of death” caused by the plugin when running on the dev_appserver.

At line 302 on modules/uploads.php the plugin calls the following, which does not return:

$sign_result = AppIdentityService::signForApp( AUTH_KEY . get_current_user_id() );

the lack of return causes /wp-admin/post.php?action=edit&post=2 to die with no response to the browser. The dev_appserver logs the request as successfully completing with a 200 response code.

debug_print_backtrace() on the immediately preceeding line reveals the following chain of function calls:

#0  google\appengine\WordPress\Uploads\Uploads::get_wrapped_url(/wp-admin/async-upload.php) called at [/home/dllewellyn/web/fof/htdocs/wp-content/plugins/google-app-engine/modules/uploads.php:264]
#1  google\appengine\WordPress\Uploads\Uploads::plupload_settings(Array ([runtimes] => html5,silverlight,flash,html4,[file_data_name] => async-upload,[multiple_queues] => 1,[max_file_size] => 2097152b,[url] => /wp-admin/async-upload.php,[flash_swf_url] => http://robinhood.local:8080/wp-includes/js/plupload/plupload.flash.swf,[silverlight_xap_url] => http://robinhood.local:8080/wp-includes/js/plupload/plupload.silverlight.xap,[filters] => Array ([0] => Array ([title] => Allowed Files,[extensions] => *)),[multipart] => 1,[urlstream_upload] => 1))
#2  call_user_func_array(google\appengine\WordPress\Uploads\Uploads::plupload_settings, Array ([0] => Array ([runtimes] => html5,silverlight,flash,html4,[file_data_name] => async-upload,[multiple_queues] => 1,[max_file_size] => 2097152b,[url] => /wp-admin/async-upload.php,[flash_swf_url] => http://robinhood.local:8080/wp-includes/js/plupload/plupload.flash.swf,[silverlight_xap_url] => http://robinhood.local:8080/wp-includes/js/plupload/plupload.silverlight.xap,[filters] => Array ([0] => Array ([title] => Allowed Files,[extensions] => *)),[multipart] => 1,[urlstream_upload] => 1))) called at [/home/dllewellyn/web/fof/htdocs/wp-includes/plugin.php:173]
#3  apply_filters(plupload_default_settings, Array ([runtimes] => html5,silverlight,flash,html4,[file_data_name] => async-upload,[multiple_queues] => 1,[max_file_size] => 2097152b,[url] => /wp-admin/async-upload.php,[flash_swf_url] => http://robinhood.local:8080/wp-includes/js/plupload/plupload.flash.swf,[silverlight_xap_url] => http://robinhood.local:8080/wp-includes/js/plupload/plupload.silverlight.xap,[filters] => Array ([0] => Array ([title] => Allowed Files,[extensions] => *)),[multipart] => 1,[urlstream_upload] => 1)) called at [/home/dllewellyn/web/fof/htdocs/wp-includes/media.php:1283]
#4  wp_plupload_default_settings() called at [/home/dllewellyn/web/fof/htdocs/wp-includes/media.php:1554]
#5  wp_enqueue_media(Array ([post] => 2)) called at [/home/dllewellyn/web/fof/htdocs/wp-admin/edit-form-advanced.php:29]
#6  include(/home/dllewellyn/web/flirtorflush/htdocs/wp-admin/edit-form-advanced.php) called at [/home/dllewellyn/web/fof/htdocs/wp-admin/post.php:185]
#7  require(/home/dllewellyn/web/fof/htdocs/wp-admin/post.php) called at [/home/dllewellyn/google_appengine/google/appengine/tools/devappserver2/php/setup.php:51]

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http://wordpress.org/extend/plugins/google-app-engine/