google app engine converting (redirecting) HTTP PO

Question

Https POST's on google app engine are getting redirected to app url with a GET and losing all arguments.

2011-11-28 22:21:06.026 / 302 218ms 0kb 71.167.39.92 - - [28/Nov/2011:19:21:06 -0800] "POST / HTTP/1.1" 302 0 "http://static.ak.facebook.com/platform/page_proxy.php?v=4" - "9.appname.appspot.com" ms=219 cpu_ms=0 api_cpu_ms=0 cpm_usd=0.000095

My handler is not called at this time, and app engine redirects above post to

2011-11-28 22:21:06.100 / 200 13ms 1kb Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0.2) Gecko/20100101 Firefox/6.0.2 71.167.39.92 - - [28/Nov/2011:19:21:06 -0800] "GET / HTTP/1.1" 200 1661 "http://static.ak.facebook.com/platform/page_proxy.php?v=4" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0.2) Gecko/20100101 Firefox/6.0.2" "9.appname.appspot.com" ms=14 cpu_ms=23 api_cpu_ms=0 cpm_usd=0.000873 instance=00c61b117c6840ba7ad8c376b950491ada80

This happens for every post. A HTTPs GET calls my handler directly.

Answer 1

I had a secure=always on my app.yaml - which caused the redirects to trigger every time on POSTs and resulted in GET's with full loss of post parameters (like signed_requests for FB apps for example). It is solved now.