I'm doing some cross domain chunked uploads with CORS, on a really super slow connection (low signal HSPA or 3G) i find that the client is re-requesting the OPTIONS for almost every POST (on a 1-2 minute interval). I have already set a 10 minute preflight approval set (add_header Access-Control-Max-Age 600;) and i have confirmed with inspector that the mobile client is receiving this header. Is there some other header that i need to add to make the client not repeatedly make OPTIONS requests?
I have read the other threads but none of them provide any solution to my issue:
Is Chrome ignoring Control-Cache: max-age?
CORS Access-Control-Max-Age is ignored
All of them say that the browser should accept a 10 minute pre flight cache if i set that header, but this is not what i am experiencing at all. And those repeated requests for OPTIONS is only making my slow users experience worse by slowing down the upload speed even further.
I have cross posted this issue to the google chrome issue tracker here: https://code.google.com/p/chromium/issues/detail?id=131368#c10 with some screenshots from the inspector.