Problem uploading file name - test"try.txt (with double quotes inside file name) under firefox browser.
It pass to backend file content as a file name.

{"note": [""], "upfile": ["erthtyjt\nrthy\ntrh\nrt\nh\nrt\nh\nrt\nh\nrth\nr\nth\nr\nth\n\nt\n\n"]}

here is debug from nginx.
http://pastebin.com/P6nkNNj3