Trying to upload via drag-n-drop a text file containing the string "code" brings up the following error:
```
Upload Failure
test.txt
Exception: Request includes restricted parameter "code", but this controller ("PhabricatorFileDropUploadController") does not whitelist it. Refusing to serve this request because it might be part of a redirection attack.
```
Uploading via traditional upload form works.
There seems to be an explicit restriction on the string "code" in HTTP requests: https://secure.phabricator.com/diffusion/P/browse/master/src/applications/base/controller/PhabricatorController.php;504579850f0e9b3f9123908706719cbf8ff4c5d4$131
Since drag-n-drop POSTs the file's contents, the restriction is triggered.
Reproduce:
- create text file with string "code" in it
- try to upload it