handling filedrop.js upload gives a 400

I'm switching from dropzone.js to filedrop.js.  I'm using the same endpoint as I did for dropzone.js, but I get a 400 error dropping the example code into my html.  I'm not quite sure where to go from here to debug it.  I'm not sure if it's a simple different in how filedrop.js handles encoding or domains compared to dropzone.js.  Any tips for debugging this?  

Here's the request being set out when uploading a png.  

1. 
   Accept:
   */*
2. Accept-Encoding:
   gzip, deflate
3. Accept-Language:
   en-US,en;q=0.8
4. Connection:
   keep-alive
5. Content-Length:
   1132236
6. Content-Type:
   application/octet-stream
7. Cookie:
   session=eyJ1c2VybmFtZSI6InN0cmF0dG9uYnJhemlsQGdtYWlsLmNvbSJ9.CLpJRw.NsmzkIGOzH-nFFvKTiBWtIwvlFw
8. Host:
   localhost:5000
9. Origin:
   http://localhost:5000
10. Referer:
    http://localhost:5000/admin
11. User-Agent:
    Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36
12. X-File-Date:
    Tue, 09 Sep 2014 14:29:26 GMT
13. X-File-Name:
    Screenshot%20from%202014-09-09%2007%3A29%3A26%20-%201.png
14. X-File-Size:
    1132236
15. X-File-Type:
    image/png
16. X-Requested-With:
    FileDrop-XHR-FileAPI
1. Request Payload
1. ‰PNG
2. 
   
3. And here's the code I had previously in the handler.  
   

@app.route('/header', methods=['GET', 'POST'])

@requires_auth

def header(forcedName=None):

    print('header')

    if request.method == 'POST':

        file = request.files['file']

        print(file)

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