Flask can't read multipart form boundaries from custom HTTP clients

[multimeric]

I consistently get the error "TypeError: cannot concatenate 'str' and 'NoneType' objects" whenever I send a multipart form from anywhere that's not an HTML

.

For example AndroidQuery's, Apache HttpClient, and the Chrome Postman plugin all give this error.

Trace:
File "C:\Python27\lib\site-packages\werkzeug\formparser.py", line 382, in parse_lines
next_part = b'--' + boundary

[untitaker]

Can you provide the headers of your request please?

[multimeric]

As it turns out, I was setting the Content-Type manually in each of these cases, which meant the form boundaries weren't correct. You can safely ignore this.

[untitaker]

Ok cool.