In trying to write a PyPI service, I of course need to support the registration and upload features of setup.py, which uses distutils for those actions. One thing making this a bit more difficult than need be is the fact that distutils.command.register and distutils.command.upload both use bare line feeds as a line terminator in the HTTP message headers. While there are probably tolerant servers out there, I think this behavior should be considered a bug in light of the HTTP spec, which reads: 

"The line terminator for message-header fields is the sequence CRLF. However, we recommend that applications, when parsing such headers, recognize a single LF as a line terminator and ignore the leading CR."

The second sentence can be interpreted in multiple ways that either agree with or contradict the first sentence, but the first sentence is at least perfectly clear, and I'd like to see "\r\n" added to the beginning of (specifically in this case) the Content-Disposition headers assembled by distutils.command.upload and distutils.command.register.  

The change involves taking identical lines in each file that currently look like this: 


           title = '\nContent-Disposition: form-data; name="%s"' % key

...and making them look like this: 


           title = '\r\nContent-Disposition: form-data; name="%s"' % key

The result is that servers which do not support a lax adherence to the protocol will still be able to support users of distutils in Python 2.6, 2.7, and 3.1 (and maybe others).