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In ``Lib/distutils/command/register.py`` as well as ``upload.py``, the following code exists to build the HTTP request body to send to the cheese shop server:
 body.write('\nContent-Disposition: form-data; name="%s"'%key)
 body.write("\n\n")
RFC2616 page 31 (http://tools.ietf.org/html/rfc2616#page-31) states that headers must be separated by CRLF. Specifically, the above "\n\n" for the header separator is causing issues with some minimal RFC-compliant web servers.

Patch attached.

Hi Mitchell, thanks for your interest in Python. Using CLRF was requested before (#10510) and rejected on the ground that the RFC (at least for HTTP 1.0) allows LF. CRLF is preferred but not required. Hence, we deem it is not a bug.
The register, upload and upload_docs commands in distutils2 do use CRLF.
BTW, I think your patch was incomplete: You stripped one newline, replaced one LF with CRLF, and left many other LFs.

http://tools.ietf.org/html/rfc2616#section-3.7.1
> When in canonical form, media subtypes of the "text" type use CRLF as
> the text line break. HTTP relaxes this requirement and allows the
> transport of text media with plain CR or LF alone representing a line
> break when it is done consistently for an entire entity-body. HTTP
> applications MUST accept CRLF, bare CR, and bare LF as being
> representative of a line break in text media received via HTTP

Will close if no further input.

The requests we send are multipart/form-data, so the RFC exception for text/* would not apply. I’m closing this bug as a duplicate and will ask on the other one if we should reopen it.