ResourceWarnings about unclosed sockets

[twm]

Observed while checking feeds in development:

<4>[twisted.logger._global] /usr/lib/python3.5/urllib/parse.py:360: builtins.ResourceWarning: unclosed <socket.socket fd=41, family=AddressFamily.AF_INET, type=2049, proto=0, laddr=('...', 45076), raddr=('...', 80)>
<4>[twisted.logger._global] /usr/lib/python3.5/urllib/parse.py:360: builtins.ResourceWarning: unclosed <socket.socket fd=43, family=AddressFamily.AF_INET, type=2049, proto=0, laddr=('...', 40292), raddr=('...', 443)>
<4>[twisted.logger._global] /usr/lib/python3.5/urllib/parse.py:360: builtins.ResourceWarning: unclosed <socket.socket fd=22, family=AddressFamily.AF_INET, type=2049, proto=0, laddr=('...', 45072), raddr=('...', 80)>

The file and line listed for the warning don't seem to have any real meaning. Presumably that is just where garbage collection was triggered.

This is concerning because these sockets most likely originate somewhere within feedparser or one of the libraries it uses. Could this be kurtmckee/feedparser#107?