Missing 'content-length' causes KeyError
Verified fixed head of develop.
The reason for this, in the case of this particular entity, was that accessing its URL returned an HTTP response with Transfer-Encoding : chunked and therefore no Content-Length header.
Not sure if this is entirely kosher, but I changed the offending line of code default to the length of the response's content:
...and that seems to work.
I'm still getting a KeyError, expected it would work like (note: stack trace is