Dangling response on raise util.JobError

Hi guys.

So been testing with CKAN in different platforms and currently I have two cases where CKAN just blocks after upload a large file.
I was able to trace back to the datapusher and eventually saw it block on:

`if cl and int(cl) > MAX_CONTENT_LENGTH:
raise util.JobError(..)`

So I made fork of CKAN and added with the latest's datapusher and made it build with docker-compose and its available here: https://github.com/lmmaia/ckan/tree/2.9

Also this uses postgresql, very lazy build but I think it works to exclude other possible known errors with sqllite.

To overcome the error I just replaced the raise util.JobError with a Exception(...), but still I couldn't figure out why the dangling just in some machines.

Best regards.