[MERGE] Exception when pulling from a location

[Aaron Bentley]

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Andrew Bennetts wrote:
> Some quick 2c from me:
>  * HTTP at least makes it possible to put a bundle at a URL ending in /.
> I don't know if we care or not.

Our recommended pastebin uses trailing slashes, so it's actually pretty
easy to have that happen:
http://paste.ubuntu.com/199190/plain/

I think we should get rid of the heuristic.

>  * the change of handling to ConnectionError sounds reasonable to me,
> although I haven't looked at it very closely.
> """]

I think that this is papering over a bug in transports.  I'd rather see
it fixed in the transports, but I wouldn't block it being merged.

Aaron
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