[MERGE][ping] Better connection sharing for pycurl

[John Arbash Meinel]

Vincent Ladeuil wrote:
> By specifying explicitly the 'Range' header, we avoid the need to
> use two different curl objects (and two connections to the same
> server).
> 
> This has already got a +1 from John. Seeking a second one for
> inclusion.
> 
>         Vincent
> 
> 
> 
...

I think it looks good. But I do have one question about why you only
override 'Expect: ' for POST, whereas bzr was currently overriding it
for all requests.

But otherwise I do still think this should be merged.

John
=:->


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