Attribute set via response hooks does not work with ProcessPoolExecutor about requests-futures

[ross]

For the most part ProcessPoolExecutor is caveat emptor as passing python objects around between processes can be tricky and a lot of times the stuff that gets run into can't be addressed by requests_futures (as it's actually problems with underlying libraries.)

My only thought would be to add some debugging prints in get_translation to see if it's even getting called. It's possible requests session hooks don't make it over into the other process correctly.

[nickryand]

I think I have tracked this down to behavior with pickle. Pickle calls a couple of methods dealing with getting and setting state during the marshal and unmarshal process. My guess is requests Response object does not handle that use case.

I'll dig more. I don't know if there is a good fix for this if you are trying to keep support for older versions of python.

[ross]

Ah, yeah that's exactly the sort of problem that's been run into a number of times over the years. It'd require requests fixing it as I don't really have the ability to make its objects pickle-able w/o some really nasty monkey patching that I wouldn't even consider doing.

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