Error responses ignore accept header

[gholt]

In swob.py it would seem the default response bodies are always wrapped in html boilerplate, no matter the request's accept header.

[Gil Vernik (gilv)]

@gholt; Before i start working on this one i want better understand what we want to achieve here. So if Accept: application / json than you expect swob to return an exception in JSON, like
{ 'title': 'xxx', 'description:'yyyy'}
?
All existing Swift customers and their various client tools currently expect HTML error and now they will receive JSON.
There is no doubt about the bug you reported, but still - do we really want to change existing API? i am a bit concern about it..
What do you think about?

[John Leach (johnleach)]

We've just hit this ourselves, recognised it as a bug and anticipated it may be fixed in future so our code expects json but handles html if it's given.

It seems this is a reasonable decision for someone developing a client, nicely in line with Postel's law. So can we assume all client developers did this and fix it in Swift? :)

[Azhagu Selvan SP (tamizhgeek)]

I have the the first cut fix here:

https://review.openstack.org/#/c/204196/

Please comment.

[clayg (clay-gerrard)]

I sometimes notice something like this come up - making the errors and their bodies better - but I don't think anyone is seriously tracking it changing anytime soon.