This makes the PSR-7 interface for the MWHttpRequest available to all
consumers that want to make use of it. This is of general utility and
should not be limited to Wikibase. Also, it allows us to drop the Guzzle
dependency from Wikibase entirely.
As an alternative to moving the adapter (as is done with this patch), it
was considered to refactor MWHttpRequest to support the interface
directly. While that would come without the overhead of an additional
class, it would require adding the interface methods to an already large
class and deprecating the now redundant legacy methods. This would be an
invasive refactoring that would not only affect the classes inheriting
from MWHttpRequest, but also its consumers.
It would seem that a conceptual refactoring of that magnitude would
require a more substantial consensus among contributors (and maybe
consumers) of these classes. Moving this adapter is seen as a step in
building the case for why using standardized interfaces is a good idea
and allowing for the discussion to be grounded of incorporating an existing
adapter into a base class rather than the hypothetical discussion of
adjusting it to an so far unused interface.
Bug: T263989
Depends-On: I56ad52b561460121a8c84313cbd431dc811e2ae1
Change-Id: I2a27dead1d5f1403b8d255c5daf9ba5e7c313476
