Make adapters PSR-7 compliant

[ddeboer]

As discussed in php-http/guzzle6-adapter#1: there should only be only one adapter interface and that will take PSR-7 request objects and return PSR-7 response objects. So we need to:

• remove the HttpAdapter
• rename PsrHttpAdapter to HttpAdapter(?)
• create a separate client package that will contain the convenience methods currently in HttpAdapter (get()/post() etc.).

If we follow this road, are the internal_separation still relevant? Or can we start work on this right away?

[sagikazarmark]

It is definitely relevant as it contains some changes that needs to be backported. Also, the separation itself is step one to remove the internal request thing from the adapters.

[ddeboer]

Okay, so let’s first get the internal_separation branches merged, and then continue with cleaning up the adapter interfaces.

[sagikazarmark]

Yeah.

[sagikazarmark]

I am planning to merge those branches by the end of the week.

[ddeboer]

Cool! Let me know when you have done that. I’ll write a PR after that to clean up the Adapter interfaces with the Guzzle 6 adapter as a (very simple) testcase.