cwclientlib #4442540 provide higher level objects to work with the connection [rejected] is nice, but too low-level.

We might want an API to connect to an instance, and process rql queries, that is reminiscent of, and close to the standard cubicweb connection object.

So HTTPCnx is an object providing:

* self.execute
* which may return resultsets (without the orm) and raise RemoteValidationFailed errors

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