While all official/standardized ES2+ API functions use POST, there
are some vendor-specific extensions using different HTTP methods. Be
flexible enough to allow derived classes to easily specify other methods.
Change-Id: I4b1a0dc7e6662485397c7708933bf16e5ed56e10
Usually, the specifications say that the integer type is actually
transmitted as a JSON string type. However, it seems some
implementations do return a native JSON integer type. Let's be
tolerant in that regard.
Change-Id: I5b47f8bba01225d53eff2ca086e53a2133abed7f
