title: "failed to get context" error against real server, works fine with mockserver
body: <p>Following the <a href="https://openui5.hana.ondemand.com/topic/bcdbde6911bd4fc68fd435cf8e306ed0" rel="nofollow noreferrer">ODATA V4 tutorial</a> in step 2: app runs against mockserver, tips are given to run it against a real server. Used the existing index.html as test/mockServer.html and created a new index.html, pointing to ComponentSupport for oninit. Added cors-anywhere and adjusted the manifest. Works well, both mockserver and real.</p>
  <p>That was in step 2 and the app worked fine also against a real server. Fast-forward to step 5 and I notice the app fails to load any data when running against a real server. <a href="https://github.com/AndreaBorgia-Abo/tutorial_openui5/commit/9d1d1f052b212138ae93b2629719edfb5333977b" rel="nofollow noreferrer">Long story short</a>, the <a href="https://services.odata.org/TripPinRESTierService/(S(id))/People?$count=true&amp;$select=Age,FirstName,LastName,UserName&amp;$skip=0&amp;$top=10" rel="nofollow noreferrer">backend</a> is throwing an error, not even &quot;count&quot; together with &quot;top&quot; is accepted. I checked the <a href="https://www.odata.org/getting-started/basic-tutorial/#count" rel="nofollow noreferrer">docs for ODATA</a>, &quot;count&quot; does not seem to be an exclusive option.</p>
  <p>Am I fundamentally misunderstanding the way ODATA works? I am especially puzzled by the fact that the mockserver runs fine.</p>
  <p>EDIT: <a href="https://github.com/SAP/openui5/issues/3041" rel="nofollow noreferrer">created bugreport</a></p>