CodeA,
I use the same techniques in my APP. Remote Db access is not automatically supported in M1.
However through some custom local and server side coding one can send and receive URL responses and achieve the kind of exchange you are talking about.
There are two ways I have been doing it:
1. via a form setup using the GET or POST form methods
2. via JQuery in the code by directly manipulating the URL and its response.
The fact that your service replies are JSON and/or XML makes it easy to handle the responses in the code.
Attached is a small demo program showing the JQ method:
https://drive.google.com/file/d/0B4ojr4ueF89DUFlRQ083VFptRkE/edit?usp=sharing
Enter any URL from your service into the text entry area and press SUBMIT.
Should see the incoming response in the window below.
The JS code is in the SUBMIT button On-Click section.
Hope it helps,
TG