This is a real
FAQ on the internet -
how much data can you input into a browser GET request? - and there's no definite answer.
It seems to be dependant on the
browser as well as the
web server configuration.
With a WebView accessing local files there is no web server so the limit is purely down to the WebView limits.
I've seen reports of 2MB GET requests with a WebView and there's no problem.
Google is your
friend!
Martin.