java.net.URL barfs on custom URL schemes, and making it handle them is
really hard. Basically, there needs to be a Handler stub class, then
URL.setURLStreamHandlerFactory() must run when F-Droid starts, since
it has to be set before any URL instance is used. This all leaves
some weird logic that gives the false impression that URLConnection
will handle these custom schemes.
Switching to Uri/urlString throughout the code matches the other
classes that use urlString as the unique ID, and this doesn't add more
lines of code.
df08e84e78