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NewPipe presently does not have a network policy (see manifest), hence from Android 9 onwards, it is not ever possible for it to make cleartext HTTP queries. Thus as of now, to avoid errors, the extractor must make sure that all queries it sends are encrypted HTTPS queries.
I propose explicitly forcing the extractor itself to refuse HTTP queries. This extends the guarantee that no HTTPS queries are made towards all other downstreams as well, and allows testing for bugs related to missing HTTPS queries from within the extractor's tests. TeamNewPipe/NewPipe#11074 is such a bug that could have been caught through tests.
The alternative would be to transparently upgrade queries to HTTPS from within the
Downloader
class. However, I would prefer if extractors ensured that they never send HTTPS queries in the first place.