is it http or https? - use these adapters
is it not? - pick the first one in the list of 'preferred adapters'
this means, if you're using PouchDB core + manually added adapters the order which you add them in makes a difference.
Browser setup is here, and the Node setup is here
- pouchdb core
- indexed/level db adapter depending on browser or node
- http adapter
- mapreduce package
- replication package