Allow me to ask how to or if I could do these things from the browser:
1. Create links to annotations of EPUB from JSON Request in XHR POST like the one in markdown export i.e
http://127.0.0.1:8080/#book_id=12&bo.../12/2/4/2/20/4[f000006]/1:4%29&fmt=EPUB&library_id=Audio-eBooks&mode=read_book
2. Get metadata from a library like a direct SQL query from metadata.db i.e
'SELECT title FROM books'.
Or overall how to structure HTTP Protocol for the Content Server.
3. Add/Modify notes of a particular highlight of the book from the client console instead of the UI.