PouchDB Chrome Console Error when Opening a Connection
That is a test to see if chrome supports a feature so the 404 is expected, annoyingly there is no way to suppress the warning (though there is an issue open in Firefox). We are probably going to start logging messages to the console explaining the "errors" in the mean time because this is a really common issue.
That is PouchDB detecting broken blob URL support in Chrome. It's not an error, so nothing to worry about. :)