postgres access over the web

We have a successful implementation of a web page hosted on another provider. We are able to access our postgres database using javascript that calls python and uses psycopg2 to create a database connection. with that provider there seems to be less restrictions on access to the DB.

On Digital Ocean After much research I realized I had to create a specific user in the postgres DB to allow access from a linux user:

For Example postgres Database: database db1 Schema Public Tables: testtable (owner root) have granted full access on all tables to user jim ( also have a linux user jim)

In linux I can su to user jim and log into the database and see table testtable.

Now…

When I attempt to run the query through the web browser it seems like the connection is failing. I have also created a postgis user called “www-data” and granted full access to the tables.

I assumed was the browser user is using as user www-data.

So… The questions I have are:

1. Am I correct in assuming that the web calls are made by “www-data”?
2. Does it sound like Is there something I have not configured to allow DB access from web/javascript/python?

Much thanks in advance: