Send all data through query

[kwalcock]

There are pretty much three ways to send data:

• through the URL as before, but uvicorn does not like that
• through the request body, maybe as JSON, but that required too many code changes and makes browser use difficult
• in the query, the stuff after the address and the ? This is what I went with.

It's easy to make a mistake, so testing is important. There seemed to be several things in the front or back that didn't have a counterpart in the other. I tried to change everything for consistency.

[kwalcock]

Check out the interface at http://localhost:8000 that I didn't even know existed!