Implementation returns undocumented status code 400

[mvanbrab]

Detected in version

commit 5205e36 on branch development

How to trigger

Start:

yarn start -c example/config.yaml

Get (in new terminal window)

# 200, no problem here:
wget http://localhost:3000/artist/David%20Bowie?writer=John%20Lennon
# 400, because of missing parameter:
wget http://localhost:3000/artist/David%20Bowie

Proposed solution

• Keep code assigning status 400 (in handlers/request-handler.js)
• Modify appropriate wrong test description (in test/test.js) 'should return status 404 when the GraphQL-LD query's required variables were not given'
• Handle status code 400 in all appropriate configuration(s)
• Document status 400 in README.md