# invalid
node mock-census.js
node mock-census.js files:///path/to/file
node mock-census.js httpss://domain.tld/resource
# valid
node mock-census.js /path/to/file
node mock-census.js file:///path/to/file
node mock-census.js http://domain.tld/resource
node mock-census.js https://domain.tld/resource