Testing SEC JSON variants for content type
 https://www.sec.gov/files/county.json?output=1
https://www.sec.gov/files/county.json?callback=foo
https://www.sec.gov/files/county.json?jsonp=foo
https://www.sec.gov/files/county.json?format=text
https://www.sec.gov/files/county.json?type=txt
https://www.sec.gov/files/county.json?download=1
 https://www.sec.gov/files/county.json?source=.txt
https://www.sec.gov/files/county.json?foo=.txt
https://www.sec.gov/files/county.json?alt=media
https://www.sec.gov/files/county.json.json.txt
https://www.sec.gov/files/county.json?raw=1
https://www.sec.gov/files/county.json?_=1
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