accept.sh

# foo/bar isn't accepted 
$ curl -I -H "Accept:foo/bar" "https://api.meetup.com/meetup-api-testing?key=$API_KEY"
HTTP/1.1 406 Not Acceptable

# ...but application/json is
$ curl -I -H "Accept:application/json" "https://api.meetup.com/meetup-api-testing?key=$API_KEY"
HTTP/1.1 200 OK

# curl sents */* by default
$ curl -v -I "https://api.meetup.com/meetup-api-testing?key=$API_KEY"
(snip)
> User-Agent: curl/7.37.1
> Host: api.meetup.com
> Accept: */*
>
< HTTP/1.1 200 OK