GET /path/to/service?user=foo&pass=bar HTTP/1.1
Host: foobar.com

HTTP/1.1 200 OK
[other headers]
Content-Type: text/plain

Error: Username/password invalid


##</code><code>##

GET /path/to/api?name1=value1&name2=value2 HTTP/1.1
Host: foobar.com
Authorization: Basic Zm9v0mJhcg==

HTTP 401 Unauthorized
[Other headers]

[Optional return data]