The MP3tunes Oboe service has a set of servers dedicated to specific tasks, and it is important that when using the API you use the correct servers for specific types of requests. These servers are separated by mp3tunes.com subdomains. Each request method's documentation will list the correct subdomain to use for that method. Currently there are three subdomains, and respectively three types of requests.
Servers
API methods which deal with authentication (SSL) use the https://shop.mp3tunes.com/ domain.
General API methods use the http://ws.mp3tunes.com/ domain.
Storage API methods use the http://content.mp3tunes.com/ domain.