To get any data you have to specify a server.
Specifiy one by putting the name in a parameter called 'server'.

If your http accept request header includes application/json or a parameter named json is set the returned data is formatted as JSON, otherwise the data will be returned as a series of javascript variables simply because that was my original solution.

Regarding unavailable language, population, and type: On january 30th 2018 this informations was removed from the official server status page so it is unfortunatly no longer available. The variables remain for compatibility and in case the would ever return to the status page. Biorware's official post on this can be found here.

Variables:

• ServerName - Containes the server name.
• ServerState - Contains the server state. UP, DOWN, MAINTENANCE or UNKNOWN (for rare cases).
• ServerRegion - Contains the server region. US or Europe.
• ServerLanguage - Used to contain the server language for European and Oceanic server, for US servers this will instead contain the timezone.
• ServerPopulation - Used to contain the current server population, light, standard, heavy and so on.
• ServerType - Used to contain server type, e.g PVP, RP-PVE.
• CacheTime - Contains the date and time when the data returned was gathered and cached from swtor.com.
• ErrorMsg - In case of any errors this contains an error message.