Is WWW available on all platforms that Unity supports?

Question

Somewhat related to this question I just asked, but I know it isn't good to have multiple questions in one, so making a separate question.

I know Licenses Comparison shows that it is available on all versions (even free) of Unity on all platforms in that list. However, I've found other mistakes/misleading info in that list, so I'd rather hear from someone with experience or someone from Unity.

Also, if I do end up using WWW, I'd need to use a long-polling design (where server waits several seconds, even minutes to reply). Any issues I'll run in to on different platforms?

Main platforms I know I need to target: Windows Store 8 (Surface RT), iOS, Android -- tablets and phones -- probably desktops later (Windows and Mac)

WWW reference

EDIT: I'll be using HTTP and HTTPS in case not obvious (not file: or ftp: protocols).

Answer 1

I have used the WWW-class on PC standalone and Android builds. It worked well with both text and textures. Only platform that requires additional tweaking, that I know of, is the web player where you have to add crossdomain-settings for fetching files.