Determine the Accept-Language HTTP request header using Javascript — or otherwise determine the user’s preferred language(s)

Question

I'd like use Javascript to find out my browser's default HTTP Accept-Language that it sends in an HTTP request. I'm aware that Javascript's XMLHTTPRequest Object has a getResponseHeader() method. Does it have a similar method for getting request headers? Or is there another way I can determine my browser's HTTP request header?

• Allen G: Possible duplicate of: stackoverflow.com/questions/220149/…
• Brinley: It's not a duplicate. stackoverflow.com/questions/220149/… wanted to know User-Agent and Referrer. I'm want Accept-Language
• user2226755: stackoverflow.com/questions/1043339/… ?
• sideshowbarker: As far as the general question of getting access to request headers from your frontend JavaScript code, see the part of the answer at stackoverflow.com/a/220175/441757 which says, "Almost by definition, the client-side JavaScript is not at the receiving end of a http request, so it has no headers to read.". You can’t get access from your frontend code to headers that the browser itself sets after evaluating and executing your frontend code. In other words, your frontend code executes before the request headers are set.
• Heretic Monkey: Possible duplicate of Best way to determine user's locale within browser

Answer 1

The main language :

navigator.language

All languages :

navigator.languages