HTML: Accept-Charset attribute and Accept attribute

Question

I'm using angularJS, and when i try to set there Accept-Charset attribute i get: Refused to set unsafe header "Accept-Charset", but when i set manually something like:

    headers: {
      'Content-Type': 'text/csv',
      'Accept': 'application/json, text/plain; charset=WIN-1251'
    }

all is ok

so... question)

Is there any difference between this two attributes? or server will recognize my accept with charset, and i do not need Accept-Charset anymore?