XmlHttpRequest w/ compression support

ajax-call-with-compression.js

// typical generic request routine (handles GET and POST)
function makeRequest(href, next, body, contentType) {
    var ajax;

    ajax=new XMLHttpRequest();
    if(ajax) {

      ajax.onreadystatechange = next();

      if(body) {
        ajax.open('post',href,false);
        ajax.setRequestHeaders('content-type',contentType);
        ajax.setRequestHeaders('accept-encoding','gzip');
        ajax.send(body);
      }
      else {
        ajax.open('get',href,false);
        ajax.setRequestHeaders('accept-encoding','gzip');
        ajax.send(null);
      }
    }
  }

Thanks Mamund, but it should be:

ajax.setRequestHeader('accept-encoding','gzip');

Also, I get this error from Chrome:

Refused to set unsafe header "accept-encoding"

Using Content-Encoding: gzip in the request headers does not work. Discussed here: http://stackoverflow.com/a/10346303/362271

Accept-Encoding is one of forbidden header name.
See https://developer.mozilla.org/en-US/docs/Glossary/Forbidden_header_name