src/Tunnel.js
function addExtraHeaders(request, headers) {
        for (var name in headers) {
            request.setRequestHeader(name, headers[name]);
        }
    }
function addExtraHeaders(request, headers) {
        for (var name in headers) {
            request.setRequestHeader(name, headers[name]);
        }
    }
function addExtraHeaders ( request , headers ) { for ( var name in headers ) { request . setRequestHeader ( name , headers [ name ] ) ; } }
Adds the configured additional headers to the given request.

@param {XMLHttpRequest} request
The request where the configured extra headers will be added.

@param {Object} headers
The headers to be added to the request.

@private
Adds the configured additional headers to the given request .