code: function setOverrideHeader(res, name, value) {
  
    if (res._headers && res._headers[name] !== undefined) {
      return true;
    }
  
    res.setHeader(name, value);
    return true;
  }
docs: set override header on response
  
  @function setOverrideHeader
  @param {Object} res - response to client
  @param {String} name - header's name
  @param {String} value - header's value
  @return {Boolean}