小编cam*_*cam的帖子

我正在使用Ruby on Rails 3,我正在尝试设置JSON/XML响应的值.

在我的控制器中我有

respond_to do |format|
  format.xml { render :xml => @user.to_xml }
  format.json { render :json => @user.to_json }
end

当我为JSON/XML发出HTTP GET请求时,会设置这些常用值

header: 
  date: 
  - Fri, 18 Feb 2011 18:02:55 GMT
  server: 
  - Apache ...
  etag: 
  - "\"0dbfd0ec23934921144bd57d383db443\""
  cache-control: 
  - max-age=0, private, must-revalidate
  x-ua-compatible: 
  - IE=Edge
  x-runtime: 
  - "0.033209"
  status: 
  - "200"
  transfer-encoding: 
  - chunked
  content-type: 
  - application/json; charset=utf-8 #or application/xml; charset=utf-8
http_version: "1.1"
message: OK
read: true

我想添加/设置header值并添加像message2或的新参数header2.

我怎么能用format.json/xml …