Node.js所有请求的静态头(Node.js static header for all requests)

 我想在node.js服务器中为所有传入请求设置静态头。 我目前的方法是为每个请求添加相同的4行标题（代码重复），我想解决这个问题，这里是我要添加的标题的一个示例： 
 
app.post('/postJob', function(req,res){
    console.log("request method :" + req.method);
    // Website you wish to allow to connect
    res.setHeader('Access-Control-Allow-Origin', '*');

    // Request methods you wish to allow
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');

    // Request headers you wish to allow
    res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');

    // Set to true if you need the website to include cookies in the requests sent
    // to the API (e.g. in case you use sessions)
    res.setHeader('Access-Control-Allow-Credentials', true);
    res.setHeader('Content-Type', 'application/json');
 
 有人知道定义它的方法吗？ 

I want to set a static header for all incoming request in my node.js server. My current way is to add for each request the same 4 lines of header(code duplication) and i want to fix that, here is one example of the header i want to add :
 
app.post('/postJob', function(req,res){
    console.log("request method :" + req.method);
    // Website you wish to allow to connect
    res.setHeader('Access-Control-Allow-Origin', '*');

    // Request methods you wish to allow
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');

    // Request headers you wish to allow
    res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');

    // Set to true if you need the website to include cookies in the requests sent
    // to the API (e.g. in case you use sessions)
    res.setHeader('Access-Control-Allow-Credentials', true);
    res.setHeader('Content-Type', 'application/json');
 
Someone knows a way to define that ?

原文：https://stackoverflow.com/questions/29058987