node.js 如何通过添加其他参数来重定向传入的 URL 请求

How to redirect incoming URL requests by adding additional parameters

提问by Pradeep Banavara

Problem: I get an incoming HTTP request to my server application. The request is something like this : http://example.com?id=abc. I need to parse this request, patch additional URL parameters and call a hosted html file. So:

问题：我的服务器应用程序收到一个传入的 HTTP 请求。请求是这样的：http: //example.com?id=abc。我需要解析这个请求，修补额外的 URL 参数并调用一个托管的 html 文件。所以：

http://example.com?id=abc=> http://example.com:8080/temp.html?id=abc&name=cdf.

http://example.com?id=abc=> http://example.com:8080/temp.html?id=abc&name=cdf。

So the client should see temp.html

所以客户端应该看到 temp.html

Here's the code:

这是代码：

function onRequest(request,response) {
if(request.method =='GET') {
        sys.debug("in get");
        var pathName = url.parse(request.url).pathname;
        sys.debug("Get PathName" + pathName + ":" + request.url);
        var myidArr = request.url.split("=");
        var myid = myidArr[1];
        //Call the redirect function
        redirectUrl(myid);
}
http.createServer(onRequest).listen(8888);

function redirectUrl(myid) {
var temp='';
    var options = {
      host: 'localhost',
      port: 8080,
      path: '/temp.html?id=' + myid + '&name=cdf',
      method: 'GET'
    };
  var req = http.request(options, function(res) {
    console.log('STATUS: ' + res.statusCode);
    console.log('HEADERS: ' + JSON.stringify(res.headers));
    res.setEncoding('utf8');
    res.on('data', function (chunk) {
      temp = temp.concat(chunk);
    });
    res.on('end', function(){
        return temp;
      });
    });
  req.end();
  return temp;
}

Even though this is a really stupid way of going about this issue, I do see the response in the res.end() callback. How to propagate this to the parent calling function onRequest ?

尽管这是解决此问题的非常愚蠢的方法，但我确实在 res.end() 回调中看到了响应。如何将此传播到父调用函数 onRequest ？

Is there a simpler way of doing this just using node ? I know that there are ways to serve static html files. However, I need to pass URL parameters to temp.html - so I'm not sure how to do this.

是否有一种更简单的方法可以仅使用 node 来做到这一点？我知道有一些方法可以提供静态 html 文件。但是，我需要将 URL 参数传递给 temp.html - 所以我不确定如何执行此操作。

回答by almypal

Just wondering if a simpler redirect would serve the purpose:

只是想知道更简单的重定向是否可以达到目的：

  function onRequest(request,response) {
    if(request.method =='GET') {
       sys.debug("in get");
       var pathName = url.parse(request.url).pathname;
       sys.debug("Get PathName" + pathName + ":" + request.url);
       var myidArr = request.url.split("=");
       var myid = myidArr[1];
       var path = 'http://localhost:8080/temp.html?id=' + myid + '&name=cdf';
       response.writeHead(302, {'Location': path});
       response.end();
    }

回答by alessioalex

This is a classical error when coming to the async world. You don't returnthe value of the file, you pass a callback as a parameter and execute it with the end value like so:

这是进入异步世界时的经典错误。您不知道return文件的值，而是将回调作为参数传递并使用最终值执行它，如下所示：

function proxyUrl(id, cb) {
  http.request(options, function(res) {
    // do stuff
    res.on('data', function (chunk) {
      temp = temp.concat(chunk);
    });
    res.on('end', function(){
      // instead of return you are using a callback function
      cb(temp);
    });
}

function onRequest(req, res) {
  // do stuff
  proxyUrl(id, function(htmlContent) {
    // you can write the htmlContent using req.end here
  });
}

http.createServer(onRequest).listen(8888);

回答by Linus Gustav Larsson Thiel

You have to pass the original responseto your redirectUrlfunction, and let it write to the response. Something like:

您必须将原始文件传递response给您的redirectUrl函数，并让它写入响应。就像是：

function redirectUrl(myid, response) {
  var options = {
    host: 'localhost',
    port: 8080,
    path: '/temp.html?id=' + myid + '&name=cdf',
    method: 'GET'
  };
  var req = http.request(options, function(res) {
    console.log('STATUS: ' + res.statusCode);
    console.log('HEADERS: ' + JSON.stringify(res.headers));
    res.setEncoding('utf8');

    // Proxy the headers
    response.writeHead(res.statusCode, res.headers);

    // Proxy the response
    res.on('data', function (chunk) {
      response.write(chunk);
    });
    res.on('end', function(){
        response.end();
      });
    });
  req.end();
}

Calling it:

调用它：

redirectUrl(myid, response);

Also, since you're already parsing the url, why not do:

另外，既然您已经在解析 url，为什么不这样做：

var parsedUrl = url.parse(request.url, true);
sys.debug("Get PathName" + parsedUrl.pathname + ":" + request.url);
//Call the redirect function
redirectUrl(parsedUrl.query.id, response);