如何将请求转发到 node.js 中的其他端点
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How to forward a request to other endpoint in node.js
提问by mjimcua
In my scenario I need forward get request to another end point. In my machine there are two servers php and node.js server. Node.js is like a "man in the middle", PHP server must work in the same way.
在我的场景中，我需要将 get 请求转发到另一个端点。在我的机器上有两台服务器 php 和 node.js 服务器。Node.js 就像一个“中间人”，PHP 服务器必须以同样的方式工作。
Node.js server code
Node.js 服务器代码
var express = require('express');
var fs = require('fs');
var path = require('path');
var http = require('http');
var https = require('https');
var app = express();
var HTTP_PORT = 3000;
// Create an HTTP service
http.createServer(app).listen(HTTP_PORT,function() {
console.log('Listening HTTP on port ' + HTTP_PORT);
});
//endpoint for tracking
app.get('/track', function(req, res) {
sendRequestToOtherEndPoint(req);
processRequest(req);
res.setHeader('Content-Type', 'application/json');
res.send('Req OK');
});
function processRequest(req){
console.log("request processed");
}
function sendRequestToOtherEndPoint(req){
//magic here :)
}
When this server receive a get request in port 3000, it process request information and it must forward the same requesto to another end point.
当这个服务器在 3000 端口收到一个 get 请求时，它会处理请求信息，并且它必须将相同的请求转发到另一个端点。
For example:
例如：
- Get localhost:3000/track?param1=1¶m2=2
- Server process get request
- Server forward get request to localhost/final-endpoint?param1=1¶m2=2
- 获取 localhost:3000/track?param1=1¶m2=2
- 服务器进程获取请求
- 服务器转发获取请求到 localhost/final-endpoint?param1=1¶m2=2
采纳答案by kmandov
Depending on what you're trying to do, you can create a new request to the end-point:
根据您尝试执行的操作，您可以向端点创建一个新请求：
//endpoint for tracking
app.get('/track', function(req, res) {
req.get({url: 'http://end-point', headers: req.headers});
processRequest(req);
res.setHeader('Content-Type', 'application/json');
res.send('Req OK');
});
More info: https://github.com/request/request
回答by sohel khalifa
In you case res.redirectmight help.
在你的情况下res.redirect可能会有所帮助。
app.get('/track', function(req, res) {
// process the request
// then redirect
res.redirect('/final-endpoint');
});
Then catch the redirected request in final endpont.
然后在最终端点中捕获重定向的请求。
app.get('/final-endpoint', function(req, res) {
// proceess redirected request here.
});
See the Express docs
回答by cjol
If your second endpoint is on a different server, (e.g. PHP) then you're going to need to either redirect the client (as in sohel's answer), or spoof a request from Node to the PHP server and then send the response back to the client. This latter option is definitely non-trivial so I would question whether it's crucial not to use a client redirect.
如果您的第二个端点在不同的服务器上（例如 PHP），那么您将需要重定向客户端（如sohel 的回答），或者将请求从 Node 欺骗到 PHP 服务器，然后将响应发送回客户端。后一个选项绝对不是微不足道的，所以我会质疑不使用客户端重定向是否至关重要。
If you're talking about two express endpoints, then I think the simplest answer might be not to actually forward at all, but just use the endpoint callback directly instead:
如果您在谈论两个快速端点，那么我认为最简单的答案可能是根本不实际转发，而是直接使用端点回调：
app.get('/track', trackCallback);
app.get('/otherendpoint', otherendpointCallback);
function otherendpointCallback(req, res) {
// do your thing
}
function trackCallback(req, res) {
otherendpointCallback(req, res);
processRequest(req);
res.setHeader('Content-Type', 'application/json');
res.send('Req OK');
};
Depending on exactly what you want to do at the other end point, you might need to spoof some of req's fields (e.g. req.url)
根据您想要在另一个端点执行的确切操作，您可能需要欺骗req's 的某些字段（例如req.url）
