nodejs node-http-proxy设置缓存

Question

我正在尝试使用缓存node-http-proxy模块设置 node-http-proxy模块.我已经设法配置node-http-proxy来完成我在代理调用方面需要做的事情,但我想找到一种方法来缓存其中一些调用.

我当前的代码如下(省略一些配置bootstrapping):

var http = require('http');
var https = require('https');
var httpProxy = require('http-proxy');
var proxy = httpProxy.createProxyServer({});
var fs = require('fs');

var handler = function(req, res) {
    proxy.web(req, res, {target: 'http://localhost:9000'});
};

var server = http.createServer(handler).listen(config.children.http.port, function() {
    console.log('Listening on port %d', server.address().port);
});

var secure = https.createServer(config.children.https.options, handler).listen(config.children.https.port, function() {
    console.log('Listening on port %d', secure.address().port);
});

在处理程序函数内部,我希望能够以某种方式捕获代理从"目标"读取的内容并将其流式传输到fs.createWriteStream('/ somepath'),然后再将其传递给res.然后我会修改我的函数来查看沿线的内容:

var handler = function(req, res) {
    var path = '/somepath';
    fs.exists(path, function(exists) {
        if(exists) {
            console.log('is file');
            fs.createReadStream(path).pipe(res);
        } else {
            console.log('proxying');
            // Here I need to find a way to write into path
            proxy.web(req, res, {target: 'http://localhost:9000'});
        }
    });
};

有谁知道如何做到这一点 ？

Answer 1

这个问题的答案最终非常简单:

var handler = function(req, res, next) {

    var path = '/tmp/file';
    fs.exists(path, function(exists) {
        if(exists) {
            fs.createReadStream(path).pipe(res);
        } else {
            proxy.on('proxyRes', function(proxyRes, req, res) {
                proxyRes.pipe(fs.createWriteStream(path));
            });
            proxy.web(req, res, {target: 'http://localhost:9000'});         
        }
    });
};