如何使用Node.js的HTTP代理Redis的回調

Question

內考慮這個不完整的片段：

var util = require('util'), 
    nconf = require('nconf'), 

    http = require('http'), 
    httpProxy = require('http-proxy'), 

    express = require('express'), 
    repoServer = express.createServer(), 

    redis = require('redis'), 
    redisClient = redis.createClient(); 

// (...) 

var proxy = new httpProxy.RoutingProxy(); 
http.createServer(function (req, res) { 
    console.log("URL", req.url); 
    if (req.url) { 
    var token = req.url.split("/")[1]; 

    // if I leave this code here it works fine 
    // var target = { host: 'local-01', port: 8024 } 
    // proxy.proxyRequest(req, res, target); 

    // now I need to retrieve some routing information 
    // from redis, so I query redis here 
    redisClient.get(token, function (err, reply) { 
     // if I leave this code here the request hangs 
     var target = { host: 'local-01', port: 8024 } 
     proxy.proxyRequest(req, res, target); 
    }); 
    } 
}).listen(routerInfo.port, routerInfo.address); 

爲什麼，當我打電話去Redis的客戶端外proxyRequestget回調它的工作原理，但是當我移動電話內回調失敗，HTTP請求掛起？

Answer 1

請求流，也許你希望緩衝

見：https://github.com/nodejitsu/node-http-proxy/blob/master/examples/http/latent-proxy.js