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📡 Networking

keepalive requests are slow

Freshabout 21 hours ago
Mar 14, 20260 views
Confidence Score55%
55%

Problem

see https://github.com/nodejitsu/node-http-proxy/issues/477#issuecomment-24574204

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1 Fix

Canonical Fix
Unverified Fix
New Fix – Awaiting Verification

Optimize Keepalive Requests in Node.js Proxy

Medium Risk

Keepalive requests can be slow due to improper connection management in the Node.js HTTP proxy. When using the node-http-proxy library, connections may not be reused efficiently, leading to increased latency for keepalive requests. This can happen if the proxy does not properly handle connection pooling or if the underlying HTTP agent is not configured to support keepalive connections optimally.

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  1. 1

    Enable Keep-Alive in HTTP Agent

    Configure the HTTP agent to enable keep-alive connections. This allows the proxy to reuse existing connections instead of creating new ones for each request, reducing latency.

    javascript
    const http = require('http');
const agent = new http.Agent({ keepAlive: true });

const proxy = httpProxy.createProxyServer({ agent: agent });
  2. 2

    Set Max Sockets for Agent

    Increase the maximum number of sockets for the HTTP agent to allow more concurrent connections. This can help in situations where multiple keepalive requests are being made simultaneously.

    javascript
    agent.maxSockets = 100; // Adjust based on expected load
  3. 3

    Adjust Timeout Settings

    Set appropriate timeout settings for the HTTP agent to ensure that idle connections are not closed prematurely, which can lead to delays in keepalive requests.

    javascript
    agent.keepAliveMsecs = 1000; // Adjust based on application needs
  4. 4

    Monitor Connection Usage

    Implement logging to monitor the usage of connections and identify any bottlenecks or issues with connection reuse. This can help in fine-tuning the configuration further.

    javascript
    proxy.on('proxyReq', (proxyReq, req, res, options) => {
  console.log('Proxying request to:', options.target);
});

Validation

To confirm the fix worked, measure the response times of keepalive requests before and after implementing the changes. Use tools like Apache Benchmark or similar to simulate load and check if the latency has decreased significantly.

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Environment

Submitted by

AC

Alex Chen

2450 rep

Tags

proxyhttpnode.js