Socket Hang Up Error

Retry failed requests with increasing delays between attempts.

async function fetchWithRetry(url, options, retries = 3) {
  for (let i = 0; i < retries; i++) {
    try {
      const res = await fetch(url, options)
      if (!res.ok) throw new Error(`HTTP ${res.status}`)
      return res
    } catch (err) {
      if (i === retries - 1) throw err
      const delay = Math.pow(2, i) * 1000
      console.log(`Retry ${i + 1}/${retries} after ${delay}ms`)
      await new Promise(r => setTimeout(r, delay))
    }
  }
}

Ensure timeout values are appropriate for the server's expected response time.

// Node.js HTTP agent keep-alive
const http = require("http")
const agent = new http.Agent({ keepAlive: true })

// Fetch with timeout
const controller = new AbortController()
const timeout = setTimeout(() => controller.abort(), 30000)
fetch(url, { signal: controller.signal, agent })

A socket hang up during request processing often means the server crashed.

# Check Node.js error logs
pm2 logs
journalctl -u myapp

# Check for out-of-memory errors
dmesg | grep -i "killed process"

Reuse connections with keep-alive to avoid establishing new connections for each request.

const keepAliveAgent = new https.Agent({ keepAlive: true })
// Reuse the same agent across requests
fetch(url1, { agent: keepAliveAgent })
fetch(url2, { agent: keepAliveAgent })