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Support keepalive http agent.
| Date | Stars |
|---|---|
| 2026-07-31 | 603 |
| 2026-08-06 | 603 |
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# agentkeepalive
[![NPM version][npm-image]][npm-url]
[![Known Vulnerabilities][snyk-image]][snyk-url]
[](https://github.com/node-modules/agentkeepalive/actions/workflows/nodejs.yml)
[![npm download][download-image]][download-url]
[npm-image]: https://img.shields.io/npm/v/agentkeepalive.svg?style=flat
[npm-url]: https://npmjs.org/package/agentkeepalive
[snyk-image]: https://snyk.io/test/npm/agentkeepalive/badge.svg?style=flat-square
[snyk-url]: https://snyk.io/test/npm/agentkeepalive
[download-image]: https://img.shields.io/npm/dm/agentkeepalive.svg?style=flat-square
[download-url]: https://npmjs.org/package/agentkeepalive
The enhancement features `keep alive` `http.Agent`. Support `http` and `https`.
## What's different from original `http.Agent`?
- `keepAlive=true` by default
- Disable Nagle's algorithm: `socket.setNoDelay(true)`
- Add free socket timeout: avoid long time inactivity socket leak in the free-sockets queue.
- Add active socket timeout: avoid long time inactivity socket leak in the active-sockets queue.
- TTL for active socket.
## Node.js version required
Support Node.js >= `8.0.0`
## Install
```bash
$ npm install agentkeepalive --save
```
## new Agent([options])
* `options` {Object} Set of configurable options to set on the agent.
Can have the following fields:
* `keepAlive` {Boolean} Keep sockets around in a pool to be used by
other requests in the future. Default = `true`.
* `keepAliveMsecs` {Number} When using the keepAlive option, specifies the initial delay
for TCP Keep-Alive packets. Ignored when the keepAlive option is false or undefined. Defaults to 1000.
Default = `1000`. Only relevant if `keepAlive` is set to `true`.
* `freeSocketTimeout`: {Number} Sets the free socket to timeout
after `freeSocketTimeout` milliseconds of inactivity on the free socket.
The default [server-side timeout](https://nodejs.org/api/http.html#serverkeepalivetimeout) is 5000 milliseconds, to [avoid ECONNRESET exceptions](https://medium.com/ssense-tech/reduce-networking-errors-in-nodejs-23b4eb9f2d83), we set the default value to `4000` milliseconds.
Only relevant if `keepAlive` is set to `true`.
* `timeout`: {Number} Sets the working socket to timeout
after `timeout` milliseconds of inactivity on the working socket.
Default is `freeSocketTimeout * 2` so long as that value is greater than or equal to 8 seconds, otherwise the default is 8 seconds.
* `maxSockets` {Number} Maximum number of sockets to allow per
host. Default = `Infinity`.
* `maxFreeSockets` {Number} Maximum number of sockets (per host) to leave open
in a free state. Only relevant if `keepAlive` is set to `true`.
Default = `256`.
* `socketActiveTTL` {Number} Sets the socket active time to live, even if it's in use.
If not set, the behaviour keeps the same (the socket will be released only when free)
Default = `null`.
## Usage
```js
const http = require('http');
const HttpAgent = require('agentkeepalive').HttpAgent;
const keepaliveAgent = new HttpAgent({
maxSockets: 100,
maxFreeSockets: 10,
timeout: 60000, // active socket keepalive for 60 seconds
freeSocketTimeout: 30000, // free socket keepalive for 30 seconds
});
const options = {
host: 'cnodejs.org',
port: 80,
path: '/',
method: 'GET',
agent: keepaliveAgent,
};
const req = http.request(options, res => {
console.log('STATUS: ' + res.statusCode);
console.log('HEADERS: ' + JSON.stringify(res.headers));
res.setEncoding('utf8');
res.on('data', function (chunk) {
console.log('BODY: ' + chunk);
});
});
req.on('error', e => {
console.log('problem with request: ' + e.message);
});
req.end();
setTimeout(() => {
if (keepaliveAgent.statusChanged) {
console.log('[%s] agent status changed: %j', Date(), keepaliveAgent.getCurrentStatus());
}
}, 2000);
```
### `getter agent.statusChanged`
counters have cExcerpt of 11,813 characters
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