http-timer

Timings for HTTP requests

Inspired by the request package.

Installation

NPM:

npm install @szmarczak/http-timer

Yarn:

yarn add @szmarczak/http-timer

Usage

Note:

• The measured events resemble Node.js events, not the kernel ones.
• Sending a chunk greater than highWaterMark will result in invalid upload and response timings. You can avoid this by splitting the payload into smaller chunks.

import https from 'https';
import timer from '@szmarczak/http-timer';

const request = https.get('https://httpbin.org/anything');
timer(request);

request.once('response', response => {
	response.resume();
	response.once('end', () => {
		console.log(response.timings); // You can use `request.timings` as well
	});
});

// {
//   start: 1572712180361,
//   socket: 1572712180362,
//   lookup: 1572712180415,
//   connect: 1572712180571,
//   upload: 1572712180884,
//   response: 1572712181037,
//   end: 1572712181039,
//   error: undefined,
//   abort: undefined,
//   phases: {
//     wait: 1,
//     dns: 53,
//     tcp: 156,
//     request: 313,
//     firstByte: 153,
//     download: 2,
//     total: 678
//   }
// }

API

timer(request)

Returns: Object

Note: The time is a number representing the milliseconds elapsed since the UNIX epoch.

• start - Time when the request started.
• socket - Time when a socket was assigned to the request.
• lookup - Time when the DNS lookup finished.
• connect - Time when the socket successfully connected.
• secureConnect - Time when the socket securely connected.
• upload - Time when the request finished uploading.
• response - Time when the request fired response event.
• end - Time when the response fired end event.
• error - Time when the request fired error event.
• abort - Time when the request fired abort event.
• phases
  • wait - timings.socket - timings.start
  • dns - timings.lookup - timings.socket
  • tcp - timings.connect - timings.lookup
  • tls - timings.secureConnect - timings.connect
  • request - timings.upload - (timings.secureConnect || timings.connect)
  • firstByte - timings.response - timings.upload
  • download - timings.end - timings.response
  • total - (timings.end || timings.error || timings.abort) - timings.start

If something has not been measured yet, it will be undefined.

License

MIT