Latency Headers Benchmark

Latency headers benchmark makes use of these HTTP headers from latency header enabled server responses:

• x-request-received is set by the server with the timestamp of when the request was received
• x-response-sent is set by the server with the timestamp of when the response was sent

To determine the following latency benchmarks:

• outgoing network latency: time between client sending the request and server receiving it
• server processing latency: time between server receiving the request and sending the response
• incoming network latency: time between server sending the response and client receiving it
• total round trip latency: time between client sending the request and receiving response

Usage

latencyHeadersBenchmark(requestSent, headers)

• requestSent integer - Timestamp in milliseconds since epoch of when the request was sent
• headers object - With required response headers x-request-received and x-response-sent

Example

// Require http for the request
var http = require('http')

// Require latency-headers-benchmark 
var latencyBenchmark = require('latency-headers-benchmark')

// Save the timestamp of when the request was sent as its required
var requestSent = new Date().getTime()

// Send the request to a server that returns the latency headers
http.get("http://localhost:1337", function(res) {

  // Run the benchmark
  var results = latencyBenchmark(requestSent, res.headers)

  // Output the results
  console.log(results)

})

Try it out

An example server and app is included in this repo for your convenience.

# Clone this repo
git clone [email protected]:montanaflynn/latency-header-benchmark.git

# CD to the example dir
cd latency-header-benchmark/example

# Install this package (npmception?)
npm install

# Start the server in the background
node server.js &

# Run the app
node app.js

# Kill the example server
pkill latencyServer

Related projects

• Latency Header Proof of Concept
• Express Latency Header Middleware
• Koa Latency Header Middleware

MIT license

Copyright (c) 2014, Montana Flynn (http://anonfunction.com/)