Introduction

The first-response-time.js script can be used to collect the first response time also known as the time to first request.

The script executes a command and makes requests to a specific URL in 100 ms intervals until it receives the 200 HTTP status code with a response body.

The script finally prints out the duration between the command execution and the time it received the 200 status.

Installation

1. Install Node.js with npm
2. Run npm i -g first-response-time

Usage

first-response-time "<COMMAND>" <URL> [--ping <INTERVAL_MS>]

<COMMAND> a correctly escaped system command. <URL> request url.

(optional) --ping <INTERVAL_MS> (default: 100 milliseconds)

Examples

first-response-time "java -jar uber-jar.jar" http://localhost:8080/hello

first-response-time "node script.js" http://localhost:8080/hello --ping 20