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vary

Manipulate the HTTP Vary header

  • 1.1.2
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increased by5.02%
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What is vary?

The vary npm package is a utility for manipulating the HTTP Vary header. It allows developers to programmatically append values to the Vary header of an HTTP response, ensuring that the correct header is constructed for proper handling of HTTP caching, content negotiation, and other mechanisms that might vary the response based on certain aspects of the request.

What are vary's main functionalities?

Appending to the Vary header

This feature allows you to append a field to the Vary header of an HTTP response. In the code sample, the 'User-Agent' field is added to the Vary header, indicating that the response may vary based on the 'User-Agent' header of the request.

"use strict";

const http = require('http');
const vary = require('vary');

http.createServer((req, res) => {
  vary(res, 'User-Agent');
  res.end('Response varies based on User-Agent header.');
}).listen(3000);

Appending multiple fields

This feature allows you to append multiple fields to the Vary header at once. In the code sample, both 'User-Agent' and 'Accept-Encoding' are added to the Vary header, indicating that the response may vary based on both of these request headers.

"use strict";

const http = require('http');
const vary = require('vary');

http.createServer((req, res) => {
  vary(res, 'User-Agent, Accept-Encoding');
  res.end('Response varies based on User-Agent and Accept-Encoding headers.');
}).listen(3000);

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Package last updated on 24 Sep 2017

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