varyrewrite in TypeScript with ESM and CommonJS targets
Manipulate the HTTP Vary header
pnpm i @tinyhttp/vary
import { vary, append } from '@tinyhttp/vary'
Adds the given header field to the Vary response header of res.
This can be a string of a single field, a string of a valid Vary
header, or an array of multiple fields.
This will append the header if not already listed, otherwise leaves it listed in the current location.
vary(res, 'Origin')
Adds the given header field to the Vary response header string header.
This can be a string of a single field, a string of a valid Vary header,
or an array of multiple fields.
This will append the header if not already listed, otherwise leaves it listed in the current location. The new header string is returned.
// Get header string appending "Origin" to "Accept, User-Agent" append('Accept, User-Agent', 'Origin')
import { createServer } from 'node:http' import { vary } from '@tinyhttp/vary' createServer((req, res) => { // about to user-agent sniff vary(res, 'User-Agent') const ua = req.headers['user-agent'] || '' const isMobile = /mobi|android|touch|mini/i.test(ua) // serve site, depending on isMobile res.setHeader('Content-Type', 'text/html') res.end('You are (probably) ' + (isMobile ? '' : 'not ') + 'a mobile user') })
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