vary

Manipulate the HTTP Vary header

This is a Node.js module available through the npm registry. Installation is done using the npm install command:

$ npm install vary

varvary=require('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.

// Append "Origin" to the Vary header of the responsevary(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"vary.append('Accept, User-Agent','Origin')

varhttp=require('http')varvary=require('vary')http.createServer(functiononRequest(req,res){// about to user-agent sniffvary(res,'User-Agent')varua=req.headers['user-agent']||''varisMobile=/mobi|android|touch|mini/i.test(ua)// serve site, depending on isMobileres.setHeader('Content-Type','text/html')res.end('You are (probably) '+(isMobile ? '' : 'not ')+'a mobile user')})

$ npm test

MIT