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vary

Manipulate the HTTP Vary header

Installation

This is aNode.js module available through thenpm registry. Installation is done using thenpm install command:

$ npm install vary

API

varvary=require('vary')

vary(res, field)

Adds the given headerfield to theVary response header ofres.This can be a string of a single field, a string of a validVaryheader, or an array of multiple fields.

This will append the header if not already listed, otherwise leavesit listed in the current location.

// Append "Origin" to the Vary header of the responsevary(res,'Origin')

vary.append(header, field)

Adds the given headerfield to theVary response header stringheader.This can be a string of a single field, a string of a validVary header,or an array of multiple fields.

This will append the header if not already listed, otherwise leavesit 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')

Examples

Updating the Vary header when content is based on it

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')})