demo · v141

Purpose Header

Pick a prefetch trigger and watch what Chrome 141 actually sends versus what it sent before. Then paste your server's branch logic — the analyser tells you whether dropping the legacy Purpose: prefetch header will break your routing.

before Chrome 141


      

      

        
after Chrome 141

        

      

    


    
No evaluation yet.

  


  

    
migration cheat-sheet


// OLD (still works through 140):
if (req.headers["purpose"] === "prefetch") { /* serve cached / skip analytics */ }

// NEW (works in all versions, future-proof):
const sp = req.headers["sec-purpose"] || "";
if (sp.includes("prefetch") || sp.includes("prerender")) {
  // serve cached / skip analytics
}

  


  

    
see also