◆Error Codes Wiki

HTTP 103 Early Hints — Preload Resources

Informational1xx informational

Overview

HTTP 103 Early Hints lets the server send preload hints before the final response, improving page load speed.

Key Details

  • Status: 103 Early Hints
  • Category: 1xx Informational
  • Sends Link headers before final response
  • Allows browser to preload resources early

Common Causes

  • Server uses Early Hints for performance optimization
  • Preloads CSS, JS, fonts before HTML is ready
  • Reduces perceived page load time
  • Supported by Chrome, Edge, and other modern browsers

Steps

  1. 1Configure server to send 103 responses
  2. 2Add Link headers for critical resources
  3. 3Test with Chrome DevTools Network tab
  4. 4Measure performance improvement with Lighthouse

Tags

http-status1xx-informationalhttp-103httpstatus-code

More in 1xx Informational

http-100-continueHTTP 100 Continue — What It Means & How to Fix It
Informational
http-101-switching-protocolsHTTP 101 Switching Protocols — What It Means & How to Fix It
Informational
http-102-processingHTTP 102 Processing — What It Means & How to Fix It
Informational
http-103-early-hintsHTTP 103 Early Hints — What It Means & How to Fix It
Informational
http-100HTTP 100 Continue — What It Means
Informational
http-101HTTP 101 Switching Protocols Explained
Informational

Frequently Asked Questions

Indirectly — faster page loads improve Core Web Vitals.