HTTP 103 Early Hints — Preload Resources

HTTP 103 Early Hints lets the server send preload hints before the final response, improving page load speed. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Status: 103 Early Hints. Category: 1xx Informational. Sends Link headers before final response. Allows browser to preload resources early. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: 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. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Configure server to send 103 responses. Add Link headers for critical resources. Test with Chrome DevTools Network tab. Measure performance improvement with Lighthouse. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our HTTP Status Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.