HTTP 103 Early Hints — What It Means & How to Fix It

The HTTP 103 Early Hints status code allows the server to send preliminary response headers before the final response, enabling the browser to start preloading resources. 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: This status code lets the server hint at resources the browser should preload while the final response is being prepared.. It improves page load performance by allowing early resource fetching.. Commonly used with Link headers to specify resources like stylesheets or scripts.. Supported by modern browsers like Chrome and Firefox.. The final response follows with the actual status code and body.. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Server wants to speed up page loads by hinting at critical resources early.. CDN or reverse proxy sends early hints while the origin server prepares the response.. Performance optimization for pages with known critical resources.. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Configure your server or CDN to send 103 Early Hints with Link headers for critical resources.. Identify key resources like CSS, fonts, and JavaScript that benefit from preloading.. Test browser support and verify resources are being preloaded correctly.. Monitor performance improvements using browser developer tools.. 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.