103 Early Hints
Fault: Neither
TL;DR
Allows the server to send preliminary response headers while it prepares the full response.
Used to return some response headers before final HTTP message.
What HTTP 103 Early Hints Means
Used to return some response headers before final HTTP message.
Allows the server to send preliminary response headers while it prepares the full response.
Common Causes
- Server sending Link headers for preloading resources
- Performance optimization
How to Fix It (For Visitors)
- This is not an error - performance optimization in progress
How to Fix It (For Developers/Admins)
- Use to preload critical resources
- Send Link headers for CSS, JS, fonts
Frequently Asked Questions
What does HTTP 103 Early Hints mean?
Allows the server to send preliminary response headers while it prepares the full response. In short: Used to return some response headers before final HTTP message.
How should I handle an HTTP 103 Early Hints response?
Use to preload critical resources. Send Link headers for CSS, JS, fonts.
Official Specification
The 103 Early Hints status code is defined in RFC 8297.