HTTP 103 Early Hints vs 203 Non-Authoritative Information
HTTP 103 (Early Hints) is a 1xx Informational response, while 203 (Non-Authoritative Information) is a 2xx Success response. 103 indicates that used to return some response headers before the final HTTP message. Allows the browser to start preloading resources while the server prepares the response. In contrast, 203 means that the response payload has been modified by a transforming proxy from the origin server's 200 response.
Description
Used to return some response headers before the final HTTP message. Allows the browser to start preloading resources while the server prepares the response.
When You See It
When a server wants the browser to start loading CSS/JS before the full response is ready.
How to Fix
No fix needed. This optimization helps speed up page loading.
Description
The response payload has been modified by a transforming proxy from the origin server's 200 response.
When You See It
When a proxy or CDN modifies the response body (e.g., adds headers, transforms content).
How to Fix
Check if a proxy is modifying the response. Access the origin directly if you need the original content.
Key Differences
103 is a 1xx Informational response, while 203 is a 2xx Success response.
HTTP 103: Used to return some response headers before the final HTTP message. Allows the browser to start preloading resources while the server prepares the response.
HTTP 203: The response payload has been modified by a transforming proxy from the origin server's 200 response.
You encounter 103 when when a server wants the browser to start loading CSS/JS before the full response is ready.
You encounter 203 when when a proxy or CDN modifies the response body (e.g., adds headers, transforms content).
When to Use Which
For 103 (Early Hints): No fix needed. This optimization helps speed up page loading. For 203 (Non-Authoritative Information): Check if a proxy is modifying the response. Access the origin directly if you need the original content.