HTTP 103 Early Hints vs 308 Permanent Redirect
HTTP 103 (Early Hints) is a 1xx Informational response, while 308 (Permanent Redirect) is a 3xx Redirection 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, 308 means that the resource has been permanently moved. Like 301, but guarantees the HTTP method will NOT be changed.
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 resource has been permanently moved. Like 301, but guarantees the HTTP method will NOT be changed.
When You See It
For permanent URL changes where POST requests must remain POST.
How to Fix
Update all references to the new URL. The HTTP method is preserved.
Key Differences
103 is a 1xx Informational response, while 308 is a 3xx Redirection 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 308: The resource has been permanently moved. Like 301, but guarantees the HTTP method will NOT be changed.
You encounter 103 when when a server wants the browser to start loading CSS/JS before the full response is ready.
You encounter 308 when for permanent URL changes where POST requests must remain POST.
When to Use Which
For 103 (Early Hints): No fix needed. This optimization helps speed up page loading. For 308 (Permanent Redirect): Update all references to the new URL. The HTTP method is preserved.