HTTP 103 Early Hints vs 416 Range Not Satisfiable
HTTP 103 (Early Hints) is a 1xx Informational response, while 416 (Range Not Satisfiable) is a 4xx Client Error 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, 416 means that the server cannot serve the requested byte range. The Range header value is outside the resource's size.
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 server cannot serve the requested byte range. The Range header value is outside the resource's size.
When You See It
When requesting a byte range beyond the file's actual size.
How to Fix
Check the Content-Range in the response for the actual file size and adjust your Range header.
Key Differences
103 is a 1xx Informational response, while 416 is a 4xx Client Error 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 416: The server cannot serve the requested byte range. The Range header value is outside the resource's size.
You encounter 103 when when a server wants the browser to start loading CSS/JS before the full response is ready.
You encounter 416 when when requesting a byte range beyond the file's actual size.
When to Use Which
For 103 (Early Hints): No fix needed. This optimization helps speed up page loading. For 416 (Range Not Satisfiable): Check the Content-Range in the response for the actual file size and adjust your Range header.