HTTP 416 Range Not Satisfiable vs 501 Not Implemented
HTTP 416 (Range Not Satisfiable) is a 4xx Client Error response, while 501 (Not Implemented) is a 5xx Server Error response. 416 indicates that the server cannot serve the requested byte range. The Range header value is outside the resource's size. In contrast, 501 means that the server does not support the functionality required to fulfill the request. The server either does not recognize the request method or lacks the ability to fulfill it.
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.
Description
The server does not support the functionality required to fulfill the request. The server either does not recognize the request method or lacks the ability to fulfill it.
When You See It
When using an HTTP method (like PATCH) that the server doesn't support.
How to Fix
Use a different HTTP method that the server supports. Check server documentation.
Key Differences
416 is a 4xx Client Error response, while 501 is a 5xx Server Error response.
HTTP 416: The server cannot serve the requested byte range. The Range header value is outside the resource's size.
HTTP 501: The server does not support the functionality required to fulfill the request. The server either does not recognize the request method or lacks the ability to fulfill it.
You encounter 416 when when requesting a byte range beyond the file's actual size.
You encounter 501 when when using an HTTP method (like PATCH) that the server doesn't support.
When to Use Which
For 416 (Range Not Satisfiable): Check the Content-Range in the response for the actual file size and adjust your Range header. For 501 (Not Implemented): Use a different HTTP method that the server supports. Check server documentation.