HTTP 101 Switching Protocols vs 416 Range Not Satisfiable
HTTP 101 (Switching Protocols) is a 1xx Informational response, while 416 (Range Not Satisfiable) is a 4xx Client Error response. 101 indicates that the server understands the Upgrade header field request and indicates which protocol it is switching to. In contrast, 416 means that the server cannot serve the requested byte range. The Range header value is outside the resource's size.
Description
The server understands the Upgrade header field request and indicates which protocol it is switching to.
When You See It
When upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
How to Fix
This is normal behavior during protocol upgrades. Ensure your client supports the target protocol.
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
101 is a 1xx Informational response, while 416 is a 4xx Client Error response.
HTTP 101: The server understands the Upgrade header field request and indicates which protocol it is switching to.
HTTP 416: The server cannot serve the requested byte range. The Range header value is outside the resource's size.
You encounter 101 when when upgrading from HTTP/1.1 to WebSocket, or to HTTP/2.
You encounter 416 when when requesting a byte range beyond the file's actual size.
When to Use Which
For 101 (Switching Protocols): This is normal behavior during protocol upgrades. Ensure your client supports the target protocol. For 416 (Range Not Satisfiable): Check the Content-Range in the response for the actual file size and adjust your Range header.