HTTP 102 Processing vs 426 Upgrade Required
HTTP 102 (Processing) is a 1xx Informational response, while 426 (Upgrade Required) is a 4xx Client Error response. 102 indicates that the server has received and is processing the request, but no response is available yet. Prevents the client from timing out. In contrast, 426 means that the server refuses to perform the request using the current protocol but might after the client upgrades to a different protocol.
Description
The server has received and is processing the request, but no response is available yet. Prevents the client from timing out.
When You See It
During long-running WebDAV operations.
How to Fix
Wait for the final response. This is an interim status to prevent timeouts.
Description
The server refuses to perform the request using the current protocol but might after the client upgrades to a different protocol.
When You See It
When a server requires HTTPS or a newer protocol version.
How to Fix
Switch to the protocol specified in the Upgrade response header.
Key Differences
102 is a 1xx Informational response, while 426 is a 4xx Client Error response.
HTTP 102: The server has received and is processing the request, but no response is available yet. Prevents the client from timing out.
HTTP 426: The server refuses to perform the request using the current protocol but might after the client upgrades to a different protocol.
You encounter 102 when during long-running WebDAV operations.
You encounter 426 when when a server requires HTTPS or a newer protocol version.
When to Use Which
For 102 (Processing): Wait for the final response. This is an interim status to prevent timeouts. For 426 (Upgrade Required): Switch to the protocol specified in the Upgrade response header.