HTTP 102 Processing vs 412 Precondition Failed
HTTP 102 (Processing) is a 1xx Informational response, while 412 (Precondition Failed) 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, 412 means that one or more conditions in the request headers (If-Match, If-Unmodified-Since) evaluated to false.
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
One or more conditions in the request headers (If-Match, If-Unmodified-Since) evaluated to false.
When You See It
When using conditional requests with ETags and the resource has changed.
How to Fix
Refresh the ETag/Last-Modified value and retry with updated preconditions.
Key Differences
102 is a 1xx Informational response, while 412 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 412: One or more conditions in the request headers (If-Match, If-Unmodified-Since) evaluated to false.
You encounter 102 when during long-running WebDAV operations.
You encounter 412 when when using conditional requests with ETags and the resource has changed.
When to Use Which
For 102 (Processing): Wait for the final response. This is an interim status to prevent timeouts. For 412 (Precondition Failed): Refresh the ETag/Last-Modified value and retry with updated preconditions.