HTTP status code 102 “Processing” is an informational status code indicating that the server has received the client’s request and is currently processing it, but has not yet completed the operation. This status code can be used to prevent the client from timing out and assuming that the request has been lost. It is commonly utilized in scenarios where the server needs to process requests for an extended period, such as during complex operations in the WebDAV (Web Distributed Authoring and Versioning) protocol.
It is important to note that status code 102 “Processing” is no longer recommended for use and has been removed in some of the latest versions of WebDAV. Modern web servers typically do not return this status code, and browsers and other clients may ignore it. If the server anticipates that a request will take a long time to complete, it may use other status codes, such as 200 OK, and include progress information in the response body, or employ other mechanisms to prevent client timeouts.