1xx Informational
Use 102 as an interim WebDAV response when processing is underway and the final status is not ready yet.
COPY /archive/ to /backup/102 Processing followed later by 207 Multi-StatusThe server acknowledges progress while it prepares the final detailed outcome.
The server is saying, 'I checked the start of your request. It looks okay so far, so go ahead and send the big part now.'
The server is saying, 'Let's keep talking, but switch to a different protocol for the rest of this connection.'
The server is giving the browser a head start: 'You’ll probably need these files, so start getting them while I finish the real response.'