// REFERENCE

102 Processing

Class: 1xx

A provisional WebDAV response: the server received the request and is still processing it, so the client doesn't time out. In modern HTTP it's usually replaced by 103.

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Request builder

100
100 Continue 101
101 Switching Protocols 103
103 Early Hints

Semantics per RFC 9110 and the IANA status code registry. Educational content.