Multi-Status

Conveys information about multiple resources, used in WebDAV.

207 Multi-Status is a WebDAV response that bundles results for several resources into one XML body, each with its own status code. A bulk delete might report 204 for most files and a failure for a locked one, all in a single reply. Unless you work with WebDAV or something built on it, like CalDAV calendar servers, you won't run into it.

What 207 looks like on the wire

PROPFIND /dav/projects/ HTTP/1.1
Host: dav.example.com
Depth: 1

HTTP/1.1 207 Multi-Status
Content-Type: application/xml; charset=utf-8

About 2xx Success

The request was received, understood, and accepted. This is what you want to see.

Where it's defined

207 Multi-Status is defined in RFC 4918 §11.1. MDN's 207 reference covers browser behavior and examples.