3xx Redirection Status Codes
These status codes indicate that further action needs to be taken by the user agent to fulfill the request.
TL;DR
3xx codes mean redirection. The client must take additional action to complete the request.
Complete List of 3xx Status Codes
300
Multiple Choices
The request has multiple possible responses to choose from.
301
Moved Permanently
Resource permanently moved
302
Found
Resource temporarily at different URI
303
See Other
See other URI with GET
304
Not Modified
Resource not modified, use cache
305
Use Proxy
Deprecated: access the resource via the specified proxy.
307
Temporary Redirect
Temporary redirect, keep method
308
Permanent Redirect
Permanent redirect, keep method