Status Class
1xx Informational
Interim responses that indicate request progress before a final response is sent.
100 Continue
The server received the request headers and the client should proceed to send the body. Learn when and how to use 100 Continue for efficient large uploads.
101 Switching Protocols
The server is switching to a different protocol as requested by the client. Learn about WebSocket upgrades and protocol negotiation.
102 Processing
The server has accepted the request and is processing it, but no response is available yet. Learn about this WebDAV status code for long-running operations.
103 Early Hints
The server sends preliminary response headers to help the client start preloading resources. Learn how 103 Early Hints improves page load performance.
Explore Other Status Classes
2xx Success
Responses indicating the request was accepted and processed successfully.
3xx Redirection
Responses that tell clients to perform additional actions, usually by following a new URL.
4xx Client Error
Client-side request issues such as invalid syntax, missing resources, or permission failures.
5xx Server Error
Server-side failures where the request was valid but the server could not complete it.