1×× Informational

• 100 Continue
• 101 Switching Protocols
• 102 Processing

2×× Success

• 200 OK
• 201 Created
• 202 Accepted
• 203 Non-authoritative Information
• 204 No Content
• 205 Reset Content
• 206 Partial Content
• 207 Multi-Status
• 208 Already Reported
• 226 IM Used

3×× Redirection

• 300 Multiple Choices
• 301 Moved Permanently
• 302 Found
• 303 See Other