What types of server responses do you know?

Server responses are represented by HTTP status codes, divided into 5 classes:

1. 1xx (Informational): Request received, continuing process.
   • 100 Continue
   • 101 Switching Protocols
   • 102 Processing
   • 103 Early Hints
2. 2xx (Successful): Request successfully received, understood, and processed.
   • 200 OK
   • 201 Created
   • 202 Accepted
   • 203 Non-Authoritative Information
   • 204 No Content
   • 205 Reset Content
   • 206 Partial Content
3. 3xx (Redirection): Additional actions are required to complete the request.
   • 300 Multiple Choices
   • 301 Moved Permanently
   • 302 Found (previously "Moved temporarily")
   • 303 See Other
   • 304 Not Modified
   • 307 Temporary Redirect
   • 308 Permanent Redirect
4. 4xx (Client errors): The request contains invalid syntax or cannot be fulfilled.
   • 400 Bad Request
   • 401 Unauthorized
   • 403 Forbidden
   • 404 Not Found
   • 405 Method Not Allowed
   • 408 Request Timeout
   • 409 Conflict
   • 415 Unsupported Media Type
   • 429 Too Many Requests
5. 5xx (Server errors): The server failed to properly process a valid request.
   • 500 Internal Server Error
   • 501 Not Implemented
   • 502 Bad Gateway
   • 503 Service Unavailable
   • 504 Gateway Timeout

Besides the status, the server response includes headers and a body, if applicable. Headers provide meta-information (content type, size, caching, etc.), and the body contains the data itself (HTML page, JSON, XML, etc.).