HTTP status codes are three-digit numbers that indicate the outcome of an HTTP request made by a client to a server. Here are some of the most commonly used HTTP status codes that software engineers should be familiar with:
1xx (Informational):
100 Continue
101 Switching Protocols
2xx (Success):
200 OK
201 Created
204 No Content
206 Partial Content
3xx (Redirection):
300 Multiple Choices
301 Moved Permanently
302 Found (or Moved Temporarily)
304 Not Modified
307 Temporary Redirect
4xx (Client Errors):
400 Bad Request
401 Unauthorized
403 Forbidden
404 Not Found
405 Method Not Allowed
409 Conflict
410 Gone
429 Too Many Requests
5xx (Server Errors):
500 Internal Server Error
501 Not Implemented
502 Bad Gateway
503 Service Unavailable
504 Gateway Timeout
505 HTTP Version Not Supported
These codes provide information about the result of the client's request and help in troubleshooting issues between clients and servers. It's important for software engineers to understand these codes to diagnose and fix problems in web applications.