ALKNETWORK 
1xx: Information (Hang on, we're working on it)
100 – Continue: All good so far, keep sending the rest of your request!
101 – Switching Protocols: Got your upgrade request, switching over to a newer protocol (like HTTP/2) now.
102 – Processing: We got your request and we're working on it, but the answer isn't ready yet.
103 – Early Hints: While the server prepares the full page, here are some early links so your browser can start preloading stuff.
2xx: Success (It worked!)
200 – OK: Everything went smoothly and here is what you asked for:
GET: Here's the file or page you wanted.
HEAD: Here's just the header info, no main content.
PUT/POST: Action complete, here is the result.
TRACE: Echoing back the exact message you sent us.
201 – Created: Success! A brand new item or file was created (like when you upload a file or save a new setting).
202 – Accepted: We received your data, but haven't processed it yet. It's sitting in a queue waiting its turn.
204 – No Content: Everything worked, but there's no actual content to send back to your screen.
206 – Partial Content: Sending you just a piece of the file to save bandwidth and load faster (super handy for streaming).
3xx: Redirection (Go over there instead)
300 – Multiple Choices: There are a few different options for this request; pick one!
301 – Moved Permanently: This page has a new home forever—go to the new URL.
304 – Not Modified: Nothing has changed since you last checked, so just use your saved cache copy.
307 – Temporary Redirect: Head over to this other URL temporarily, but make sure to use the exact same method (like POST) as before.
308 – Permanent Redirect: Moved permanently to a new URL, and you must keep using the exact same request method.
4xx: Client Error (Oops, something went wrong on your end)
400 – Bad Request: The server can't understand what you're asking for because something is messed up in the request.
401 – Unauthorized: You need to log in first before you can view this page.
403 – Forbidden: We know who you are, but you don't have permission to be here!
404 – Not Found: We can't find what you're looking for (or we're hiding it from you for security).
409 – Conflict: Your request clashes with the server's current state (often due to bad load balancer or database links).
5xx: Server Error (Oops, something broke on our end)
500 – Internal Server Error: Something went wrong on the server side and it doesn't know how to handle it.
501 – Not Implemented: The server doesn't support the action you're asking it to do.
502 – Bad Gateway: One server received an invalid response from another server while trying to fulfill your request.
503 – Service Unavailable: The server is temporarily down for maintenance or completely overloaded. Try again later!
504 – Gateway Timeout: The server waited too long for a response from another server and gave up.
