HTTP status codes are issued by servers in response to client requests. There are 5 classes of status codes: 1xx for informational responses, 2xx for successful requests, 3xx for redirections, 4xx for client errors, and 5xx for server errors. Common codes include 200 for OK, 301 for moved permanently, 403 for forbidden, 404 for not found, and 500 for internal server error. The 403 and 404 codes are explained in more detail, with 403 occurring when permission is lacking and 404 when the requested page cannot be found. Suggested fixes for 403 include checking file permissions while fixes for 404 involve ensuring the requested URL is correct.

1. Prepared By :- Jangezkhan A.khamo
What Are HTTP
Status Codes ?
University of Duhok
College of Science
Computer Department

2. Contents
• Introduction to http .
• http how it works .
• http status codes .
• 403: Forbidden
• 404: Not Found

3. Introduction to http
• HTTP( Hypertext transfer protocol )
• Language of the Web
 protocol used for communication between web browsers
and web servers .

4. http how it works
As a request-response protocol, HTTP gives users a way to interact with web
resources such as HTML files by transmitting hypertext messages between
clients and servers. HTTP clients generally use Transmission Control Protocol
(TCP) connections to communicate with servers.

5. HTTP Status Codes
• Status codes are issued by a server in response to a client’s request
made to the server.
• All HTTP response status codes are separated into five classes (or categories).
•1xx Informational – the request was received, continuing process
•2xx Successful – the request was successfully received, understood and accepted
•3xx Redirection – further action needs to be taken in order to complete the request
•4xx Client Error – the request contains bad syntax or cannot be fulfilled
•5xx Server Error – the server failed to fulfill an apparently valid request

6. 1xx Informational
• 100 – Continue .
• 101 – Switching protocol .
• 103 – Checkpoints .
• Basically, the server hasn’t fully completed the request yet and it’s
still processing the information. This is like a transitional phase
saying the server has not yet completed the request.

7. 2xx Successful
• Basically, these are the successful requests, showing that everything
happened as planned (which is usually what you’re going for):
• 200 – OK (you will see this one the most);
• 201 – Created;
• 202 – Accepted;
• 205 – Reset Content;
• 206 – Partial Content.

8. 3xx Redirection
• These error codes are shown when you request an address and are sent
somewhere else. There’s a bunch of different types of different types of
redirects:
• 301 – Moved Permanently;
• 302 – Found;
• 304 – Not Modified;
• 305 – Use Proxy;
• 307 – Temporary Redirect.

9. 4xx Client Error
• These are all for client errors. That means the page wasn’t found and so
mething is wrong with the request. Whatever is happening though ,
the issue is typically on the client side:
• 400: Bad Request;
• 401: Unauthorized;
• 403: Forbidden;
• 404: Not Found;
• 408: Request Timeout;
• 410: Gone;
• 429: Too Many Requests.

10. 403: Forbidden
error message
403 Forbidden – you don’t have permission to access on this server’ . And
most likely, you have no idea what it is all about.

11. Fix the 403 forbidden error
In short, follow these steps in order to fix the 403 forbidden error:
1. Check or reset/rename your . htaccess file
2. Reset file and folder permissions
3. Disable WordPress plugins

12. 404: Not Found
• The HTTP error 404 means that the page you are trying to open could
not be found on the server.

13. The error message may appear as follows:
• "Error 404"
• "404 not found"
• "The requested URL was not found on the server."
• "HTTP Error 404"
• "Error 404: page not found"
404: Not Found

14. How to Fix Windows Error 404

15. How to Fix Windows Error 404

16. How to Fix Windows Error 404

17. How to Fix Windows Error 404

18. How to Fix Windows Error 404

19. How to Fix Windows Error 404

20. 5xx Server Error
• These appear when the client made a good request, but the server didn’t
complete it.
• So something is wrong on the server side.
• 500 – Internal Server Error;
• 502 – Bad Gateway;
• 503 – Service Unavailable;
• 504 – Gateway Timeout.

21. Any
Question ?

22. Thanks
For
Attention