How to Solve HTTP Errors 401, 403, 404, 500, 503 Brief and Reason for the Errors

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CLICK ON youtube.com/watch?v=ukn59P4-9Fk HTTP Error 401 Unauthorized
HTTP status 403 Forbidden
HTTP status 404 Not Found
HTTP 500 Internal server Error
HTTP 503 Service unavailable

http error 401
Access is denied due to invalid credentials. This behavior occurs if the following conditions are true: The Web site that you try to view uses Integrated Windows authentication. The application pool for the Web site recycles during the authentication process.The user name or password is incorrect. Verify that CAPS LOCK is not on.then retype the current user name and password.

403
Forbidden: You don't have permission to access on this server. The 403 error is essentially saying "Go away and don't come back here.

404
Technically, an Error 404 is a client-side error, implying that the error is your mistake, either because you typed the URL incorrectly or the page has been removed from the website and you should have known.

500
Obtain an IP address from the IP name of the site. This lookup is provided by domain name servers (DNSs).Receive an HTTP data stream back from the Web server in response. Parse this data stream for status codes and other useful information.

503
The Web server running the Web site is currently unable to handle the HTTP request due to a temporary overloading or maintenance of the server. Some servers in this state may also simply refuse the socket connection, in which case a different error may be generated because the socket creation timed out.