What Is Error Of 404 & 503 ?

404:
404 or not found error message is generated by the website hosting server when a user attempts to follow a broken or dead link. In other words, this error code indicates that the client (user) was able to communicate with the server but the server could not find what was requested.

503:
503 or service unavailable error occurs when the server is currently unavailable because it is overloaded or down for maintenance. Generally, this is a temporary state.
 
A 404 error is an HTTP status code that means that the page you were trying to reach on a website couldn't be found on their server. The 404 Not Found error might appear for several reasons even though no real issue exists, so sometimes a simple refresh will often load the page you were looking for. The most common method is to retry the web page by pressing F5, clicking the refresh/reload button, or trying the URL from the address bar again.

The 503 Service Unavailable error is an HTTP status code that means the web site's server is simply not available right now.
 
404 Error: Not Found
The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.
If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.

503 Error: Services Unavailable
The server is currently unable to handle the request due to a temporary overloading or maintenance of the server. The implication is that this is a temporary condition which will be alleviated after some delay. If known, the length of the delay may be indicated in a Retry-After header. If no Retry-After is given, the client SHOULD handle the response as it would for a 500 response.
Note: The existence of the 503 status code does not imply that a server must use it when becoming overloaded. Some servers may wish to simply refuse the connection.
 
404:
404 or not found error message is generated by the website hosting server when a user attempts to follow a broken or dead link. In other words, this error code indicates that the client (user) was able to communicate with the server but the server could not find what was requested.

503:
503 or service unavailable error occurs when the server is currently unavailable because it is overloaded or down for maintenance. Generally, this is a temporary state.
 
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