Can anyone knows that meaning of 404 and 502 errors and For what purpose 404 & 502 errors are use?

See http://en.wikipedia.org/wiki/List_of_HTTP_status_codes

404 Not Found
The requested resource could not be found but may be available again in the future.[2] Subsequent requests by the client are permissible.

502 Bad Gateway
The server was acting as a gateway or proxy and received an invalid response from the upstream server.[2]

404 error: The resource pointed by the URL does not exist anymore
502 error: Indicate problems with a proxy server

404 errors indicates that the resource you are currently looking for is unavailable
502 error indicates that the proxy server doesn't receive proper response from the main server.

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 502 Bad Gateway error is an HTTP status code that means that one server on the internet received an invalid response from another server. 502 Bad Gateway errors are completely independent of your particular setup, meaning that you could see one in any browser, on any operating system, and on any device.

404 Error
404 error happened when that particular web page removed or no longer needed.
502 Error
502 Error is bad gateway server error. This error occurred when one web server obtain an invalid response from another web server.

404: Is an error message which is shown by the browser which indicates that the internet address couldn't found.
502: The 502 error is a bad gateway error in which one server on the internet received an invalid response from the other server.

Quote from: harryjames on July 08, 2013, 07:50:30 AM
Can anyone knows that meaning of 404 and 502 errors and For what purpose 404 & 502 errors are use?

Actually a 404 occurs when content can't be found by the web server. A 502 is actual a 'bad gateway server error' where a proxy box can't get any response from the upstream server

Actually a 404 occurs when content can't be found by the web server. A 502 is actual a 'bad gateway server error' where a proxy box can't get any response from the upstream server. ... A 502 is actual a 'bad gateway server error' where a proxy box can't get any response from the upstream server.

404 error or 'page not found' error is a Hypertext Transfer Protocol standard response code that indicates the server was unable to find what was requested.502 Bad Gateway server error response code indicates that the server, while acting as a gateway or proxy, received an invalid response from the upstream server.

502-Bad Gateway
A 404 errors message is a Hypertext transfer Protocol (HTTP) repute code indicating the server couldn't find the asked internet site. In other phrases, your web browser can connect to the server, but the unique page you're looking to get right of entry to can not be reached.