1xx HTTP codes are only meant for informational purposes, browsers and user agents will not process and show these response codes on the front end screen like other series of response codes.

2xx codes indicate successful responses usually this means the action requested by the client was received, understood and accepted successfully.

A web server sends status codes in the first line of HTTP Response to indicate the status of request received from the client. 3xx status codes are reserved for redirection.

4XX group of HTTP status codes indicates that the request for the resource contains bad syntax or cannot be filled for some other reason, presumably by fault of the client sending the request.

HTTP status codes or Response codes that fall into the 5xx category, specify problems with server.

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Information about 502 Error

Looking here and there to find the cause of the error. Checkout the common Causes and Fixes for 504 Gateway Error.

The 503 Service Unavailable error signifies that your website