what is 502 Error...?

The 502 Bad Gateway error is an HTTP status code that means that one server received an invalid response from another server.

The Bad Gateway error can be customized by each website. While fairly uncommon, different web servers do describe this error differently. Here are some common ways you might see it.
 
This problem is due to poor IP communication between back-end computers, possibly including the Web server at the site you are trying to visit. Before analysing this problem, you should clear your browser cache completely.
 
The 502 Bad Gateway error is an HTTP status code that means that one server received an invalid response from another server.
 
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