502 (bad gateway) causes and Solutions

A term is used to explain

502 yes Error type bad gateway Wrong gateway .

The reasons causing

Connection timeout We send... To the server request , Because the server has too many links , The server can't respond normally , There is such an error

resolvent

Refresh from server （ctrl + F5）： Is to send the request to the server again , Download data on the server .
Basic refresh （F5）： Maybe it's just retrieving data from the local hard disk to the browser , It is not necessary to re send the request to the server .

Refresh In fact, from The server Download data to Local memory or hard disk buffer in , Then read the data from the local memory or hard disk to the browser to show us .

Possible causes

1. DNS buffer .
2. opened agent
3. DNS Hijacked