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The file is read when parsing the configuration and is updated each time the upstream configuration is changed.Changing the file content directly should be avoided.
If there are several such servers, they are tried in turn using a weighted round-robin balancing method.
and one request to each of the second and third servers.
If an error occurs during communication with a server, the request will be passed to the next server, and so on until all of the functioning servers will be tried.
The first three octets of the client IPv4 address, or the entire IPv6 address, are used as a hashing key.
The method ensures that requests from the same client will always be passed to the same server except when this server is unavailable.