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Update nginx.conf

Update config_server.json

Delete example_config_server.json

Rename example_config_server to example_config_server.json

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Create example_nginx

Rename example_config_server_ to example_config_server

Rename 2.config_server_example to example_config_server_

Create 2.config_server_example

Update config_client.json

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Update config_client.json

Update README.md

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