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Chproxy removes all the query params from input requests (except the user’s params and listed here) before proxying them to ClickHouse nodes. This prevents from unsafe overriding of various ClickHouse settings.

Be careful when configuring limits, allowed networks, passwords etc. By default chproxy tries detecting the most obvious configuration errors such as allowed_networks: [""] or sending passwords via unencrypted HTTP.

Special option hack_me_please: true may be used for disabling all the security-related checks during config validation (if you are feeling lucky :) ).

For sensitive configuration options, such as user passwords, chproxy supports loading configuration from environment variables. In order to load a configuration variable from a environment variable, a placeholder needs to be put in it’s place in the configuration file. Placeholder are of the form ${ENV_VAR_NAME}. As an example, to load a user password from the environment variable MY_PASSWORD you can use a placeholder as in the following snippet:

- name: "default"
password: ${MY_PASSWORD}

This will be replaced by the actual environment variable once the configuration is (re)loaded from disk. If the environment variable isn’t found the placeholder will remain and won’t be replaced.