Add clarification about plural env vars (#252)
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				|  | @ -126,12 +126,14 @@ Multiple upstreams can either be configured by supplying a comma separated list | ||||||
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| Every command line argument can be specified as an environment variable by | Every command line argument can be specified as an environment variable by | ||||||
| prefixing it with `OAUTH2_PROXY_`, capitalising it, and replacing hypens (`-`) | prefixing it with `OAUTH2_PROXY_`, capitalising it, and replacing hypens (`-`) | ||||||
| with underscores (`_`). This is particularly useful for storing secrets outside | with underscores (`_`). If the argument can be specified multiple times, the | ||||||
| of a configuration file or the command line. | environment variable should be plural (trailing `S`). | ||||||
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| For example, the `--cookie-secret` flag becomes `OAUTH2_PROXY_COOKIE_SECRET` and | This is particularly useful for storing secrets outside of a configuration file | ||||||
| the `--set-authorization-header` flag becomes `OAUTH2_PROXY_SET_AUTHORIZATION_HEADER`. | or the command line. | ||||||
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|  | For example, the `--cookie-secret` flag becomes `OAUTH2_PROXY_COOKIE_SECRET`, | ||||||
|  | and the `--email-domain` flag becomes `OAUTH2_PROXY_EMAIL_DOMAINS`. | ||||||
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| ## Logging Configuration | ## Logging Configuration | ||||||
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