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docs: Add Caddyfile env var default value (#112)

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Francis Lavoie 2020-11-24 15:46:27 -05:00 • committed by GitHub
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src/docs/markdown/caddyfile/concepts.md
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@ -298,6 +298,12 @@ If your configuration relies on environment variables, you can use them in the C
Environment variables in this form are substituted before parsing begins, so they can expand to empty values, partial tokens, complete tokens, or even multiple tokens and lines. Environment variables in this form are substituted before parsing begins, so they can expand to empty values, partial tokens, complete tokens, or even multiple tokens and lines.
A default value can be specified for when the environment variable is not found, by using `:` as the delimiter between the variable name and the default value:
```caddy
{$DOMAIN:localhost}
```
If you want to defer the substitution of an environment variable until runtime, you can use the [standard `{env.*}` placeholders](/docs/conventions#placeholders). If you want to defer the substitution of an environment variable until runtime, you can use the [standard `{env.*}` placeholders](/docs/conventions#placeholders).