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Add documentation for json schema usage to validate config in the FAQ

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Co-authored-by: Kevin Pollet <pollet.kevin@gmail.com>
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Romain 2022-09-16 09:54:09 +02:00 committed by GitHub
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docs/content/getting-started/faq.md
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@ -157,3 +157,27 @@ By default, the following headers are automatically added when proxying requests
For more details, For more details,
please check out the [forwarded header](../routing/entrypoints.md#forwarded-headers) documentation. please check out the [forwarded header](../routing/entrypoints.md#forwarded-headers) documentation.
## What does the "field not found" error mean?
```shell
error: field not found, node: -badField-
```
The "field not found" error occurs, when an unknown property is encountered in the dynamic or static configuration.
One easy way to check whether a configuration file is well-formed, is to validate it with:
- [JSON Schema of the static configuration](https://json.schemastore.org/traefik-v2.json)
- [JSON Schema of the dynamic configuration](https://json.schemastore.org/traefik-v2-file-provider.json)
## Why are some resources (routers, middlewares, services...) not created/applied?
As a common tip, if a resource is dropped/not created by Traefik after the dynamic configuration was evaluated,
one should look for an error in the logs.
If found, the error obviously confirms that something went wrong while creating the resource,
and the message should help in figuring out the mistake(s) in the configuration, and how to fix it.
When using the file provider,
one easy way to check if the dynamic configuration is well-formed is to validate it with the [JSON Schema of the dynamic configuration](https://json.schemastore.org/traefik-v2-file-provider.json).