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Allow running periodic updates with enabled HTTP API (#916)

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* Allow running periodic updates with enabled HTTP API

* Add --http-api-periodic-polls to docs
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DasSkelett 2021-04-27 22:18:45 +02:00 • committed by GitHub
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docs/http-api-mode.md
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@ -28,6 +28,8 @@ services:
- 8080:8080
```
By default, enabling this mode prevents periodic polls (i.e. what is specified using `--interval` or `--schedule`). To run periodic updates regardless, pass `--http-api-periodic-polls`.
Notice that there is an environment variable named WATCHTOWER_HTTP_API_TOKEN. To prevent external services from accidentally triggering image updates, all of the requests have to contain a "Token" field, valued as the token defined in WATCHTOWER_HTTP_API_TOKEN, in their headers. In this case, there is a port bind to the host machine, allowing to request localhost:8080 to reach Watchtower. The following `curl` command would trigger an image update:
```bash