> ## Documentation Index
> Fetch the complete documentation index at: https://docs.still200.com/llms.txt
> Use this file to discover all available pages before exploring further.

# HTTP monitoring

> Let Still200 poll your service and its dependencies.

An HTTP monitor periodically requests a public health endpoint. Still200 records availability and response time, classifies dependency health, and opens an incident after repeated failures.

## Simple response

The smallest valid endpoint returns a service name with HTTP `200`:

```json theme={null}
{
  "service_name": "billing-api"
}
```

## Dependency-aware response

Add a `checks` object to report latency or an error for each dependency:

```json theme={null}
{
  "service_name": "billing-api",
  "checks": {
    "postgres": { "latency_ms": 42.7 },
    "redis": { "latency_ms": 3.1 }
  }
}
```

Still200 derives each check's status. An error is `unhealthy`, latency above 1,000 ms is `degraded`, and other results are `healthy`.

<CardGroup cols={2}>
  <Card title="Health-check specification" icon="list-check" href="/http-monitoring/health-check-spec">
    Review every request and response requirement.
  </Card>

  <Card title="Implementation examples" icon="code" href="/http-monitoring/examples">
    Build a dependency-aware endpoint.
  </Card>
</CardGroup>