# HTTP

[Open dashboard](https://my.tuna.am/monitors)

The HTTP monitor checks availability of websites and APIs by sending HTTP requests from multiple geographic regions.

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## How it works

1. The system sends an HTTP request to the specified URL from the selected regions
2. You can configure the method and check the response code, headers and body
3. If the conditions are not met — a notification is sent

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## Parameters

### Description

| Parameter       | Description                   | Required |
| --------------- | ----------------------------- | -------- |
| **Name**        | Unique monitor name           | Yes      |
| **Description** | A note about the task purpose | No       |

![screenshot with monitor description](/docs/img/monitors/description.png)

### Details

| Parameter            | Description                       | Default    |
| -------------------- | --------------------------------- | ---------- |
| **Method**           | HTTP request method               | GET        |
| **URL**              | URL of the resource being checked | -          |
| **Headers**          | Additional HTTP headers           | —          |
| **Timeout**          | Maximum response wait time        | 10 seconds |
| **Retries**          | Number of retries on error        | 3          |
| **Follow redirects** | Whether to follow redirects (3xx) | Yes        |

**Supported methods:**

* GET
* POST
* PUT
* PATCH
* DELETE
* HEAD
* OPTIONS
* TRACE

![screenshot with details of the HTTP monitor](/docs/img/monitors/details_http.png)

### Checks

The HTTP monitor supports various response checks:

![screenshot with check parameters of the HTTP monitor](/docs/img/monitors/check_http.png)

### Regions

Choose one or more regions for the check. The monitor will send requests from each selected region at the specified interval.

| Parameter    | Description     | Default   |
| ------------ | --------------- | --------- |
| **Interval** | Check frequency | 5 minutes |

![screenshot with monitor region](/docs/img/monitors/region.png)

### Notifications

Here you can specify contact groups for notifications. If left unspecified, the user's email is used.

You can also set a waiting period — **Grace Period**. It is added to the expected time of the next signal. For example, if the interval is 5 minutes and the Grace Period is 2 minutes, the alert will be sent 7 minutes after the last signal. Repeated notifications remind you of the problem; you can set the interval and number of these reminders.

![screenshot with monitor job details](/docs/img/monitors/notify.png)

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## SSL/TLS and Whois monitoring

The HTTP monitor automatically checks SSL certificates for HTTPS URLs and shows information about them, as well as the domain registrar and the expiration date.

![screenshot with the SSL certificate of the HTTP monitor](/docs/img/monitors/tls.png)