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# HTTP Endpoints


<img src="https://netdata.cloud/img/globe.svg" width="150"/>


Plugin: go.d.plugin
Module: httpcheck

<img src="https://img.shields.io/badge/maintained%20by-Netdata-%2300ab44" />

## Overview

This collector monitors HTTP servers availability and response time.




This collector is supported on all platforms.

This collector supports collecting metrics from multiple instances of this integration, including remote instances.


### Default Behavior

#### Auto-Detection

This integration doesn't support auto-detection.

#### Limits

The default configuration for this integration does not impose any limits on data collection.

#### Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.


## Metrics

Metrics grouped by *scope*.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.



### Per target

The metrics refer to the monitored target.

Labels:

| Label      | Description     |
|:-----------|:----------------|
| url | url value that is set in the configuration file. |

Metrics:

| Metric | Dimensions | Unit |
|:------|:----------|:----|
| httpcheck.response_time | time | ms |
| httpcheck.response_length | length | characters |
| httpcheck.status | success, timeout, redirect, no_connection, bad_content, bad_header, bad_status | boolean |
| httpcheck.in_state | time | boolean |



## Alerts

There are no alerts configured by default for this integration.


## Setup

### Prerequisites

No action required.

### Configuration

#### File

The configuration file name for this integration is `go.d/httpcheck.conf`.


You can edit the configuration file using the `edit-config` script from the
Netdata [config directory](/docs/netdata-agent/configuration/README.md#the-netdata-config-directory).

```bash
cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/httpcheck.conf
```
#### Options

The following options can be defined globally: update_every, autodetection_retry.


<details open><summary>Config options</summary>

| Name | Description | Default | Required |
|:----|:-----------|:-------|:--------:|
| update_every | Data collection frequency. | 5 | no |
| autodetection_retry | Recheck interval in seconds. Zero means no recheck will be scheduled. | 0 | no |
| url | Server URL. |  | yes |
| status_accepted | HTTP accepted response statuses. Anything else will result in 'bad status' in the status chart. | [200] | no |
| response_match | If the status code is accepted, the content of the response will be matched against this regular expression. |  | no |
| headers_match | This option defines a set of rules that check for specific key-value pairs in the HTTP headers of the response. | [] | no |
| headers_match.exclude | This option determines whether the rule should check for the presence of the specified key-value pair or the absence of it. | no | no |
| headers_match.key | The exact name of the HTTP header to check for. |  | yes |
| headers_match.value | The [pattern](https://github.com/netdata/netdata/tree/master/src/go/collectors/go.d.plugin/pkg/matcher#supported-format) to match against the value of the specified header. |  | no |
| cookie_file | Path to cookie file. See [cookie file format](https://everything.curl.dev/http/cookies/fileformat). |  | no |
| timeout | HTTP request timeout. | 1 | no |
| username | Username for basic HTTP authentication. |  | no |
| password | Password for basic HTTP authentication. |  | no |
| proxy_url | Proxy URL. |  | no |
| proxy_username | Username for proxy basic HTTP authentication. |  | no |
| proxy_password | Password for proxy basic HTTP authentication. |  | no |
| method | HTTP request method. | GET | no |
| body | HTTP request body. |  | no |
| headers | HTTP request headers. |  | no |
| not_follow_redirects | Redirect handling policy. Controls whether the client follows redirects. | no | no |
| tls_skip_verify | Server certificate chain and hostname validation policy. Controls whether the client performs this check. | no | no |
| tls_ca | Certification authority that the client uses when verifying the server's certificates. |  | no |
| tls_cert | Client TLS certificate. |  | no |
| tls_key | Client TLS key. |  | no |

</details>

#### Examples

##### Basic

A basic example configuration.

<details open><summary>Config</summary>

```yaml
jobs:
  - name: local
    url: http://127.0.0.1:8080

```
</details>

##### With HTTP request headers

Configuration with HTTP request headers that will be sent by the client.

<details open><summary>Config</summary>

```yaml
jobs:
  - name: local
    url: http://127.0.0.1:8080
    headers:
      Host: localhost:8080
      User-Agent: netdata/go.d.plugin
      Accept: */*

```
</details>

##### With `status_accepted`

A basic example configuration with non-default status_accepted.

<details open><summary>Config</summary>

```yaml
jobs:
  - name: local
    url: http://127.0.0.1:8080
    status_accepted:
      - 200
      - 204

```
</details>

##### With `header_match`

Example configurations with `header_match`. See the value [pattern](https://github.com/netdata/netdata/tree/master/src/go/collectors/go.d.plugin/pkg/matcher#supported-format) syntax.

<details open><summary>Config</summary>

```yaml
jobs:
    # The "X-Robots-Tag" header must be present in the HTTP response header,
    # but the value of the header does not matter.
    # This config checks for the presence of the header regardless of its value.
  - name: local
    url: http://127.0.0.1:8080
    header_match:
      - key: X-Robots-Tag

    # The "X-Robots-Tag" header must be present in the HTTP response header
    # only if its value is equal to "noindex, nofollow".
    # This config checks both the presence of the header and its value.
  - name: local
    url: http://127.0.0.1:8080
    header_match:
      - key: X-Robots-Tag
        value: '= noindex,nofollow'

    # The "X-Robots-Tag" header must not be present in the HTTP response header
    # but the value of the header does not matter.
    # This config checks for the presence of the header regardless of its value.
  - name: local
    url: http://127.0.0.1:8080
    header_match:
      - key: X-Robots-Tag
        exclude: yes

    # The "X-Robots-Tag" header must not be present in the HTTP response header
    # only if its value is equal to "noindex, nofollow".
    # This config checks both the presence of the header and its value.
  - name: local
    url: http://127.0.0.1:8080
    header_match:
      - key: X-Robots-Tag
        exclude: yes
        value: '= noindex,nofollow'

```
</details>

##### HTTP authentication

Basic HTTP authentication.

<details open><summary>Config</summary>

```yaml
jobs:
  - name: local
    url: http://127.0.0.1:8080
    username: username
    password: password

```
</details>

##### HTTPS with self-signed certificate

Do not validate server certificate chain and hostname.


<details open><summary>Config</summary>

```yaml
jobs:
  - name: local
    url: https://127.0.0.1:8080
    tls_skip_verify: yes

```
</details>

##### Multi-instance

> **Note**: When you define multiple jobs, their names must be unique.

Collecting metrics from local and remote instances.


<details open><summary>Config</summary>

```yaml
jobs:
  - name: local
    url: http://127.0.0.1:8080

  - name: remote
    url: http://192.0.2.1:8080

```
</details>



## Troubleshooting

### Debug Mode

To troubleshoot issues with the `httpcheck` collector, run the `go.d.plugin` with the debug option enabled. The output
should give you clues as to why the collector isn't working.

- Navigate to the `plugins.d` directory, usually at `/usr/libexec/netdata/plugins.d/`. If that's not the case on
  your system, open `netdata.conf` and look for the `plugins` setting under `[directories]`.

  ```bash
  cd /usr/libexec/netdata/plugins.d/
  ```

- Switch to the `netdata` user.

  ```bash
  sudo -u netdata -s
  ```

- Run the `go.d.plugin` to debug the collector:

  ```bash
  ./go.d.plugin -d -m httpcheck
  ```


