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HTTP Endpoints

HTTP Endpoints

Plugin: go.d.plugin Module: httpcheck

Overview

This collector monitors HTTP servers availability status and response time.

Possible statuses:

Status Description
success HTTP request completed successfully with a status code matching the configured status_accepted range (default: 200), and the response body and headers (if configured) match expectations.
timeout HTTP request timed out before receiving a response (default: 1 second).
no_connection Failed to establish a connection to the target.
redirect Received a redirect response (3xx status code) while not_follow_redirects is configured.
bad_status HTTP request completed with a status code outside the configured status_accepted range (default: non-200).
bad_content HTTP request completed successfully but the response body does not match the expected content (when using response_match).
bad_header HTTP request completed successfully but response headers do not match the expected values (when using headers_match).

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.

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.

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.

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 to match against the value of the specified header. no
cookie_file Path to cookie file. See cookie file format. 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

Examples

Basic

A basic example configuration.

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

With HTTP request headers

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

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

With status_accepted

A basic example configuration with non-default status_accepted.

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

With header_match

Example configurations with header_match. See the value pattern syntax.

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'

HTTP authentication

Basic HTTP authentication.

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

HTTPS with self-signed certificate

Do not validate server certificate chain and hostname.

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

Multi-instance

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

Collecting metrics from local and remote instances.

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

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

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.

Troubleshooting

Debug Mode

Important: Debug mode is not supported for data collection jobs created via the UI using the Dyncfg feature.

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].

    cd /usr/libexec/netdata/plugins.d/
    
  • Switch to the netdata user.

    sudo -u netdata -s
    
  • Run the go.d.plugin to debug the collector:

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

Getting Logs

If you’re encountering problems with the httpcheck collector, follow these steps to retrieve logs and identify potential issues:

  • Run the command specific to your system (systemd, non-systemd, or Docker container).
  • Examine the output for any warnings or error messages that might indicate issues. These messages should provide clues about the root cause of the problem.

System with systemd

Use the following command to view logs generated since the last Netdata service restart:

journalctl _SYSTEMD_INVOCATION_ID="$(systemctl show --value --property=InvocationID netdata)" --namespace=netdata --grep httpcheck

System without systemd

Locate the collector log file, typically at /var/log/netdata/collector.log, and use grep to filter for collector’s name:

grep httpcheck /var/log/netdata/collector.log

Note: This method shows logs from all restarts. Focus on the latest entries for troubleshooting current issues.

Docker Container

If your Netdata runs in a Docker container named “netdata” (replace if different), use this command:

docker logs netdata 2>&1 | grep httpcheck

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