HTTP

This check performs queries on HTTP endpoints, and HTTP Namespaces to monitor their activity.

http-check.yaml

apiVersion: canaries.flanksource.com/v1
kind: Canary
metadata:
  name: http-check
spec:
  interval: 30
  http:
    - name: http pass response 200 status code
      endpoint: https://httpbin.demo.aws.flanksource.com/status/200
      thresholdMillis: 3000
      responseCodes: [201, 200, 301]
      maxSSLExpiry: 7

Field	Description	Scheme	Required
url		string	Yes
endpoint	Deprecated, Use url instread	string
method	HTTP Request method, default to GET	string
headers	Header fields to be used in the query	[]EnvVar
body	Request Body Contents	string
templateBody	If true the body field will be templated using go templates these variables will be available	boo;
responseCodes	Expected response codes for the HTTP Request.	[]int
responseContent	Exact response content expected to be returned by the endpoint.	string
thresholdMillis	Maximum duration in milliseconds for the HTTP request. It will fail the check if it takes longer.	int
maxSSLExpiry	Maximum number of days until the SSL Certificate expires.	int
name	Name of the check, must be unique within the canary	string	Yes
description	Description for the check	string
icon	Icon for overwriting default icon on the dashboard	string
labels	Labels for check	map[string]string
test	Evaluate whether a check is healthy	Expression
display	Expression to change the formatting of the display	Expression
transform	Transform data from a check into multiple individual checks	Expression
metrics	Metrics to export from	[]Metrics
Connection
connection	Path of existing connection e.g. connection://http/instance Mutually exclusive with username, password	Connection
username	Mutually exclusive with connection	EnvVar
password	Mutually exclusive with connection	EnvVar
url	HTTP URL, if a URL is specified on both the connection and check, the url on the check takes precedence.	string	Yes
ntlm	When true will do authentication using NTLM v1 protocol	bool
ntlmv2	When true will do authentication using NTLM v2 protocol	bool

Result Variables

Result variables can be used in test, display and transform expressions

Name	Description	Scheme
code	HTTP response code	int
headers	HTTP response headers	map[string]string
elapsed	HTTP Request duration	time.Duration
sslAge	Time until SSL certificate expires	time.Duration
content	HTTP Response body	string
json	If Content-Type=application/json response body converted into JSON object	JSON

The above canary (http-check.yaml) is functionally equivalent to http-check-expr.yaml below

http-check-expr.yaml

apiVersion: canaries.flanksource.com/v1
kind: Canary
metadata:
  name: http-check-expr
spec:
  interval: 30
  http:
    - name: http pass response 200 status code
      endpoint: https://httpbin.demo.aws.flanksource.com/status/200
      test:
        expr: "code in [200,201,301] and sslAge > Duration('7d')"

Template Body Variables

Name	Scheme
metadata.name	string
metadata.metadata.namespace	string
metadata.labels	map[string]string
{fields from []env}	any

Variables defined in env will be available to template with the name that's configured on the spec. Eg: In the following spec, the vars my_secret_path and my_secret_var, defined in env, are available during templating.

http-check.yaml

apiVersion: canaries.flanksource.com/v1
kind: Canary
metadata:
  name: http-check
spec:
  interval: 30
  http:
    - name: http pass response 200 status code
      endpoint: https://example.com/{{.my_secret_path}}
      body: |
        {
          "secret": {{.my_secret_var}}
        }
      env:
        - name: my_secret_var
          valueFrom:
            secretKeyRef:
              name: the-secret
              key: key
        - name: my_secret_path
          value: secret_path

See Escaping variables

Metrics

HTTP Check Metrics
canary_check_http_response_status{status, statusClass, url}	Counter	Response code counter for each endpoint
canary_check_http_ssl_expiry{url}	Guage

Status class is one of 1xx, 2xx, 3xx, 4xx, 5xx