telegraf/plugins/inputs/http_response/README.md

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# HTTP Response Input Plugin
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This input plugin checks HTTP/HTTPS connections.
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### Configuration:
```
# HTTP/HTTPS request given an address a method and a timeout
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[[inputs.http_response]]
## Deprecated in 1.12, use 'urls'
## Server address (default http://localhost)
# address = "http://localhost"
## List of urls to query.
# urls = ["http://localhost"]
## Set http_proxy (telegraf uses the system wide proxy settings if it's is not set)
# http_proxy = "http://localhost:8888"
## Set response_timeout (default 5 seconds)
# response_timeout = "5s"
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## HTTP Request Method
# method = "GET"
## Whether to follow redirects from the server (defaults to false)
# follow_redirects = false
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## Optional HTTP Request Body
# body = '''
# {'fake':'data'}
# '''
## Optional substring or regex match in body of the response (case sensitive)
# response_string_match = "\"service_status\": \"up\""
# response_string_match = "ok"
# response_string_match = "\".*_status\".?:.?\"up\""
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## Optional TLS Config
# tls_ca = "/etc/telegraf/ca.pem"
# tls_cert = "/etc/telegraf/cert.pem"
# tls_key = "/etc/telegraf/key.pem"
## Use TLS but skip chain & host verification
# insecure_skip_verify = false
## HTTP Request Headers (all values must be strings)
# [inputs.http_response.headers]
# Host = "github.com"
## Interface to use when dialing an address
# interface = "eth0"
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```
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### Metrics:
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- http_response
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- tags:
- server (target URL)
- method (request method)
- status_code (response status code)
- result ([see below](#result--result_code))
- fields:
- response_time (float, seconds)
- response_string_match (int, 0 = mismatch / body read error, 1 = match)
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- http_response_code (int, response status code)
- result_type (string, deprecated in 1.6: use `result` tag and `result_code` field)
- result_code (int, [see below](#result--result_code))
#### `result` / `result_code`
Upon finishing polling the target server, the plugin registers the result of the operation in the `result` tag, and adds a numeric field called `result_code` corresponding with that tag value.
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This tag is used to expose network and plugin errors. HTTP errors are considered a successful connection.
|Tag value |Corresponding field value|Description|
--------------------------|-------------------------|-----------|
|success | 0 |The HTTP request completed, even if the HTTP code represents an error|
|response_string_mismatch | 1 |The option `response_string_match` was used, and the body of the response didn't match the regex. HTTP errors with content in their body (like 4xx, 5xx) will trigger this error|
|body_read_error | 2 |The option `response_string_match` was used, but the plugin wans't able to read the body of the response. Responses with empty bodies (like 3xx, HEAD, etc) will trigger this error|
|connection_failed | 3 |Catch all for any network error not specifically handled by the plugin|
|timeout | 4 |The plugin timed out while awaiting the HTTP connection to complete|
|dns_error | 5 |There was a DNS error while attempting to connect to the host|
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### Example Output:
```
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http_response,method=GET,server=http://www.github.com,status_code=200,result=success http_response_code=200i,response_time=6.223266528,result_type="success",result_code=0i 1459419354977857955
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```