PRTG provides versatile monitoring, from Server health to application API. today we will  use powershell to monitor the API health.

 

Below are the configurations in the PRTG sensor:

• Host IP: 10.34.50.56
• URL: https:///stationery.webapi/Account/LogOn’
• Postdata: {‘username’: ‘xxxx‘,’password’:’xxxx‘,’merchantNumber’:xxxx}
• Content Type: Custom
• Custom content type: application/json

insert the Host IP after the second slash in the URL , you find the complet url: https://10.34.50.56/stationery.webapi/Account/LogOn

To find out the “Response Must Include” area, run bellow powershell command (Postdata is used in the body area):

##below ignore the ssl cert trust isue:

add-type @"

    using System.Net;

    using System.Security.Cryptography.X509Certificates;

    public class TrustAllCertsPolicy : ICertificatePolicy {

        public bool CheckValidationResult(

            ServicePoint srvPoint, X509Certificate certificate,

            WebRequest request, int certificateProblem) {

            return true;

        }

    }

"@

[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy

## below pass the JSON data to the url, and get the response.

invoke-webrequest -Uri 'https://10.34.50.56/stationery.webapi/Account/LogOn' -Method Post -ContentType "application/json" -Body "{'username': 'xxxx','password':'xxxx','merchantID':xxxx}"

 

I found some code like:

Content: {"data":{"user":{"countrycode":0, "Reload":31, "rolename":"Stationery Shop","username":xxxx,........

AllElements:

....

RawContent : HTTP/1.1 200 OK

             Pragma: no-cache,no-cache

             Content-Length:1195
{"data":{"user":{"countrycode":0, "Reload":31, "rolename":"Stationery Shop","username":xxxx,........
"merchantID":"1234567890123"

now I change the password to a wrong one on purpose,which is 12345, and try to get some other response just for comparison purpose:

invoke-webrequest -Uri 'https://10.34.50.56/stationery.webapi/Account/LogOn' -Method Post -ContentType "application/json" -Body "{'username': 'xxxx','password':'12345','merchantID':xxxx}"

now the response become:

Server Error

We're sorry, but an unexpected error occurred on the server. .....

So I will just pick a piece of data, such as merchantID from the first response and use it as the evidence of working API.

Response Must Include: 1234567890123