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API: Parse html result after sensor creation and Invoke-WebRequest not working



Hi Actually this question is related to every web query giving back an html page A silly question from a dumb powersheller ;) I'm using Powershell 4.0 Here is my query:

[System.Net.ServicePointManager]::ServerCertificateValidationCallback = {$true}
$url = "https://myprtg.domain.tld/api/duplicateobject.htm?id=61222&name=9998 FIX: Uptime&targetid=63040&username=me&password=pass"

When I do:

$result = Invoke-WebRequest  $url

I have an error (since the beginning for all my functions):

Invoke-WebRequest : The underlying connection was closed: An unexpected error occurred on a send.
At line:1 char:11
+ $result = Invoke-WebRequest  $url
+           ~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-WebRequest], WebException
    + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeWebRequestCommand

I used to make it like this instead:

$wc = New-Object System.Net.WebClient
$url = "https://myprtg.domain.tld/api/duplicateobject.htm?id=61222&name=9998 FIX: Uptime&targetid=63040&username=me&password=pass"
$result = $wc.DownloadString($url)
$html = New-Object -ComObject "HTMLFile"
$html.forms | % innerhtml

This last line gives back the whole form but I can't figure out how to get the new sensor id only Do you have any suggestion? Thank you upfront

api html parse parsing-data

Created on Apr 26, 2018 12:59:42 PM

Last change on Apr 26, 2018 8:32:19 PM by  Felix Saure [Paessler Support]

3 Replies



Finally I found out a mean to make it without a com object from the result string I do:

$ResultId = ($Result | where {$_ -like "*sensor*"} | Select-Object -first 1) -replace ".*sensor.htm.id=(\d+)`".*",'$1'

$ResultId contains the sensor's ID

Still I am wondering why Invoke-Webrequest doesn't work

Created on Apr 27, 2018 8:48:10 AM

Last change on Apr 27, 2018 9:11:04 AM by  Luciano Lingnau [Paessler]



Hi there,

Please note that the URL might not be valid at all due to the space in between:

https://myprtg.domain.tld/api/duplicateobject.htm?id=61222&name=9998 FIX: Uptime&targetid=63040&username=me&password=pass

Please try the following URL instead:


Does that work properly?

Best regards.

Created on Apr 27, 2018 10:29:42 AM by  Dariusz Gorka [Paessler Support]



Actually with my method it does work as is I already have though (and tested) removing spaces with invoke-webrequest but it does not work either Actually I have something working and I keep it

Created on Apr 27, 2018 10:39:17 AM

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