Unable to test XPath Preprocessing

[sdi-david]

I have been trying to create some items using XPath after reading this blog post: https://blog.zabbix.com/zabbix-xpath...ocessing/7936/

I created the HTTP agent item and it pulls in the XML data. I then started working a Dependent item and when I attempt to test the preprocessing, I get this error:

cannot extract XML value with xpath "count(/server/devices/device/field)": cannot parse xml value

I assumed I was making a mistake because I am not familiar with XPath so I continued researching and testing for another hour or so before I accidentally saved the item and noticed it was working.

I installed Zabbix 5.0 on CentOS 8 from the Zabbix repo, is this an issue with my install or an issue with Zabbix itself?

[sdi-david]

I realized the issue is that test doesn't appear to pull the actual data, but lets you populate the data. If I put the xml data into the first value field in the test dialog it works. So the problem was how I thought test works. My bad!