Steps to reproduce:

1. Create an item with type HTTP agent
2. Paste JSON request body into 'Request body' section
3. Change a value in the body to a user macro
4. Monitor response

Result:

The result I get from the endpoint when I use a macro is blank or '{}', suggesting that the JSON data posted is valid, but the "url" value is incorrect and does not match any records in Google Safe Browsing API.

If I change my '{$URL}' macro within the JSON body to the exact text I put in my user macro, it works and the responseI get is a match from Google Safe Browsing API.

I'll include a screenshot of both the JSON body including the macro, as well as a screenshot of the straight text.

I'll also include a screenshot of latest data, which shows where I change it to use the straight text URL and it begins to work.

Expected:
I expect the macro to send the url in place of the macro unformatted and result in a match.

I've tried:

Finding logs within the Google Safe Browsing URL that show what the request body contains, but I don't think this is possible.

I've also tried finding logs of what Zabbix is actually sending, but couldn't find any way to do this either after a lot of searching.

I've tried sending as 'Raw data' as well as 'JSON data' within the item config.

If there is a way to debug this within Zabbix itself, I'd love to get some more info on what it's actually sending in place of the macro placeholder.