HEAD Request Error Log

Dear BPS,

Greetings.

I’ve been getting a similar error log (as below) for the past few days, is this from a theme/plugin?

BPS SECURITY LOG
=================
=================

[BEGIN Total # of Security Log Entries by Type:]
Total 403 GET Request Log Entries: 1
Total 405 HEAD Request Log Entries: 524
[END Total # of Security Log Entries by Type:]

[405 HEAD Request: October 5, 2021 - 3:13 am]
BPS: 5.2
WP: 5.8.1
Event Code: BFHS-HEAD - HEAD Request Blocked
Solution: https://forum.ait-pro.com/forums/topic/security-log-event-codes/
REMOTE_ADDR: ***
Host Name: ***
SERVER_PROTOCOL: HTTP/1.1
HTTP_CLIENT_IP: 
HTTP_FORWARDED: 
HTTP_X_FORWARDED_FOR: ***
HTTP_X_CLUSTER_CLIENT_IP: 
REQUEST_METHOD: HEAD
HTTP_REFERER: 
REQUEST_URI: *** [image url]
QUERY_STRING: 
HTTP_USER_AGENT: Java/1.8.0_181