Understanding apache.error.log message?

Hi,

My apache.error.log is listing lots of messages.

I’d really like to:

• understand what they mean
• if I should be concerned
• and what (if anything) I can do to fix them?

Here’s some examples:

Example 1 What does AH01071: Got error 'Primary script unknown\n' mean? I guess the referer means this traffic came from a google search? Is that right?

[Wed Mar 07 10:25:13.091724 2018] [proxy_fcgi:error] [pid 23250:tid 139792931026688] [client 34.211.170.204:32229] AH01071: Got error 'Primary script unknown\n', referer: https://google.com

Example 2 Same as Example 1, but there’s no referer. This error is mentioned again: AH01071: Got error 'Primary script unknown\n'

[Wed Mar 07 10:25:41.486181 2018] [proxy_fcgi:error] [pid 23251:tid 139793179039488] [client 106.161.134.188:32235] AH01071: Got error 'Primary script unknown\n'

Example 3 Same AH01071: Got error 'Primary script unknown\n' referer is http://d3creative.uk/wp-login.php. This looks like someone is trying to visit that page (that domain doesn’t use WordPress).

[Wed Mar 07 10:45:26.724938 2018] [proxy_fcgi:error] [pid 23503:tid 139793162254080] [client 201.17.159.95:32443] AH01071: Got error 'Primary script unknown\n', referer: http://d3creative.uk/wp-login.php

Can these errors be fixed? If so, can anyone tell me how?

Thanks for reading Stephen