invalid url - my config or invalid request? (1 reply)

My site is generally doing exactly what I want. Periodically I'll see
some errors in the log. I'm trying to determine if these indicate
problems in my config, or potential attacks, or simply a broken client.

The last few lines in my log:
2016/10/05 14:38:37 [error] 17912#0: *17824 invalid url, client:
195.154.181.113, server: amfes.com, request: "HEAD /robots.txt HTTP/1.0"
2016/10/05 19:47:27 [error] 17912#0: *18315 invalid url, client:
169.56.71.56, server: amfes.com, request: "GET / HTTP/1.0"
2016/10/08 13:46:21 [error] 17910#0: *27413 invalid url, client:
212.83.162.138, server: amfes.com, request: "HEAD /robots.txt HTTP/1.0"
2016/10/09 18:05:30 [error] 17912#0: *32588 invalid url, client:
211.1.156.90, server: amfes.com, request: "HEAD / HTTP/1.0"

Clients I control have no problem reaching the root or the robots.txt
file - so what is this telling me?

--
Daniel

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