invalid url - my config or invalid request?

[Valentin V. Bartenev]

On Monday 10 October 2016 10:19:55 Daniel Miller wrote:
> 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?
> 

The official nginx build cannot produce such messages.  They likely come
from 3rd-party module or patches you're using.

  wbr, Valentin V. Bartenev