Наблюдаю строки вот такого вида в access.log
339870507.703 0 192.168.0.159 NONE/400 4236 M▒▒▒▒c(▒▒▒_▒▒▒▒;▒z`i0Y▒▒▒▒▒2▒▒▒8=ܼ▒▒▒▒rQ▒▒xs=x▒c] %E7%99%98%EFE%C6%B1%C8%A6%99;lO%F7+6d%C0%C7%0E%5E%08%86V%81%F1%7C%9BU%BC%FA%91%1B%3E%18%B8%B8r%CA%FA9%84 - NONE/- text/html