It's one of the logged by nginx webserver requests:




Can someone understand what this is?

Thanks ;)

2 Answers 2


It may look like someone is fuzzing your webserver. Can you by any chance include more information than the strings you've pasted? It can look like someone is trying to pass you binary data.

There seems to be a pattern in some of it. For example \x may indicate hexadecimal annotation. You can see that both strings start and end with x11 and x1F. This might be of interest.

You also see an equal sign in there which may indicate the assigning of a GET value. Also the ampersand sign (&) which is used to concatenate several GET parameters.

Hopefully someone has a good explanation for us.

  • Yea i'm thinking the same. :)
    – Somebody
    Jun 3, 2011 at 20:45

It seems encoding related. The second part seems to be octal-encoded with 'failsafe' guesswork done. How did you obtain the second part? A larger log chunk would help more.

  • Ugh... sorry. I was trying to fix some nginx log parser and it was crashing once in a while. Then i have decided to look into the problem and found those impossible to parse log strings.
    – Somebody
    Jun 3, 2011 at 20:44

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