# A strange log

**URL:** <https://www.ruby-forum.com/t/a-strange-log/244580>\
**Category:** NGINX\
**Created:** [May 6, 2016, 3:11pm UTC](https://www.ruby-forum.com/t/a-strange-log/244580 "2016-05-06T15:11:03Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rafa\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/958977/32.png) [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\
**Post date:** [May 6, 2016, 3:11pm UTC](https://www.ruby-forum.com/t/a-strange-log/244580/1 "2016-05-06T15:11:03Z")

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Hi,  
I have a strange log from 169.229.3.91 (University of California at  
Berkeley ISTDATA (NET-169-229-0-0-2) 169.229.0.0 - 169.229.255.255).  
[06/May/2016:13:03:10 +0200] … 5\xF5\x13\xED\xCA  
upstream\_response\_time - msec 1462532590.541 request\_time 0.150  
Is it usual to use command char in header ?  
Is this an exploit or something else ?  
Best regards  
Christophe