A strange log

I have a strange log from (University of California at
Berkeley ISTDATA (NET-169-229-0-0-2) -
[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

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