Apache Benchmark test load with gzip compression

ab_gzip.sh

ab -c 10 -n 1000 -H "Accept-Encoding: gzip,deflate" http://www.example.com/

It is not working if nginx does not have option - gzip_http_version 1.0;

I use these settings on nginx and haven't had to specify gzip_http_version

##
# Gzip Settings
##

gzip on;
gzip_disable "msie6";

# when proxy if backend returned a gzip encoded for a client that would not support it
# makes sense if we want varnish to store compressed content
gunzip on;

# add the vary accept header
gzip_vary on;
gzip_proxied any;
gzip_comp_level 7;
gzip_buffers 16 8k;
gzip_types text/plain text/css application/json text/xml application/xml application/xml+rss text/javascript application/javascript application/x-javascript;