Apache

RequestHeader unset Accept-Encoding
ExtFilterDefine fixtext mode=output intype=text/html cmd="/bin/sed.exe s/原字符1/目标字符1/g"  
ExtFilterDefine fixtext1 mode=output intype=text/html cmd="/bin/sed.exe s/原字符2/目标字符2/g"  
SetOutputFilter fixtext;fixtext1
Nginx
sub_filter '原字符' '目标字符';
sub_filter_once off;
proxy_set_header Accept-Encoding "";