nginx日志中添加请求的response日志（推荐）

# cd /usr/local/src
# wget http://luajit.org/download/LuaJIT-2.0.2.tar.gz
# tar -xzvf LuaJIT-2.0.2.tar.gz
# cd LuaJIT-2.0.2
# make

OK  Successfully built LuaJIT
make[1]: Leaving directory `/usr/local/src/LuaJIT-2.0.2/src'
==== Successfully built LuaJIT 2.0.2 ====
# make install

# cd /usr/local/src
# wget https://github.com/chaoslawful/lua-nginx-module/archive/v0.8.6.tar.gz
# tar -xzvf v0.8.6

# cd /usr/local/src/
# wget http://nginx.org/download/nginx-1.4.2.tar.gz
# tar -xzvf nginx-1.4.2.tar.gz
# cd nginx-1.4.2
//先导入环境变量,告诉nginx去哪里找luajit
# export LUAJIT_LIB=/usr/local/lib
# export LUAJIT_INC=/usr/local/include/luajit-2.0
# ./configure --prefix=/usr/local/nginx-1.4.2 --add-module=../lua-nginx-module-0.8.6
# make -j2
# make install

# cd /usr/local/nginx-1.4.2/conf/
# vi nginx.conf

location /hello {
   default_type 'text/plain';
   content_by_lua 'ngx.say("hello, lua")';
  }

# cd /usr/local/nginx-1.4.2/sbin
# ./nginx

http {
 log_format mylog 'response_body:$resp_body';

 server {
  #记录nginx请求返回值
  lua_need_request_body on;
  set $resp_body "";
  body_filter_by_lua '
   local resp_body = string.sub(ngx.arg[1], 1, 1000)
   ngx.ctx.buffered = (ngx.ctx.buffered or "") .. resp_body
   if ngx.arg[2] then
    ngx.var.resp_body = ngx.ctx.buffered
   end
  ';
　　　　 
  location / {
   proxy_pass http://127.0.0.1:5000;
   access_log /var/log/nginx/access.log mylog;
   }
 }
}

  body_filter_by_lua '
   local resp_body = string.sub(ngx.arg[1], 1, 1000)
   ngx.ctx.buffered = (ngx.ctx.buffered or "") .. resp_body
   if ngx.arg[2] then
    ngx.var.resp_body = ngx.ctx.buffered
   end
  ';

str1='''
{\x22code\x22: 404, \x22message\x22: \x22\xE8\xAF\xB7\xE6\xB1\x82\xE7\x9A\x84\xE8\xB5\x84\xE6\xBA\x90\xE4\xB8\x8D\xE5\xAD\x98\xE5\x9C\xA8\x22, \x22data\x22: {}}
'''
print(str1.encode('raw_unicode_escape').decode('utf-8'))