Nginx POST log printing data

At work, the development of want to get data from Nginx POST log, first recorded

In the end of the log format plus $ request_body configuration information

log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for" $request_body';

Add to print the log in server operation
access_log  logs/access.log  main;　　

I thought the problem solved, the development required by adding data on the server response is returned in the log

The current nginx does not support the use of the output response packet body body_filter_by_luato the allocation request message body to a nginxvariable. The following is an example of

1: Download and install LuaJIT

# 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
 
Appears following successful compilation representation
OK        Successfully built LuaJIT
make[1]: Leaving directory `/usr/local/src/LuaJIT-2.0.2/src'
==== Successfully built LuaJIT 2.0.2 ====
 
# make install
The following appears to indicate a successful installation
==== Successfully installed LuaJIT 2.0.2 to /usr/local ====

2: Download ready nginx lua module　

wget https://github.com/chaoslawful/lua-nginx-module/archive/v0.8.6.tar.gz
Tar -xzvf Lua nginx module-0.8.6.tar.gz
MV Lua nginx module 0.8.6 /usr/local/src/lua-nginx-module-0.8.6

3: Install nginx

nginx-tar zxf 1.16.1.tar.gz
cd nginx-1.16.1
// first import environment variable that tells where to find nginx luajit
export LUAJIT_LIB=/usr/local/lib
export LUAJIT_INC=/usr/local/include/luajit-2.0

./configure --prefix=/usr/local/nginx --add-module=/usr/local/src/lua-nginx-module-0.8.6 --with-http_ssl_module --with-http_stub_status_module --with-pcre

make j2
make install　　

　Common error handling:

/usr/local/nginx-1.4.2/sbin/nginx -v
./objs/nginx: error while loading shared libraries: libluajit-5.1.so.2: cannot open shared object file: No such file or directory
Solution:
# ln -s /usr/local/lib/libluajit-5.1.so.2 /lib64/libluajit-5.1.so.2

4: Configure Nginx

nginx configuration file by adding the following configuration:

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

5: Access test

curl http://127.0.0.1/test
hello, ttlsa lua // test using curl, return the data indicate a successful installation

6: Nginx log configuration

log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for" $request_body  resp_body:"$resp_body"';　　

Added in the appropriate configuration server:

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
';　　

The following examples:

server {
        listen         443  ssl;
        server_name  xxxx.com;

        # ssl  on;
        ssl_certificate /usr/local/nginx/conf/keys/public.pem;
        ssl_certificate_key  /usr/local/nginx/conf/keys/private.key;
        ssl_session_cache    shared:SSL:1m;
        ssl_session_timeout  5m;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
        ssl_ciphers ECDH: AESGCM: HIGH:! RC4:! DH:! MD5:! 3DES:! Anull:! eNULL;
        ssl_prefer_server_ciphers  on;

        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://127.0.0.1:8080;
            proxy_redirect off ;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header REMOTE-HOST $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header User-Agent $http_user_agent;
            proxy_set_header Referer $http_referer;
            client_max_body_size 50m;
            client_body_buffer_size 256k;
            proxy_connect_timeout 300;
            proxy_send_timeout 300;
            proxy_read_timeout 300;
            proxy_next_upstream error timeout invalid_header http_500 http_503 http_404;
            proxy_max_temp_file_size 128m;
            proxy_buffer_size 512k;
            proxy_buffers    16 512k;
            proxy_busy_buffers_size 512k;
            proxy_temp_file_write_size 512k;
        }
    access_log /tmp/faceauth.log main;

    }　　

 Start Nginx, print the log, you can see the relevant data.