1. 文档
在nginx中想利用$request_body命令获取post请求的body参数,并落日志,但是发现该变量值为空,查看官网中对$request_body的描述如下:
$request_body request body The variable’s value is made available in locations processed by the proxy_pass, fastcgi_pass, uwsgi_pass, and scgi_pass directives when the request body was read to a memory buffer. 意思是只有location中用到proxy_pass,fastcgi_pass,scgi_pass命令时,该变量才有值。
2.使用proxy_pass,fastcgi_pass, scgi_pass等命令获取$request_body值
试了下用proxy_pass,的确可以。配置如下:
代码语言:javascript复制log_format main_post '$remote_addrt$remote_usert[$time_local]t"$request"t$statust$bytes_sentt'
'"$http_referer"t"$http_user_agent"t"$http_x_forwarded_for"t"$request_body"';
代码语言:javascript复制worker_processes 1; #nginx worker 数量
error_log logs/error.log; #指定错误日志文件路径
events {
worker_connections 1024;
}
http {
log_format dm ' "$request_body" ';
upstream bk_servers_2 {
server 127.0.0.1:6699;
}
server {
listen 6699;
location /post/ {
proxy_pass http://bk_servers_2/api/log/letv/env;
access_log /home/shuhao/openresty-test/logs/post.log dm;
}
location /api/log/letv/env {
return 202;
}
}
}
使用curl命令模拟post请求
代码语言:javascript复制curl -i -d "arg1=1&arg2=2" "http://127.0.0.1:6699/post/"
日志用打印出结果:
代码语言:javascript复制 "arg1=1&arg2=2"
3.使用lua获取$request_body值
条件:使用openresty或者nginx编译了lua模块。
方法:
server中使用lua_need_request_body on; 或者在location lua代码块中使用 ngx.req.read_body()
注意:
1)lua代码块中必须有执行语句,否则lua不执行,无法获取request_body;
2)不要使用return 200;等命令,有return命令,lua代码不执行。
代码语言:javascript复制worker_processes 4; #nginx worker 数量
error_log ~/openresty-test/logs/error.log debug; #指定错误日志文件路径
events {
worker_connections 1024;
}
http {
log_format dm '"$request_body"';
lua_need_request_body on;
server {
listen 6699;
location /post/ {
content_by_lua '
ngx.say("-------")
ngx.req.read_body()
';
access_log ~/openresty-test/logs/post.log dm;
#return 200;
}
}
}
4. 自定义变量存放request body
方法:
1)在server 块中使用set $resp_body ""; 声明变量;
2)在location使用 ngx.var.resp_body = ngx.req.get_body_data() or "-" 为变量赋值
代码语言:javascript复制worker_processes 1; #nginx worker 数量
error_log /home/shuhao/openresty-test/logs/error.log debug; #指定错误日志文件路径
events {
worker_connections 1024;
}
http {
log_format dm ' "$request_body" -- "$resp_body"';
lua_need_request_body on;
server {
listen 6699;
set $resp_body "";
location /post/ {
lua_need_request_body on;
content_by_lua '
local resp_body = ngx.req.get_body_data() or "-"
ngx.var.resp_body = resp_body
';
access_log /home/shuhao/openresty-test/logs/post.log dm;
#return 200;
}
}
}
效果:
(完)