nginx 因POST请求体内容过大导致500，设置 client_max_body_size，client_body_buffer_size

设置 client_max_body_size 和 client_body_buffer_size

    client_max_body_size 2000M;
    client_body_buffer_size 2000M;

client_max_body_size
client_max_body_size 默认 1M，表示 客户端请求服务器最大允许大小，在“Content-Length”请求头中指定。如果请求的正文数据大于client_max_body_size，HTTP协议会报错 413 Request Entity Too Large。就是说如果请求的正文大于client_max_body_size，一定是失败的。如果需要上传大文件，一定要修改该值。

client_body_buffer_size
Nginx分配给请求数据的Buffer大小，如果请求的数据小于client_body_buffer_size直接将数据先在内存中存储。如果请求的值大于client_body_buffer_size小于client_max_body_size，就会将数据先存储到临时文件中

test 案例

#user  nobody;
worker_processes  1;


#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

# pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    sendfile        on;
    keepalive_timeout  65;
    proxy_buffering off;

    #gzip  on;
    map $http_upgrade $connection_upgrade {
        default upgrade;
        '' close;
    }

    server {
        listen       8043 ssl;
        server_name  127.0.0.1;
        
        ssl_certificate /usr/local/etc/nginx/server.crt;
        ssl_certificate_key  /usr/local/etc/nginx/server.key;

	    client_max_body_size 2000M;
        client_body_buffer_size 2000M;
        location / {
            proxy_pass   http://127.0.0.1:8000;
        }

        location /aaaa {
            proxy_pass   http://xxx.xxx.xx.xx;
            proxy_read_timeout 3600s;
            proxy_send_timeout 3600s;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }

    include servers/*;
}

参考：https://blog.youkuaiyun.com/feifeixiang2835/article/details/84964036