Nginx+php-fpm架构，遇到这个错误时：Request Entity Too Large 或 Nginx 413 Request Entity Too Large，需要做如下调整即可。
1、修改配置一：Tune Nignx.conf setting:
# set client body size to 2M under http scope
client_max_body_size 2M;
超时设置：
send_timeout 60;
fastcgi_connect_timeout 300;
fastcgi_send_timeout 300;
fastcgi_read_timeout 300;
2、修改配置二：Tune php.ini settings:
;This sets the maximum amount of memory in bytes that a script is allowed to allocate
memory_limit = 32M
;The maximum size of an uploaded file.
upload_max_filesize = 2M
;Sets max size of post data allowed. This setting also affects file upload. To upload large files, this value must be larger than upload_max_filesize
post_max_size = 3M
3、修改配置三：优化php-fpm配置
php_admin_value[memory_limit] = 1224M
3/28 UPDATE：假设上传1M的文件，如果代码中有对文件进行操作的，如写入，移动等，都php-fpm至少要再分配3倍的空间，如3M。如果是上传10M的文件，则要30M php-fpm内存。
