可能的原因
1、请求的URL过长,改为POST
2、POST数据过大,修改php.ini参数:post_max_size = 20M,upload_max_filesize = 20M
3、返回的数据过大,修改httpd.conf:
SetOutputFilter PHP
SetInputFilter PHP
LimitXMLRequestBody
20971520
LimitRequestBody 20971520
【原】apache 413 错误 Request Entity Too Large,布布扣,bubuko.com
【原】apache 413 错误 Request Entity Too Large
原文:http://www.cnblogs.com/longhua828/p/apache-request-entity-too-large.html