Request Entity too large error in java apache HttpClient - Stack Overflow
https://stackoverflow.com/questions/39829283/request-entity-too-large-error-in-java-apache-httpclient
Apache responding with Request Entity Too Large - Server Fault
https://serverfault.com/questions/256838/apache-responding-with-request-entity-too-large
上传文件报413 Request Entity Too Large错误解决办法 - 简书
https://www.jianshu.com/p/3851c3d6eaf1
post 请求体过大 413 Request Entity Too Large - Elastic 中文社区
https://elasticsearch.cn/question/4357
org.apache.http.client (Apache HttpClient 4.5.12 API)
http://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache/http/client/package-summary.html