Error parsing HTTP request header
Note: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
java.lang.IllegalArgumentException: Request header is too large
请求头超过tomcat的限制。所以要修改tomcat的server.xml
tomcat7之前小于或等于0代表不限制
之后不可设置0，负数为不限制
原文：https://www.cnblogs.com/zhengyuanyuan/p/9044791.html