这几天项目总是在凌晨挂机，查看日志发现以下错误：
Http11Processor - Error parsing HTTP request headerNote: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
java.lang.IllegalArgumentException: Invalid character found in method name. HTTP method names must be tokensat org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:426)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:687)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:745)Http11Processor - Error parsing HTTP request headerNote: further occurrences of HTTP header parsing errors will be logged at DEBUG level.
java.lang.IllegalArgumentException: Invalid character found in the HTTP protocolat org.apache.coyote.http11.Http11InputBuffer.parseRequestLine(Http11InputBuffer.java:533)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:687)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:745)那么可能需要通过以下两种方式解决：
一、Tomcat的header缓冲区大小不够,只需要在server.xml中增加maxHttpHeaderSize字段即可:
<Connector URIEncoding="UTF-8" port="8080" protocol="org.apache.coyote.http11.Http11NioProtocol"useBodyEncodingForURI="false"enableLookups="false"connectionTimeout="20000"redirectPort="8443" maxHttpHeaderSize="你想要的大小"/>如果是SpringBoot项目，则需要在application.yml文件中，进行如下修改：
server:port: 项目端口# 下面这个参数是为解决问题而新增的tomcat:max-http-header-size: 8192二、可能是因为请求协议不对，需要统一成https或http请求。
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