问题场景
项目运行过程中，部分链接访问会报错，报错提示如下：
org.springframework.http.InvalidMediaTypeException: Invalid mime type "application/xhtml＋xml": Invalid token character '＋' in token "xhtml＋xml"
at org.springframework.http.MediaType.parseMediaType(MediaType.java:534)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
at org.springframework.http.MediaType.parseMediaTypes(MediaType.java:556)
at org.springframework.boot.autoconfigure.web.servlet.WelcomePageHandlerMapping.getAcceptedMediaTypes(WelcomePageHandlerMapping.java:93)
at org.springframework.boot.autoconfigure.web.servlet.WelcomePageHandlerMapping.getHandlerInternal(WelcomePageHandlerMapping.java:82)
at org.springframework.web.servlet.handler.AbstractHandlerMapping.getHandler(AbstractHandlerMapping.java:401)
at org.springframework.web.servlet.DispatcherServlet.getHandler(DispatcherServlet.java:1231)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1014)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.orm.hibernate5.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:155)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at com.common.filter.PermissionFilter.doFilter(PermissionFilter.java:74)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at pub.servlet.CsrfFilter.doFilter(CsrfFilter.java:55)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at pub.servlet.TokenLoginFilter.doFilter(TokenLoginFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at pub.servlet.XssFilter.doFilter(XssFilter.java:89)
本文主要是讲述该种情况发生的原因及解决方案！
问题环境
| 软件 | 版本 |
|---|---|
| springboot | 2.1.8.RELEASE |
问题原因
这其实是一个坑！！！
一般遇到这种问题，找不出思路的话，单步调试是解决办法的最快办法。没必要去Google或者百度，因为每个人的情况不一定一致，其他人的博客也不一定将发生问题的环境说清楚。所以，别人可以的解决方案不一定适合当前环境！！！
经过重重跳转，终于发现了原因！原来是项目有设置了XssFilter，会将参数里面的敏感字符进行替换。其他会对抬头进行转换，代码如下：
public String getHeader(String name) {
String value = super.getHeader(xssEncode(name));
if (value != null) {
value = xssEncode(value);
}
return value;
}
如果，有读者遇到类似的问题，说不定就是在参数传递过程中，有其他类对参数进行了转换，导致问题的发生！！！
解决方案
将抬头进行转换的代码进行重构，不进行转换，直接返回原来的字符！
结果
顺利解决问题！！！
总结
遇到问题，本地有环境，可以先单步调试。先不网上找解决方案，因为可能找不到！！！
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