我有一个简单的Spring Boot REST端点（通过SSL启用了Tomcat 9，启用了HTTP / 2），用于将文件上传为MultipartFile：
@PostMapping(value = "/upload/")
public String createAttachment(@RequestParam("file") MultipartFile file) {
// impl
}
通过Web浏览器/邮递员/失眠症在HTTP / 1.1上运行良好。但是，当我为Spring Boot的嵌入式Tomcat启用HTTP / 2支持时，端点抛出异常：
org.apache.tomcat.util.http.fileupload.MultipartStream$MalformedStreamException: Stream ended unexpectedly
at org.apache.tomcat.util.http.fileupload.MultipartStream$ItemInputStream.makeAvailable(MultipartStream.java:983) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.tomcat.util.http.fileupload.MultipartStream$ItemInputStream.read(MultipartStream.java:881) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at java.base/java.io.FilterInputStream.read(FilterInputStream.java:133) ~[na:na]
at org.apache.tomcat.util.http.fileupload.util.LimitedInputStream.read(LimitedInputStream.java:132) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at java.base/java.io.FilterInputStream.read(FilterInputStream.java:107) ~[na:na]
at org.apache.tomcat.util.http.fileupload.util.Streams.copy(Streams.java:98) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.tomcat.util.http.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:294) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.connector.Request.parseParts(Request.java:2868) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.connector.Request.parseParameters(Request.java:3196) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.connector.Request.getParameter(Request.java:1113) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:381) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:84) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:118) ~[spring-web-5.1.9.RELEASE.jar:5.1.9.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at com.kpsol.configuration.SimpleCorsFilter.doFilter(SimpleCorsFilter.java:32) ~[classes/:na]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.coyote.http2.StreamProcessor.service(StreamProcessor.java:355) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.coyote.http2.StreamProcessor.process(StreamProcessor.java:72) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at org.apache.coyote.http2.StreamRunnable.run(StreamRunnable.java:35) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.24.jar:9.0.24]
at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
在Tomcat 9上，对于HTTP / 2与HTTP / 1.1，在前端需要做些什么不同？我的前端当前是：
const formData = new FormData();
let file = event.target.files[0];
formData.append("file", file, file.name);
axios.post('/upload/', formData)
您能否显示上传的前端代码。