前端小程序调用服务端的文件上传接口，有一台安卓机上传一直报错：

报错日志：

• {"statusCode": 500, "header": {"Date": "Wed, 29 Mar 2023 06:45:39 GMT", "Content-Language": "en", "Server": "nginx", "Content-Type": "text/html;charset=utf-8", "Transfer-Encoding": "chunked", "Connection": "keep-alive", "protocol": "http/1.1"}, "data": "

  HTTP Status 500 – Internal Server Error

  ---

  Type Exception Report

  Message Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Failed to parse multipart servlet request; nested exception is org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found

  Description The server encountered an unexpected condition that prevented it from fulfilling the request.

  Exception

  org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Failed to parse multipart servlet request; nested exception is org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found\n\torg.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1013)\n\torg.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908)\n\tjavax.servlet.http.HttpServlet.service(HttpServlet.java:661)\n\torg.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)\n\tjavax.servlet.http.HttpServlet.service(HttpServlet.java:742)\n\torg.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)\n\torg.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)\n\torg.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)\n\torg.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)\n\torg.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)\n\torg.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:387)\n\torg.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)\n\torg.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)\n\torg.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357)\n\torg.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270)\n\torg.springframework.mobile.device.site.SitePreferenceRequestFilter.doFilterInternal(SitePreferenceRequestFilter.java:56)\n\torg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)\n\torg.springframework.mobile.device.DeviceResolverRequestFilter.doFilterInternal(DeviceResolverRequestFilter.java:60)\n\torg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)\n\torg.springframework.web.filter.ShallowEtagHeaderFilter.doFilterInternal(ShallowEtagHeaderFilter.java:108)\n\torg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)\n\torg.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)\n\torg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)\n

  Root Cause

  org.springframework.web.multipart.MultipartException: Failed to parse multipart servlet request; nested exception is org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found\n\torg.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:168)\n\torg.springframework.web.multipart.commons.CommonsMultipartResolver.resolveMultipart(CommonsMultipartResolver.java:142)\n\torg.springframework.web.servlet.DispatcherServlet.checkMultipart(DispatcherServlet.java:1176)\n\torg.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1011)\n\torg.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)\n\torg.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)\n\torg.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908)\n\tjavax.servlet.http.HttpServlet.service(HttpServlet.java:661)\n\torg.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)\n\tjavax.servlet.http.HttpServlet.service(HttpServlet.java:742)\n\torg.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)\n\torg.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)\n\torg.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)\n\torg.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)\n\torg.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)\n\torg.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:387)\n\torg.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)\n\torg.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)\n\torg.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357)\n\torg.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270)\n\torg.springframework.mobile.device.site.SitePreferenceRequestFilter.doFilterInternal(SitePreferenceRequestFilter.java:56)\n\torg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)\n\torg.springframework.mobile.device.DeviceResolverRequestFilter.doFilterInternal(DeviceResolverRequestFilter.java:60)\n\torg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)\n\torg.springframework.web.filter.ShallowEtagHeaderFilter.doFilterInternal(ShallowEtagHeaderFilter.java:108)\n\torg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)\n\torg.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)\n\torg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)\n

  Root Cause

  org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found\n\torg.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:990)\n\torg.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:310)\n\torg.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:334)\n\torg.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115)\n\torg.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:158)\n\torg.springframework.web.multipart.commons.CommonsMultipartResolver.resolveMultipart(CommonsMultipartResolver.java:142)\n\torg.springframework.web.servlet.DispatcherServlet.checkMultipart(DispatcherServlet.java:1176)\n\torg.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1011)\n\torg.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)\n\torg.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005)\n\torg.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:908)\n\tjavax.servlet.http.HttpServlet.service(HttpServlet.java:661)\n\torg.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882)\n\tjavax.servlet.http.HttpServlet.service(HttpServlet.java:742)\n\torg.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)\n\torg.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)\n\torg.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)\n\torg.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)\n\torg.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)\n\torg.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:387)\n\torg.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)\n\torg.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)\n\torg.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357)\n\torg.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270)\n\torg.springframework.mobile.device.site.SitePreferenceRequestFilter.doFilterInternal(SitePreferenceRequestFilter.java:56)\n\torg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)\n\torg.springframework.mobile.device.DeviceResolverRequestFilter.doFilterInternal(DeviceResolverRequestFilter.java:60)\n\torg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)\n\torg.springframework.web.filter.ShallowEtagHeaderFilter.doFilterInternal(ShallowEtagHeaderFilter.java:108)\n\torg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)\n\torg.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)\n\torg.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:109)\n

  Note The full stack trace of the root cause is available in the server logs.

  ---

  Apache Tomcat/8.5.37

  ", "cookies": [], "errMsg": "uploadFile:ok"} 123432123432 success

具体报错是这段：
Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Failed to parse multipart servlet request; nested exception is org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found

原因：

前端在上传照片时，headers写死了 content-type="multipart/form-data"，导致浏览器无法在请求头加上boundary标识，产生冲突

解决方案：

前端headers设置 contentType:false或者注掉contentType，这样上传图片request请求会自动添加这个请求参数的格式和boundary标识，就不会报错了

 本文参考FileUploadException: the request was rejected because no multipart boundary was found_shangqing.liu的博客-CSDN博客

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