특정 url 모바일에서만 파일이 업로드 되지 않는데 원인이 뭘까요?

Question

프로젝트는 spring / java 1.8 / tomcat 9.0.29 를 사용중입니다. 5mb 정도의 gif파일을 업로드 하는데 PC웹에서는 문제없이 업로드 되고 모바일에서는 업로드 하기 전에 서버와의 연결이 끊어져요. 에러 내용은28-Feb-2020 17:02:04.607 SEVERE [https-openssl-apr-8443-exec-65] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [appServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Failed to parse multipart servlet request; nested exception is org.apache.commons.fileupload.FileUploadBase$IOFileUploadException: Processing of multipart/form-data request failed. java.io.IOException: The socket [139,987,815,502,240] associated with this connection has been closed.] with root cause java.io.IOException: The socket [139,987,815,502,240] associated with this connection has been closed. at org.apache.tomcat.util.net.AprEndpoint$AprSocketWrapper.checkClosed(AprEndpoint.java:2234) at org.apache.tomcat.util.net.AprEndpoint$AprSocketWrapper.doWrite(AprEndpoint.java:2313) at org.apache.tomcat.util.net.SocketWrapperBase.doWrite(SocketWrapperBase.java:814) at org.apache.tomcat.util.net.SocketWrapperBase.writeBlocking(SocketWrapperBase.java:550) at org.apache.tomcat.util.net.SocketWrapperBase.write(SocketWrapperBase.java:475) at org.apache.coyote.http2.Http2UpgradeHandler.writeWindowUpdate(Http2UpgradeHandler.java:808) at org.apache.coyote.http2.Stream$StreamInputBuffer.doRead(Stream.java:1127) at org.apache.coyote.Request.doRead(Request.java:551) at org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:336) at org.apache.catalina.connector.InputBuffer.checkByteBufferEof(InputBuffer.java:632) at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:362) at org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:132) at org.apache.commons.fileupload.MultipartStream$ItemInputStream.makeAvailable(MultipartStream.java:999) at org.apache.commons.fileupload.MultipartStream$ItemInputStream.read(MultipartStream.java:903) at java.io.InputStream.read(InputStream.java:101) at org.apache.commons.fileupload.util.Streams.copy(Streams.java:100) at org.apache.commons.fileupload.util.Streams.copy(Streams.java:70) at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:347) at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:115) at org.springframework.web.multipart.commons.CommonsMultipartResolver.parseRequest(CommonsMultipartResolver.java:158) at org.springframework.web.multipart.commons.CommonsMultipartResolver.resolveMultipart(CommonsMultipartResolver.java:142) at org.springframework.web.servlet.DispatcherServlet.checkMultipart(DispatcherServlet.java:1175) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1010) 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.doPost(FrameworkServlet.java:908) at javax.servlet.http.HttpServlet.service(HttpServlet.java:660) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) 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.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) 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.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) at org.apache.coyote.http2.StreamProcessor.service(StreamProcessor.java:362) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.http2.StreamProcessor.process(StreamProcessor.java:72) at org.apache.coyote.http2.StreamRunnable.run(StreamRunnable.java:35) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:748) 이렇게 소켓이 닫혀 버리는데 원인을 모르겠습니다...저용량의 파일을 업로드 할 때는 또 둘 다 되구요. 혹시 요청을 보낼 때 파일용량 같은 부분에 문제가 있나 싶어서 같은 서비스내의 다른 곳에서도 해당 파일을 업로드 해보았는데 모바일이더라도 이 url만 아니면 업로드가 문제없이 되더라구요... 혹시 의심할 만한 부분이 있을까요?업로드는 ajaxForm을 이용해 업로드 하고 있습니다.

특정 url 모바일에서만 파일이 업로드 되지 않는데 원인이 뭘까요?

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