java – multiple uploads was failed using dio in flutter(Spring Boot, Flutter)

when i usign postman, it was successful all of time. but flutter using dio was not working multiple uploading.At the first time uploadig was successful, but second time upload was failed. Spring boot Exception: java.io.EOFException: null at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.fillReadBuffer(NioEndpoint.java:1306) ~[tomcat-embed-core-9.0.58.jar!/:na] at org.apache.tomcat.util.net.NioEndpoint$NioSocketWrapper.read(NioEndpoint.java:1218) ~[tomcat-embed-core-9.0.58.jar!/:na] at org.apache.coyote.http11.Http11InputBuffer.fill(Http11InputBuffer.java:805) ~[tomcat-embed-core-9.0.58.jar!/:na] at org.apache.coyote.http11.Http11InputBuffer.access$400(Http11InputBuffer.java:42) ~[tomcat-embed-core-9.0.58.jar!/:na] at org.apache.coyote.http11.Http11InputBuffer$SocketInputBuffer.doRead(Http11InputBuffer.java:1185) ~[tomcat-embed-core-9.0.58.jar!/:na] at org.apache.coyote.http11.filters.IdentityInputFilter.doRead(IdentityInputFilter.java:101) ~[tomcat-embed-core-9.0.58.jar!/:na] at … Read more