Failed to parse multipart servlet request； nested exception is javax.servlet.ServletException:

org.springframework.web.multipart.MultipartException: Failed to parse multipart servlet request; nested exception is javax.servlet.ServletException: org.apache.tomcat.util.http.fileupload.impl.InvalidContentTypeException: the request doesn’t contain a multipart/form-data or multipart/mixed stream, content type header is null
at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.handleParseFailure