https://tomcat.apache.org/: Tomcat Connectors and HTTP parser 
public interface org.apache.tomcat.util.http.fileupload.UploadContext extends org.apache.tomcat.util.http.fileupload.RequestContext
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.apache.tomcat.util.http.fileupload.UploadContext
  super_class: java.lang.Object
{
  public abstract long contentLength();
    descriptor: ()J
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "UploadContext.java"