https://tomcat.apache.org/: javax.servlet package 
public interface javax.servlet.http.HttpUpgradeHandler
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: javax.servlet.http.HttpUpgradeHandler
  super_class: java.lang.Object
{
  public abstract void init(javax.servlet.http.WebConnection);
    descriptor: (Ljavax/servlet/http/WebConnection;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
            Name  Flags
      connection  

  public abstract void destroy();
    descriptor: ()V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "HttpUpgradeHandler.java"