https://javaee.github.io/servlet-spec/: Java.net - The Source for Java Technology Collaboration (GlassFish Community) 
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
      wc    

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