public interface org.eclipse.jetty.io.Connection$UpgradeFrom
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.eclipse.jetty.io.Connection$UpgradeFrom
  super_class: java.lang.Object
{
  public abstract java.nio.ByteBuffer onUpgradeFrom();
    descriptor: ()Ljava/nio/ByteBuffer;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "Connection.java"
NestHost: org.eclipse.jetty.io.Connection
InnerClasses:
  public abstract UpgradeFrom = org.eclipse.jetty.io.Connection$UpgradeFrom of org.eclipse.jetty.io.Connection