https://github.com/square/okhttp/okhttp: An HTTP+HTTP/2 client for Android and Java applications 
class okhttp3.EventListener$1 extends okhttp3.EventListener
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: okhttp3.EventListener$1
  super_class: okhttp3.EventListener
{
  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // okhttp3.EventListener$1 this
         0: .line 53
            aload 0 /* this */
            invokespecial okhttp3.EventListener.<init>:()V
            return
        end local 0 // okhttp3.EventListener$1 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lokhttp3/EventListener$1;
}
SourceFile: "EventListener.java"
EnclosingMethod: okhttp3.EventListener
NestHost: okhttp3.EventListener
InnerClasses:
  okhttp3.EventListener$1