https://github.com/square/okhttp/okhttp: An HTTP+HTTP/2 client for Android and Java applications 
interface okhttp3.internal.http2.Header$Listener
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: okhttp3.internal.http2.Header$Listener
  super_class: java.lang.Object
{
  public abstract void onHeaders(okhttp3.Headers);
    descriptor: (Lokhttp3/Headers;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
         Name  Flags
      headers  
}
SourceFile: "Header.java"
NestHost: okhttp3.internal.http2.Header
InnerClasses:
  abstract Listener = okhttp3.internal.http2.Header$Listener of okhttp3.internal.http2.Header