code: @NonNull
      public ReplicatorConfiguration setHeaders(Map<String, String> headers) {
          if (readonly) { throw new IllegalStateException("ReplicatorConfiguration is readonly mode."); }
          this.headers = new HashMap<>(headers);
          return getReplicatorConfiguration();
      }
docs: Sets the extra HTTP headers to send in all requests to the remote target.
  
  @param headers The HTTP Headers.
  @return The self object.