code: public T requestHeadersSanitizer(
              Function<? super HttpHeaders, ? extends HttpHeaders> requestHeadersSanitizer) {
          this.requestHeadersSanitizer = requireNonNull(requestHeadersSanitizer, "requestHeadersSanitizer");
          return self();
      }
docs: Sets the {@link Function} to use to sanitize request headers before logging. It is common to have the
  {@link Function} that removes sensitive headers, like {@code Cookie}, before logging. If unset, will use
  {@link Function#identity()}.