text: // Copyright 2019 Google LLC
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  #pragma once
  
  #include <string>
  
  #include "common/common/logger.h"
  #include "envoy/http/filter.h"
  #include "envoy/http/header_map.h"
  #include "extensions/filters/http/common/pass_through_filter.h"
  #include "src/envoy/http/backend_routing/filter_config.h"
  
  namespace Envoy {
  namespace Extensions {
  namespace HttpFilters {
  namespace BackendRouting {
  
  class Filter : public Http::PassThroughDecoderFilter,
                 public Logger::Loggable<Logger::Id::filter> {
   public:
    Filter(FilterConfigSharedPtr config);
  
    // Http::StreamDecoderFilter
    Http::FilterHeadersStatus decodeHeaders(Http::HeaderMap&, bool) override;
  
   private:
    const FilterConfigSharedPtr config_;
  };
  
  }  // namespace BackendRouting
  }  // namespace HttpFilters
  }  // namespace Extensions
  }  // namespace Envoy
  