gravitee envoy steps to Reproduce

docker-compose.yaml

version: "3.7"
services:

  envoy:
    build:
      context: .
      dockerfile: Dockerfile-envoy
    volumes:
      - ./envoy.yaml:/etc/envoy.yaml
    networks:
      - envoymesh
    expose:
      - "80"
      - "8001"
    ports:
      - "8080:80"
      - "8001:8001"

  swagger:
    image: swaggerapi/swagger-ui
    container_name: "swagger-ui"
    expose:
      - 8080
    ports:
      - "8081:8080"
    volumes:
      - ./petstore.json:/petstore.json
    networks:
      envoymesh:
        aliases:
          - swagger
    environment:
      BASE_URL: /swagger-ui
      SWAGGER_JSON: /petstore.json

networks:
  envoymesh: {}

Dockerfile-envoy

FROM envoyproxy/envoy-dev:latest
CMD /usr/local/bin/envoy -c /etc/envoy.yaml

envoy.yaml

static_resources:
  listeners:
  - address:
      socket_address:
        address: 0.0.0.0
        port_value: 80
    filter_chains:
    - filters:
      - name: envoy.http_connection_manager
        typed_config:
          "@type": type.googleapis.com/envoy.config.filter.network.http_connection_manager.v2.HttpConnectionManager
          access_log:
          - name: envoy.file_access_log
            config:
              path: "/dev/stdout"
          codec_type: HTTP1
          stat_prefix: ingress_http
          route_config:
            name: local_route
            virtual_hosts:
            - name: backend
              domains:
              - "*"
              routes:
              - match:
                  prefix: "/"
                route:
                  cluster: swagger
          http_filters:
          - name: envoy.router
            typed_config: {}
  clusters:
  - name: swagger
    connect_timeout: 0.25s
    type: strict_dns
    lb_policy: round_robin
    load_assignment:
      cluster_name: swagger
      endpoints:
      - lb_endpoints:
        - endpoint:
            address:
              socket_address:
                address: swagger
                port_value: 8080
admin:
  access_log_path: "/dev/stdout"
  address:
    socket_address:
      address: 0.0.0.0
      port_value: 8001

petstore.json

{
  "swagger": "2.0",
  "info": {
    "version": "1.0.0",
    "title": "Swagger Petstore",
    "license": {
      "name": "MIT"
    }
  },
  "host": "petstore.swagger.io",
  "basePath": "/v1",
  "schemes": [
    "http"
  ],
  "consumes": [
    "application/json"
  ],
  "produces": [
    "application/json"
  ],
  "paths": {
    "/pets": {
      "get": {
        "summary": "List all pets",
        "operationId": "listPets",
        "tags": [
          "pets"
        ],
        "parameters": [
          {
            "name": "limit",
            "in": "query",
            "description": "How many items to return at one time (max 100)",
            "required": false,
            "type": "integer",
            "format": "int32"
          }
        ],
        "responses": {
          "200": {
            "description": "An paged array of pets",
            "headers": {
              "x-next": {
                "type": "string",
                "description": "A link to the next page of responses"
              }
            },
            "schema": {
              "$ref": "#/definitions/Pets"
            }
          },
          "default": {
            "description": "unexpected error",
            "schema": {
              "$ref": "#/definitions/Error"
            }
          }
        }
      },
      "post": {
        "summary": "Create a pet",
        "operationId": "createPets",
        "tags": [
          "pets"
        ],
        "responses": {
          "201": {
            "description": "Null response"
          },
          "default": {
            "description": "unexpected error",
            "schema": {
              "$ref": "#/definitions/Error"
            }
          }
        }
      }
    },
    "/pets/{petId}": {
      "get": {
        "summary": "Info for a specific pet",
        "operationId": "showPetById",
        "tags": [
          "pets"
        ],
        "parameters": [
          {
            "name": "petId",
            "in": "path",
            "required": true,
            "description": "The id of the pet to retrieve",
            "type": "string"
          }
        ],
        "responses": {
          "200": {
            "description": "Expected response to a valid request",
            "schema": {
              "$ref": "#/definitions/Pets"
            }
          },
          "default": {
            "description": "unexpected error",
            "schema": {
              "$ref": "#/definitions/Error"
            }
          }
        }
      }
    }
  },
  "definitions": {
    "Pet": {
      "required": [
        "id",
        "name"
      ],
      "properties": {
        "id": {
          "type": "integer",
          "format": "int64"
        },
        "name": {
          "type": "string"
        },
        "tag": {
          "type": "string"
        }
      }
    },
    "Pets": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/Pet"
      }
    },
    "Error": {
      "required": [
        "code",
        "message"
      ],
      "properties": {
        "code": {
          "type": "integer",
          "format": "int32"
        },
        "message": {
          "type": "string"
        }
      }
    }
  }
}