Getting Connectivity error (Docker compose)

[4integration]

Hi,

Testing this UI with the docker-compose.yml below but when accessing Schema Registry UI (http://localhost:8000) I get Connectivity Error.
Testing Schema Registry on http://localhost:8084/config in a browser I get
{"compatibilityLevel":"BACKWARD"}

docker-compose.yml

version: '2.1'

services:
  zoo1:
    image: zookeeper:3.4.9
    container_name: zoo1
    hostname: zoo1
    ports:
      - "2181:2181"
    environment:
        ZOO_MY_ID: 1
        ZOO_PORT: 2181
        ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888
    volumes:
      - ./zk-multiple-kafka-multiple/zoo1/data:/data
      - ./zk-multiple-kafka-multiple/zoo1/datalog:/datalog

  zoo2:
    image: zookeeper:3.4.9
    container_name: zoo2
    hostname: zoo2
    ports:
      - "2182:2182"
    environment:
        ZOO_MY_ID: 2
        ZOO_PORT: 2182
        ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888
    volumes:
      - ./zk-multiple-kafka-multiple/zoo2/data:/data
      - ./zk-multiple-kafka-multiple/zoo2/datalog:/datalog

  zoo3:
    image: zookeeper:3.4.9
    container_name: zoo3
    hostname: zoo3
    ports:
      - "2183:2183"
    environment:
        ZOO_MY_ID: 3
        ZOO_PORT: 2183
        ZOO_SERVERS: server.1=zoo1:2888:3888 server.2=zoo2:2888:3888 server.3=zoo3:2888:3888
    volumes:
      - ./zk-multiple-kafka-multiple/zoo3/data:/data
      - ./zk-multiple-kafka-multiple/zoo3/datalog:/datalog


  kafka1:
    image: confluentinc/cp-kafka:5.0.1
    container_name: kafka1
    hostname: kafka1
    ports:
      - "9092:9092"
    environment:
      KAFKA_ADVERTISED_LISTENERS: LISTENER_DOCKER_INTERNAL://kafka1:19092,LISTENER_DOCKER_EXTERNAL://${DOCKER_HOST_IP:-127.0.0.1}:9092
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: LISTENER_DOCKER_INTERNAL:PLAINTEXT,LISTENER_DOCKER_EXTERNAL:PLAINTEXT
      KAFKA_INTER_BROKER_LISTENER_NAME: LISTENER_DOCKER_INTERNAL
      KAFKA_ZOOKEEPER_CONNECT: "zoo1:2181,zoo2:2182,zoo3:2183"
      KAFKA_BROKER_ID: 1
      KAFKA_LOG4J_LOGGERS: "kafka.controller=INFO,kafka.producer.async.DefaultEventHandler=INFO,state.change.logger=INFO"
    volumes:
      - ./zk-multiple-kafka-multiple/kafka1/data:/var/lib/kafka/data
    depends_on:
      - zoo1
      - zoo2
      - zoo3

  kafka2:
    image: confluentinc/cp-kafka:5.0.1
    container_name: kafka2
    hostname: kafka2
    ports:
      - "9093:9093"
    environment:
      KAFKA_ADVERTISED_LISTENERS: LISTENER_DOCKER_INTERNAL://kafka2:19093,LISTENER_DOCKER_EXTERNAL://${DOCKER_HOST_IP:-127.0.0.1}:9093
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: LISTENER_DOCKER_INTERNAL:PLAINTEXT,LISTENER_DOCKER_EXTERNAL:PLAINTEXT
      KAFKA_INTER_BROKER_LISTENER_NAME: LISTENER_DOCKER_INTERNAL
      KAFKA_ZOOKEEPER_CONNECT: "zoo1:2181,zoo2:2182,zoo3:2183"
      KAFKA_BROKER_ID: 2
      KAFKA_LOG4J_LOGGERS: "kafka.controller=INFO,kafka.producer.async.DefaultEventHandler=INFO,state.change.logger=INFO"
    volumes:
      - ./zk-multiple-kafka-multiple/kafka2/data:/var/lib/kafka/data
    depends_on:
      - zoo1
      - zoo2
      - zoo3

  kafka3:
    image: confluentinc/cp-kafka:5.0.1
    container_name: kafka3
    hostname: kafka3
    ports:
      - "9094:9094"
    environment:
      KAFKA_ADVERTISED_LISTENERS: LISTENER_DOCKER_INTERNAL://kafka3:19094,LISTENER_DOCKER_EXTERNAL://${DOCKER_HOST_IP:-127.0.0.1}:9094
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: LISTENER_DOCKER_INTERNAL:PLAINTEXT,LISTENER_DOCKER_EXTERNAL:PLAINTEXT
      KAFKA_INTER_BROKER_LISTENER_NAME: LISTENER_DOCKER_INTERNAL
      KAFKA_ZOOKEEPER_CONNECT: "zoo1:2181,zoo2:2182,zoo3:2183"
      KAFKA_BROKER_ID: 3
      KAFKA_LOG4J_LOGGERS: "kafka.controller=INFO,kafka.producer.async.DefaultEventHandler=INFO,state.change.logger=INFO"
    volumes:
      - ./zk-multiple-kafka-multiple/kafka3/data:/var/lib/kafka/data
    depends_on:
      - zoo1
      - zoo2
      - zoo3

      
  # https://github.com/yahoo/kafka-manager/  
  kafka_manager:
    image: hlebalbau/kafka-manager:stable
    container_name: kafka-manager
    hostname: kafka-manager
    ports:
      - "9000:9000"
    environment:
      ZK_HOSTS: "zoo1:2181,zoo2:2182,zoo3:2183"
      APPLICATION_SECRET: "random-secret"
    command: -Dpidfile.path=/dev/null

    

  kafka-schema-registry:
    image: confluentinc/cp-schema-registry:5.0.1
    container_name: kafka-schema-registry
    hostname: kafka-schema-registry
    ports:
      - "8084:8081"
    environment:
      SCHEMA_REGISTRY_KAFKASTORE_BOOTSTRAP_SERVERS: PLAINTEXT://kafka1:19092,PLAINTEXT://kafka2:19093,PLAINTEXT://kafka3:19094
      SCHEMA_REGISTRY_HOST_NAME: kafka-schema-registry
      SCHEMA_REGISTRY_LISTENERS: http://0.0.0.0:8081
    depends_on:
      - zoo1
      - zoo2
      - zoo3
      - kafka1
      - kafka2
      - kafka3

  # https://hub.docker.com/r/landoop/schema-registry-ui
  schema-registry-ui:
    image: landoop/schema-registry-ui:latest
    container_name: kafka-schema-registry-ui
    hostname: kafka-schema-registry-ui
    ports:
      - "8000:8000"
    environment:
      SCHEMAREGISTRY_URL: http://localhost:8084/
      #PROXY: "true"
      ALLOW_GLOBAL: "true"
      ALLOW_TRANSITIVE: "true"
      ALLOW_DELETION: "true"
    depends_on:
      - kafka-schema-registry

[spaghettifunk]

try the following

schema-registry-ui:
    image: landoop/schema-registry-ui:latest
    container_name: kafka-schema-registry-ui
    hostname: kafka-schema-registry-ui
    ports:
      - "8000:8000"
    environment:
      SCHEMAREGISTRY_URL: http://kafka-schema-registry:8084/ # <-- this is the difference
      PROXY: "true"
      ALLOW_GLOBAL: "true"
      ALLOW_TRANSITIVE: "true"
      ALLOW_DELETION: "true"
    depends_on:
      - kafka-schema-registry