*** Could not read served logs: Invalid URL 'http://:8793/log/dag_id= .... No host supplied

[GeorgesNass]

Airflow with Docker Compose: Log reading error (Invalid URL)

Disclaimer

I have already searched for similar issues in the Airflow GitHub and forums.
However, I found that most of the existing threads are either ambiguous or incomplete.
To avoid confusion, I am providing all my configuration files and steps here so that the community can help me resolve this issue precisely.

Context

I’m trying to deploy Apache Airflow with Docker Compose on a dedicated VM.
I built a custom image (airflow-mlops:latest) and configured Postgres as the backend.
However, I always get an error when trying to read task logs in the Web UI:

*** Could not read served logs: Invalid URL 'http://:8793/log/dag_id=main_pipeline_dag/run_id=manual__2025-09-04T14:39:22.889935+00:00/task_id=task_live_data/attempt=1.log': No host supplied

---

Environment

• VM: 4 vCPU / 16 GB RAM / 200 GB SSD
• OS: Debian GNU/Linux 12 (bookworm)
• Python: 3.10 (inside Airflow container)
• Airflow: 2.10.2
• Executor: LocalExecutor
• Database: Postgres 13 (dedicated container)
• Docker / Compose: latest version

---

Configuration files

.env

## ==== Airflow Core configuration ====
AIRFLOW__CORE__EXECUTOR=LocalExecutor
AIRFLOW__CORE__BASE_LOG_FOLDER=/opt/airflow/logs
AIRFLOW__CORE__REMOTE_LOGGING=False

## ==== Airflow Webserver configuration ====
AIRFLOW__WEBSERVER__BASE_URL=http://**<REAL_IPV4_ADDRESS>**:8080
AIRFLOW__WEBSERVER__SECRET_KEY=BdvwS7wrRA9s9ZkYmIPhrYq04rQLv6rrIImfo8WV8nCmvLyysIygopv2JmWHCJN6XSg

## ==== Airflow Logging configuration ====
AIRFLOW__LOGGING__WORKER_LOG_SERVER_ADDRESS=**<REAL_IPV4_ADDRESS>**
AIRFLOW__LOGGING__WORKER_LOG_SERVER_PORT=8793
AIRFLOW__LOGGING__BASE_LOG_FOLDER=/opt/airflow/logs

Dockerfile

FROM apache/airflow:2.10.2-python3.10

WORKDIR /opt/airflow

COPY requirements.txt /opt/airflow/requirements.txt

USER airflow
RUN pip install --no-cache-dir --progress-bar=off -r /opt/airflow/requirements.txt

COPY --chown=airflow:airflow src /opt/airflow/src
COPY --chown=airflow:airflow dags /opt/airflow/dags

ENV PYTHONPATH="/opt/airflow:${PYTHONPATH}"

EXPOSE 8080
CMD ["webserver"]

docker-compose.yaml

  GNU nano 7.2                                                                           docker-compose.yaml                                                                                     
version: "3.9"

x-airflow-common: &airflow-common
  image: airflow-mlops:latest
  env_file:
    - .env
  environment:
    GUNICORN_CMD_ARGS: "--workers 1 --threads 1 --timeout 120"
    PYTHONPATH: /opt/airflow
    AIRFLOW__DATABASE__SQL_ALCHEMY_CONN: postgresql+psycopg2://airflow:airflow@postgres:5432/airflow
    AIRFLOW__CORE__EXECUTOR: LocalExecutor
  volumes:
    - ./dags:/opt/airflow/dags
    - ./src:/opt/airflow/src
    - ./data:/opt/airflow/data
    - ./logs:/opt/airflow/logs
  user: "${AIRFLOW_UID:-50000}:0"
  depends_on:
    postgres:
      condition: service_healthy

services:
  postgres:
    image: postgres:13
    environment:
      POSTGRES_USER: airflow
      POSTGRES_PASSWORD: airflow
      POSTGRES_DB: airflow
    volumes:
      - postgres-db-volume:/var/lib/postgresql/data
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U airflow"]
      interval: 5s
      retries: 5
    restart: always
    security_opt:
      - seccomp=unconfined

  airflow-webserver:
    <<: *airflow-common
    build:
      context: .
      dockerfile: Dockerfile
    command: webserver
    ports:
      - "8080:8080"
    restart: always

  airflow-scheduler:
    <<: *airflow-common
    command: scheduler
    restart: always

  ## Init (migration DB + création user admin)
  airflow-init:
    <<: *airflow-common
    command: bash -c "airflow db upgrade && airflow users create --username airflow --password airflow --firstname Admin --lastname User --role Admin --email [email protected]"
    profiles: ["init"]

volumes:
  postgres-db-volume:

---

Commands used

docker compose down -v --remove-orphans
docker compose build --no-cache
docker compose up airflow-init
docker compose up -d
docker ps

---

Problem

• Airflow UI works (I can log in).
• DAGs are detected and can be triggered.
• BUT when I try to read logs from a task, I get this error:

*** Could not read served logs: Invalid URL 'http://:8793/log/...': No host supplied

---

How can I fix this invalid log URL issue?

Thanks in advance for any help!

[yimingpeng]

Hello @GeorgesNass,

I tried to reproduce the error with your setup but couldn't replicate it on my end. This could be environment-specific since I only tested on my MacBook.

I think some additional information would help with troubleshooting. Could we try the following:

1. Can you check whether the log files are successfully created in /opt/airflow/logs after you trigger the DAG? I suspect the task might fail before logs are even created or get corrupted (e.g., permission issues?)?
2. Can you provide your test DAG (please remove any sensitive info)?

Thanks