Docker部署Ruby/Rails应用自动跳转HTTPS致本地访问异常求助

我将一个Ruby应用Docker化后，本地访问时所有浏览器都会从http://0.0.0.0:3000重定向到https://0.0.0.0:3000，导致浏览器报错：

This site can’t provide a secure connection 0.0.0.0 sent an invalid response.

我已尝试清除缓存、浏览记录、重启设备，并在Docker Compose的环境变量中添加了HTTPS_METHOD: noredirect，但问题仍未解决。直接通过Rails server访问http://127.0.0.1:3000时不会出现重定向，可正常访问，因此推测问题出在Dockerfile或Docker Compose配置中。现附上相关配置文件，恳请提供解决建议。

Dockerfile #

FROM ruby:2.7.7-alpine3.16 AS builder

ENV RAILS_ENV production
ENV RAILS_SERVE_STATIC_FILES true
ENV RAILS_LOG_TO_STDOUT true
ENV SECRET_KEY_BASE 1

# RUN mkdir /app
# WORKDIR /app

# Install required libraries on Alpine
# note: build-base required for nokogiri gem
# note: postgresql-dv required for pg gem
RUN apk update && \
    apk add tzdata postgresql-dev && \
    apk add postgresql-client && \
    apk add nodejs yarn && \
    apk add build-base && \
    gem install rails bundler && \
    # Throw errors if Gemfile has been modified since Gemfile.lock
    bundle config --global frozen 1

# Copy Gemfile so we can cache gems
COPY Gemfile Gemfile.lock ./

# Install Ruby gems
RUN bundle install --without development test

# Copy all application files
COPY . .

# Precompile assets
RUN bundle exec rails assets:precompile && \
    bundle exec rails webpacker:compile


RUN chmod +x entrypoint.sh
CMD ["/entrypoint.sh"]


EXPOSE 3000

Docker Compose配置 #

version: "3.8"

services:
  rails:

    build:
      dockerfile: Dockerfile
      context: .
    env_file:
      - rails.env
    environment:
      HTTPS_METHOD: noredirect
      DB_USERNAME: xxxxxxxx
      DB_PASSWORD: .env
      DB_DATABASE: xxxxxx_production
      DB_PORT: 5432
      DB_HOST: db
      RAILS_MAX_THREADS: 5
      
    ports:
      - "3000:3000"
    restart: always
    depends_on:
      - "db"
  db:
    image: postgres:13.9-alpine
    env_file:
      - db.env
    environment:
      HTTPS_METHOD: noredirect
      POSTGRES_USER: xxxxxxx
      PGDATA: /var/lib/postgresql/data/pgdata  
    restart: always
    volumes:
      - pgdata:/var/lib/postgresql/data

volumes:
  pgdata:

entrypoint.sh脚本 #

#!/bin/sh

# Note: !/bin/sh must be at the top of the line,
# Alpine doesn't have bash so we need to use shell.
# Docker entrypoint script.
# Don't forget to give this file execution rights via `chmod +x entrypoint.sh`
# which I've added to the Dockerfile but you could do this manually instead.

# Wait until Postgres is ready before running the next step.
while ! pg_isready -q -h $DB_HOST -p $DB_PORT -U $DB_USERNAME
do
  echo "$(date) - waiting for database to start."
  sleep 2
done

# If the database exists, migrate. Otherwise setup (create and migrate)
echo "Running database migrations..."
bundle exec rails db:migrate 2>/dev/null || bundle exec rails db:create db:migrate
echo "Finished running database migrations."

# Remove a potentially pre-existing server.pid for Rails.
echo "Deleting server.pid file..."
rm -f /tmp/pids/server.pid

# Start the server.
echo "Starting rails server..."
bundle exec rails server

• 禁用Rails生产环境强制HTTPS：在Docker Compose的rails服务environment块中添加RAILS_FORCE_SSL: false。你之前设置的HTTPS_METHOD是Nginx的配置项，对Rails自身的重定向逻辑无效，而Rails生产环境默认开启force_ssl，这是导致HTTP重定向到HTTPS的核心原因。
• 明确指定Rails服务器绑定地址：修改entrypoint.sh中的启动命令为bundle exec rails server -b 0.0.0.0，确保服务器监听容器内所有网络接口，避免因绑定地址问题引发的异常。
• 检查rails.env文件：确认该文件中没有设置FORCE_SSL=true或其他会触发HTTPS重定向的配置，防止环境变量冲突。
• 本地访问改用127.0.0.1：建议访问http://127.0.0.1:3000而非http://0.0.0.0:3000，部分浏览器对0.0.0.0的处理可能引发异常。
• 修改Rails配置文件（兜底方案）：如果环境变量不生效，直接编辑config/environments/production.rb，将config.force_ssl = true改为config.force_ssl = false，或者改为动态读取环境变量：config.force_ssl = ENV.fetch("RAILS_FORCE_SSL", "false") == "true"，这样可以灵活控制是否开启强制HTTPS。

内容的提问来源于stack exchange，提问作者GidB