今天我决定对现有的Django REST + Angular应用进行dockerize。网站显示正常，但CORS请求被阻止。
CORS策略已阻止从源“http://localhost:3000”访问“http://localhost:8000/branches/1”处的XMLHttpRequest：请求的资源上不存在“Access-Control-Allow-Origin”标头。
Angular App使用Nginx进行dockerized。我正在使用this教程（下面列出了docker + compose文件）。
奇怪的是，我以前遇到过这个问题，并通过使用 djang-cors-headers 包解决了它。沿着CORS_ORIGIN_ALLOW_ALL = True，这似乎不再解决问题。
这是否与应用程序现在在容器中运行有关？我提供了项目的dockerfiles沿着下面的docker-compose文件。但不确定它们是否相关。
Angular项目的Dockerfile：

FROM tiangolo/node-frontend:10 as build-stage
WORKDIR /app

COPY package*.json /app/
RUN npm install

COPY ./ /app/
ARG configuration=production
RUN npm run build -- --output-path=./dist/out --configuration $configuration

# Stage 1, based on Nginx, to have only the compiled app, ready for production with Nginx
FROM nginx:1.15
COPY --from=build-stage /app/dist/out/ /usr/share/nginx/html

# Copy the default nginx.conf provided by tiangolo/node-frontend
COPY --from=build-stage /nginx.conf /etc/nginx/conf.d/default.confenter

Django REST项目的Dockerfile：

# Pull base image
FROM python:3.7

# Set environment varibles
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

# create root directory
RUN mkdir /web

# set working directory
WORKDIR /web

# Coppy current directory contents into the container
ADD . /web/

# Install any needed packages in requirements.txt
RUN pip install -r requirements.txt

docker-compose.yml文件：

version: '3'

services:
  db:
    image: mysql:5.7
    restart: always
    container_name: db
    environment:
      - MYSQL_HOST=localhost
      - MYSQL_PORT=3306  # cannot change this port to other number
      - MYSQL_ROOT_HOST=%
      - MYSQL_DATABASE=test
      - MYSQL_USER=belter
      - MYSQL_PASSWORD=belter_2017
      - MYSQL_ROOT_PASSWORD=123456_abc
    ports:
      - '3302:3306'

  web:
    build: ./orca/
    restart: always
    command: bash -c "python manage.py makemigrations && python manage.py migrate && python manage.py runserver 0.0.0.0:8000"
    container_name: web
    volumes:
      - ./orca:/code
    ports:
      - '8000:8000'
    depends_on:
      - db

  angular:
    build: ./ng-orca-new/
    container_name: angular
    ports:
      - '3000:80'

先谢谢你了！