improve dockerfile and initial middleware

Author: lovemyliwu

Dockerfile

@@ -1,5 +1,7 @@
 FROM python:3.5
-ADD . /code
 WORKDIR /code
-RUN pip3 install -r requirements.txt -i https://mirrors.aliyun.com/pypi/simple && ./manage.py collectstatic --noinput
+ADD requirements.txt /code
+RUN pip3 install -r requirements.txt -i https://mirrors.aliyun.com/pypi/simple
+ADD . /code
+RUN ./manage.py collectstatic --noinput
 CMD ./run_uwsgi.sh 8000

applications/demo/middlewares.py

@@ -0,0 +1,10 @@
+from django.conf import settings
+
+
+class AddLinkHeaderMiddleware(object):
+    def process_response(self, request, response):
+        if not settings.ENABLE_SERVER_PUSH:
+            return response
+
+        response['Link'] = '</static/styles/index.css>; as=style; rel=preload'
+        return response

conf/settings.py

@@ -33,12 +33,13 @@
 # Application definition
 
 INSTALLED_APPS = (
-    'django.contrib.admin',
+    # 'django.contrib.admin',
     'django.contrib.auth',
     'django.contrib.contenttypes',
     'django.contrib.sessions',
     'django.contrib.messages',
     'django.contrib.staticfiles',
+    'applications.demo',
 )
 
 MIDDLEWARE_CLASSES = (
@@ -50,6 +51,7 @@
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
     'django.middleware.security.SecurityMiddleware',
+    'applications.demo.middlewares.AddLinkHeaderMiddleware',
 )
 
 ROOT_URLCONF = 'conf.urls'
@@ -104,3 +106,5 @@
 STATIC_URL = '/static/'
 STATIC_ROOT = str(BASE_DIR_PATH / 'static')
 STATICFILES_DIRS = [str(BASE_DIR_PATH / "applications/demo/static")]
+
+ENABLE_SERVER_PUSH = True