New Django middleware not getting called

Question

I am quite new to web development. I am working on a website hosted on amazon ec2 server. The site is in python using django framework. I am using memcached to cache some client information. My site and caching works on local machine but not on the EC2 server. I checked memcached server and found out that it was not able to set the keys. Is there something I might need to change in settings.py so that keys are set appropriately on the server or something else that I might be missing.

EDIT: Found out the problem. I added a new middleware for setting keys in the memcache. That is not getting called. It works perfectly on the local machine. On the server I am using gunicorn as the app server and nginx as the reverse proxy. Can any of these cause the problems. Also I tried to reload nginx but that didn't help either.

Answer 1

It was a silly glitch. I found out that i needed to reload gunicorn server to make the new middleware work. Thanks everybody for the help.

Answer 2

Is it a case of add this to your settings.py?

MIDDLEWARE_CLASSES = (
    'django.middleware.common.CommonMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.cache.UpdateCacheMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.cache.FetchFromCacheMiddleware',
)

From the docs.

Only I'm not too clear what steps you mean when you say you 'added a new middleware'.

Answer 3

First of all, you need to set caching in CACHES setting, taking into account all credentials needed to access the cache server: https://docs.djangoproject.com/en/dev/topics/cache/#memcached

Also make sure the cache server is accessible from the instance you are trying to use.

When it comes to using new middleware (a slightly different issue), then:

• make sure it is defined properly in the settings (not overwritten by other settings, like eg. commonly used local_settings.py file, which should be different depending on the environment you use),
• make sure middleware class is defined properly (defines eg. process_request(), if you want to do something for the incoming request),
• if you are using eg. mod_wsgi with Apache, remember to reload the service (in this case Apache), by eg. invoking sudo service apache2 reload (as in the mentioned case),