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A Django middleware that adds a HTTP/2 Server Push header to plain Django redirect responses

Project description

Django HTTP/2 Server Push redirects

A Django middleware that adds a HTTP/2 Server Push header to plain Django redirect responses.

This approach requires Django to be proxied by a server with HTTP/2 Server Push support. E.g. nginx>=1.3.9, apache2>=2.4.26 with mod_http2 enabled or a CDN services like Cloudflare.

Configuration

First configure your webserver to enable HTTP/2 and enable server push.

This looks something like this for nginx:

server {
  listen 443 ssl http2;
  listen [::]:443 ssl http2;
  ...

  location @python {
    proxy_set_header X-Forwarded-Proto $scheme;
    http2_push_preload on;
    ...
  }
}

The configuration for Apache and other servers/services is left as an exercise for the reader ;-).

Now make sure Django is able to detect if a request is secure by configuring the SECURE_PROXY_SSL_HEADER setting, e.g.:

SECURE_PROXY_SSL_HEADER = ('HTTP_X_FORWARDED_PROTO', 'https')

Then add 'push_redirect.middleware.Http2ServerPushRedirectMiddleware' to your project's MIDDLEWARE, making sure it's before Django's CommonMiddleware:

MIDDLEWARE = [
    ...
    'push_redirect.middleware.Http2ServerPushRedirectMiddleware',
    'django.middleware.common.CommonMiddleware',
    ...
]

This middleware adds the Link rel=preload header to redirect responses that should be preloaded.

If everything is configured correctly you should see that redirects no longer require an extra request the the webserver.

Inspiration / References

Project details


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1.0.0

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