Serve static files from a CDN rather than Flask in production

by

There’s no need to change how you link to static files, you can still use url_for('static', filename="myfile.txt"). Replace the default static view with one that redirects to the CDN if it is configured.

from urllib.parse import urljoin
# or for python 2: from urlparse import urljoin
from flask import redirect

@app.endpoint('static')
def static(filename):
    static_url = app.config.get('STATIC_URL')

    if static_url:
        return redirect(urljoin(static_url, filename))

    return app.send_static_file(filename)

Whether you’re on a dev machine or production, set the STATIC_URL config value to the CDN and requests for static files will be redirected there.

Redirects are relatively cheap, and are remembered by browsers. If you get to the point where performance is meaningfully affected by them, you can write a function that links directly when using the CDN.

@app.template_global()
def static_url(filename):
    static_url = app.config.get('STATIC_URL')

    if static_url:
        return urljoin(static_url, filename)

    return url_for('static', filename=filename)

The template_global decorator makes the function available in all templates. Use it instead of url_for when you need urls for static files.

There may be a Flask extension that does this for you already. For example, Flask-S3 provides a url_for that serves static files from AWS S3.

More Related Contents:

  1. Link to Flask static files with url_for
  2. Passing HTML to template using Flask/Jinja2
  3. Reference template variable within Jinja expression
  4. Is it possible to use AngularJS with the Jinja2 template engine?
  5. Serve image stored in SQLAlchemy LargeBinary column
  6. Create dynamic arguments for url_for in Flask
  7. Display image stored as binary blob in template
  8. How to iterate through a list of dictionaries in Jinja template?
  9. Remove unnecessary whitespace from Jinja rendered template
  10. Python Flask Render Text from Variable like render_template
  11. Reload Flask app when template file changes
  12. How to render by Vue instead of Jinja
  13. Jinja render text in HTML preserving line breaks
  14. How to generate an html directory list using Python
  15. Link to a specific location in a Flask template
  16. Converting Flask form data to JSON only gets first value
  17. How to use g.user global in flask
  18. ImportError: cannot import name ‘Markup’ from ‘jinja2’
  19. Returning rendered template with Flask-Restful shows HTML in browser
  20. Global variables in Flask templates
  21. Flask raises TemplateNotFound error even though template file exists
  22. Is the server bundled with Flask safe to use in production?
  23. Handle Flask requests concurrently with threaded=True
  24. Make a POST request while redirecting in flask
  25. redirect while passing arguments
  26. What is the purpose of Flask’s context stacks?
  27. How to delete a record by id in Flask-SQLAlchemy
  28. Gunicorn can’t find app when name changed from “application”
  29. How do I run a long-running job in the background in Python
  30. ModuleNotFoundError: No module named ‘MySQLdb’

Leave a Comment