I'm trying to override the url_for
function globally. I want to do this so that I can load my assets from multiple urls to overcome the browser's maximum concurrent connections limit.
I used app.context_processor
to substitute my own function in templates, but it's not working when used with Flask-Assets.
STATIC_URLS = [
static.1.domain.com,
static.2.domain.com,
static.3.domain.com
]
@app.context_processor
def override_url_for():
return dict(url_for=static_urls)
def static_urls(endpoint, **values):
if endpoint == 'static':
filename = values.get('filename', None)
static_urls = app.config.get('STATIC_URLS', None)
if filename and static_urls:
hashed = int(hashlib.md5(filename.encode()).hexdigest(), 16)
index = hashed % len(static_urls) - 1
url = static_urls[index]
url = app.url_map.bind(url)
return url.build(endpoint, values=values, force_external=True)
return url_for(endpoint, **values)
In the template, url_for
works correctly, but ASSET_URL
does not.
{{ url_for('static', filename='style.css') }}
http://static.1.domain.com/static/style.css
{% assets 'style' %}
<link href="{{ ASSET_URL }}" rel="stylesheet" media="screen">
{% endassets %}
http://domain.com/static/style.css
How can I make this work in extensions like Flask-Assets?