id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
32891	runserver serve static files cached in debug	TZanke	TZanke	"Hello,

right now i experience a problem with runserver and serving static files.

1) open chrome 
2) open F12 debug tools
2) start runserver (Debug True)
3) open django site with a js/css required in head
4) have a look at a js/css file in network tab of debugger. At first the css/js file is loaded with status code 200, on F5 press maybe chrome just checks again an gets a 304. Fine. But sometime (at least 80% of the time) chrome does not check the server file again. I dont know why chrome does not refreshes the file every time when 'just' F5 is pressed. CTRL+F5 will fix the issue, but i think runserver with Debug=True should care about this problem itself to allow fast and easy development of js/css.

Possible fix: Add `add_never_cache_headers` to the `static.py` `serve` method

Right now i am not able to check the problem and fix on the latest version of Django, is there any simple way to setup a Django Environment with master branch to revalidate this issue?

Merge request on github: https://github.com/django/django/pull/14571

Right now i am not aware of all your django related requirements for submitting a code change / pull request / commit message / tests so please be gentle and take my pull request just as a possible example how to fix the issue. I know there is a lot more work to do.

Best regards
Tobias"	Bug	closed	contrib.staticfiles	3.2	Normal	wontfix			Unreviewed	1	0	0	0	1	0