Support conditional GET for static files

[joh]

It seems Flask doesn't support the conditional GET for static files. It always returns 200 OK, even though the file is older than the If-Modified-Since request header.

Consider the following example:

/static$ ls -l browser.css
-rw-r--r-- 1 joh joh 600 2010-07-13 22:25 browser.css

Now perform a conditional GET with curl:

$ curl -I -z "Tue, 13 Jul 2010 20:37:52 GMT" http://localhost:8080/static/browser.css
HTTP/1.0 200 OK
Content-Type: text/css; charset=utf-8
Cache-Control: public, max-age=43200
Expires: Wed, 14 Jul 2010 08:42:44 GMT
ETag: "flask-1279052703.2-600-2392659594"
Date: Tue, 13 Jul 2010 20:42:44 GMT
Connection: close
Server: Werkzeug/0.6.2 Python/2.6.5

Just as a comparison, here's the correct response from Apache:

$ curl -I -z "Tue, 13 Jul 2010 20:37:52 GMT" http://localhost/jq.html
HTTP/1.1 304 Not Modified
Date: Tue, 13 Jul 2010 20:43:47 GMT
Server: Apache/2.2.14 (Ubuntu)
ETag: "1540072-3f-48b36b51d6983"
Vary: Accept-Encoding

[joh]

Btw, my computer is in UTC+2, so the ls example is equivalent to 20:25 GMT

[mitsuhiko]

The combination of latest Werkzeug hg version + latest Flask git version works now. Werkzeug will release as 0.7 somewhere this month.