# ContentType - text/css for css files in 304 Not Modified **URL:** \ **Category:** NGINX\ **Created:** [September 1, 2010, 10:24pm UTC](https://www.ruby-forum.com/t/contenttype-text-css-for-css-files-in-304-not-modified/194271 "2010-09-01T22:24:53Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![kevin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/2acd7d/32.png) [@kevin](https://www.ruby-forum.com/u/kevin)\ **Post date:** [September 1, 2010, 10:24pm UTC](https://www.ruby-forum.com/t/contenttype-text-css-for-css-files-in-304-not-modified/194271/1 "2010-09-01T22:24:53Z")
i want nginx to include ContentType text/css for css files in 304 Not Modified request here is the headers for the static css file request. you can see that there is no ContentType sent. GET /static/fan.css HTTP/1.1 Host: A.B.C.D User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.8) Gecko/20100722 Firefox/3.6.8 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,_/_;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,\*;q=0.7 Keep-Alive: 115 Connection: keep-alive If-Modified-Since: Wed, 01 Sep 2010 20:07:45 GMT Cache-Control: max-age=0 HTTP/1.1 304 Not Modified Server: nginx/0.8.49 Date: Wed, 01 Sep 2010 20:15:51 GMT Last-Modified: Wed, 01 Sep 2010 20:07:45 GMT Connection: keep-alive Expires: Thu, 31 Dec 2037 23:55:55 GMT Cache-Control: max-age=315360000 I can also confirm that in nginx config i have included mime.types which has the following: ``` text/html html htm shtml; text/css css; ``` ---
**Author:** ![kevin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/2acd7d/32.png) [@kevin](https://www.ruby-forum.com/u/kevin)\ **Post date:** [September 2, 2010, 1:40am UTC](https://www.ruby-forum.com/t/contenttype-text-css-for-css-files-in-304-not-modified/194271/2 "2010-09-02T01:40:28Z")
Hello! On Wed, Sep 01, 2010 at 01:23:38PM -0700, kevin wrote: > i want nginx to include ContentType text/css for css files in 304 Not > Modified request > > here is the headers for the static css file request. you can see that there > is no ContentType sent. RFC 2616 says about 304 responses: ([RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1 | RFC Editor](http://tools.ietf.org/html/rfc2616#section-10.3.5)) If the conditional GET used a strong cache validator (see section 13.3.3), the response SHOULD NOT include other entity-headers. Otherwise (i.e., the conditional GET used a weak validator), the response MUST NOT include other entity-headers; this prevents inconsistencies between cached entity-bodies and updated headers. Content-Type is entity header and not listed above this paragraph, so clearly qualifies as “other entity-headers”. Could you please clarify why you think RFC is wrong here and you need Content-Type in 304 response? Maxim D. ---
**Author:** ![kevin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/2acd7d/32.png) [@kevin](https://www.ruby-forum.com/u/kevin)\ **Post date:** [September 2, 2010, 3:03am UTC](https://www.ruby-forum.com/t/contenttype-text-css-for-css-files-in-304-not-modified/194271/3 "2010-09-02T03:03:35Z")
On Wed, Sep 1, 2010 at 4:39 PM, Maxim D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > so clearly qualifies as “other entity-headers”. > > Could you please clarify why you think RFC is wrong here and you > need Content-Type in 304 response? it is for a facebook app, and i do not have control over this. without this header the css file is not processed as css at all. ---
**Author:** ![kevin](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/2acd7d/32.png) [@kevin](https://www.ruby-forum.com/u/kevin)\ **Post date:** [September 2, 2010, 7:09pm UTC](https://www.ruby-forum.com/t/contenttype-text-css-for-css-files-in-304-not-modified/194271/4 "2010-09-02T19:09:35Z")
I’d offer to try disabling Last Modified header from your nginx and give reasonable high (30 days?) value in Expires header. Meanwhile you may report this error to whoever is assuming that absence of Content-Type is reason for not processing your css (facebook or facebook app developers, I’m not sure who you’re talking about but IMHO they all will at least comment on RFC position about this). If you’ll look at different servers sending 304 than you’ll see that google for example does not send Content Type. As well as [apache.org](http://apache.org) It’s perfectly valid and accepted practice. Alex.