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https://issues.apache.org/jira/browse/TIKA-3686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17500804#comment-17500804
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Nick Burch commented on TIKA-3686:
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Detecting types of text-based files with magic is always going to fail for some
cases. There are no sure-fire things to match on, only guesses
If you're sure that your files have the right extensions on them, just ask Tika
to detect by filename only, no contents
> CSS file detected as JavaScript (application/javascript)
> --------------------------------------------------------
>
> Key: TIKA-3686
> URL: https://issues.apache.org/jira/browse/TIKA-3686
> Project: Tika
> Issue Type: Bug
> Components: detector
> Affects Versions: 2.0.0-ALPHA
> Reporter: Marius Dumitru Florea
> Priority: Major
>
> The following CSS file
> [https://github.com/techlab/jquery-smartwizard/blob/v5.1.1/dist/css/smart_wizard_all.min.css]
> is detected as {{application/javascript}} using:
> {noformat}
> TikaUtils.detect(InputStream stream, String name)
> {noformat}
> The reason seems to be that the CSS file starts with:
> {noformat}
> /*!
> * jQuery
> {noformat}
> which matches the "jQuery" entry from
> [tika-mimetypes.xml|https://github.com/apache/tika/blob/2.3.0/tika-core/src/main/resources/org/apache/tika/mime/tika-mimetypes.xml#L348]
> used by Tika's {{MimeTypes}} detector.
> This is a regression introduced by
> https://github.com/apache/tika/commit/97699598f000139b1222b785d634b3c8a8e216c7
> in TIKA-1141 (2.0.0-ALPHA).
> The implications are serious if the mime type returned by Tika is used to set
> the content type on the HTTP request returning the CSS file to the browser:
> the browser ignores the CSS.
> FTR, in my case the CSS file is not served directly from the file system but
> from a WebJar (in this case
> https://search.maven.org/artifact/org.webjars.npm/smartwizard/5.1.1/jar ) and
> we're using Tika to determine the type of files requested from the WebJars.
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