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https://issues.apache.org/jira/browse/TIKA-2671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16514112#comment-16514112
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Tim Allison commented on TIKA-2671:
-----------------------------------
+1 Thank you for raising this. We're currently using CONTENT_TYPE_HINT to
record what was extracted from the meta-header. I guess we should create a new
property that the HTMLEncodingDetector should use.
To confirm the algorithm:
1) Trust the actual http header
2) If that doesn't exist, trust the html meta-header
3) If that doesn't exist, fall back on charset detection
The best solution would probably be to try each (when they differ) and create
an out-of-vocabulary score based on tika-eval's word lists and pick the
encoding with the lowest OOV%.
Short of that, though, how does the above look? Any interest in putting
together a PR?
> HtmlEncodingDetector doesnt take provided metadata into account
> ---------------------------------------------------------------
>
> Key: TIKA-2671
> URL: https://issues.apache.org/jira/browse/TIKA-2671
> Project: Tika
> Issue Type: Bug
> Reporter: Gerard Bouchar
> Priority: Major
>
> org.apache.tika.parser.html.HtmlEncodingDetector ignores the document's
> metadata. So when using it to detect the charset of an HTML document that
> came with a conflicting charset specified at the transport layer level, the
> encoding specified inside the file is used instead.
> This behavior does not conform to what is [specified by the W3C for
> determining the character encoding of HTML
> pages|https://html.spec.whatwg.org/multipage/parsing.html#determining-the-character-encoding].
> This causes bugs similar to NUTCH-2599.
>
> If HtmlEncodingDetector is not meant to take into account meta-information
> about the document, then maybe another detector should be provided, that
> would be a CompositeDetector including, in that order:
> * a new, simple, MetadataEncodingDetector, that would simply return the
> encoding
> * the existing HtmlEncodingDetector
> * a generic detector, like UniversalEncodingDetector
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