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https://issues.apache.org/jira/browse/TIKA-3710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17539582#comment-17539582
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Nick Burch commented on TIKA-3710:
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I was thinking we'd do (open)h1(close) or (open)h1(space) to cover both HTML
cases but reduce the changes of a false positive match (+h2/h3)
> HTML document detected incorrect as message/rfc822
> --------------------------------------------------
>
> Key: TIKA-3710
> URL: https://issues.apache.org/jira/browse/TIKA-3710
> Project: Tika
> Issue Type: Bug
> Components: detector
> Affects Versions: 2.3.0
> Reporter: Sam Stephens
> Priority: Major
> Attachments: html-that-looks-like-rfc822.html
>
>
> I'm detecting content types and extracting text from documents using the
> AutoDetectParser.
> I've received some documents that are HTML fragments generated from emails.
> The documents are clearly HTML, not emails, but the AutoDetectParser gives me
> the MIME type message/rfc822 and no text. I've attached an example.
> It looks like the presence of From:, Sent:, and Subject: at the beginning of
> lines is why the documents are matching RFC822. However, I believe the
> presence of HTML before these headers means the document is not valid RFC822.
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