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https://issues.apache.org/jira/browse/TIKA-3710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17539574#comment-17539574
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Tim Allison commented on TIKA-3710:
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Sorry, that comment must have referred to the patterns in that block that
allowed content before the html tags. The patterns currently require the
{{<h1}} etc as the first character. We could move the patterns that require a
match as the first character to a different block with a higher priority?
>Is it valid for a message/rfc822 message to have a bunch of preamble like the
>HTML tags in my document before the headers?
My memory is that we've seen some crazy headers before the usual rfc822
headers. I do not think we've seen html tags in those.
> 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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