fix handling of multiple Content-type headers This can happen if an error happens while sending application/mercurial-0.1 content. The error page will be sent resulting (for at least lighttpd) in the following headers: Content-type: application/mercurial-0.1 Content-type: text/html which result in req.proto = 'application/mercurial-0.1, text/html' fix issue344

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# should print nothing

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# should print ? b/x

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? b/x

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# should print A b/x

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A b/x

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# should forget b/x

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forgetting b/x

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# should print nothing