Bug #446 ยป net_httpheader_fetch_doc.patch
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end
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# Returns the header field corresponding to the case-insensitive key.
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# Returns the default value +args+, or the result of the block, or nil,
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# if there's no header field named key. See Hash#fetch
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# Returns the default value +args+, or the result of the block, or
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# raises an IndexErrror if there's no header field named +key+
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# See Hash#fetch
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def fetch(key, *args, &block) #:yield: +key+
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a = @header.fetch(key.downcase, *args, &block)
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a.join(', ')
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