[issue25570] urllib.request > Request.add_header("abcd", "efgh") fails with character ":" in first parameter string

[Martin Panter]

Martin Panter added the comment:

Sorry, it seems I missed some updates to this bug.

I think the docs have enough big red warning boxes. But an explanation or short example might be good.

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stage:  -> needs patch

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<http://bugs.python.org/issue25570>
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