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  - That wsgi.version is a tuple

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  - That SCRIPT_NAME and PATH_INFO are empty or start with /

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* That the headers is a list (not a subclass, not another kind of
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* That the headers don't contain newlines or colons, end in _ or -, or
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* That Content-Type is given if there is content (CGI often has a
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* That the exc_info argument to start_response is a tuple or None.

* That all calls to the writer are with strings, and no other methods
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