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Middleware to check for obedience to the WSGI specification.

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  - That HTTP_CONTENT_TYPE and HTTP_CONTENT_LENGTH are not in the
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  - Warns if QUERY_STRING is missing, as the cgi module acts
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  - That CGI-style variables (that don't contain a .) have
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  - That wsgi.version is a tuple

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  - Warns if the REQUEST_METHOD is not known (@@: probably too
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  - That SCRIPT_NAME and PATH_INFO are empty or start with /

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  - That wsgi.errors has the methods flush, write, writelines

* The status is a string, contains a space, starts with an integer,
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* That the headers is a list (not a subclass, not another kind of
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* That the items of the headers are tuples of strings.

* That there is no 'status' header (that is used in CGI, but not in
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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 no Content-Type is given when there is no content (@@: is this
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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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* That wsgi.input is used properly:

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* The response iterator:

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