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Filename/usr/lib64/python2.6/wsgiref/validate.pyc
Size16.51 kb
Permissionrw-r--r--
Ownerapache
Create time23-Dec-2025 17:41
Last modified20-Jun-2019 19:45
Last accessed22-Apr-2026 11:43
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Middleware to check for obedience to the WSGI specification.

Some of the things this checks:

* Signature of the application and start_response (including that
keyword arguments are not used).

* Environment checks:

- Environment is a dictionary (and not a subclass).

- That all the required keys are in the environment: REQUEST_METHOD,
SERVER_NAME, SERVER_PORT, wsgi.version, wsgi.input, wsgi.errors,
wsgi.multithread, wsgi.multiprocess, wsgi.run_once

- That HTTP_CONTENT_TYPE and HTTP_CONTENT_LENGTH are not in the
environment (these headers should appear as CONTENT_LENGTH and
CONTENT_TYPE).

- Warns if QUERY_STRING is missing, as the cgi module acts
unpredictably in that case.

- That CGI-style variables (that don't contain a .) have
(non-unicode) string values

- That wsgi.version is a tuple

- That wsgi.url_scheme is 'http' or 'https' (@@: is this too
restrictive?)

- Warns if the REQUEST_METHOD is not known (@@: probably too
restrictive).

- That SCRIPT_NAME and PATH_INFO are empty or start with /

- That at least one of SCRIPT_NAME or PATH_INFO are set.

- That CONTENT_LENGTH is a positive integer.

- That SCRIPT_NAME is not '/' (it should be '', and PATH_INFO should
be '/').

- That wsgi.input has the methods read, readline, readlines, and
__iter__

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

* The status is a string, contains a space, starts with an integer,
and that integer is in range (> 100).

* That the headers is a list (not a subclass, not another kind of
sequence).

* That the items of the headers are tuples of strings.

* That there is no 'status' header (that is used in CGI, but not in
WSGI).

* That the headers don't contain newlines or colons, end in _ or -, or
contain characters codes below 037.

* That Content-Type is given if there is content (CGI often has a
default content type, but WSGI does not).

* That no Content-Type is given when there is no content (@@: is this
too restrictive?)

* 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
on the writer are accessed.

* That wsgi.input is used properly:

- .read() is called with zero or one argument

- That it returns a string

- That readline, readlines, and __iter__ return strings

- That .close() is not called

- No other methods are provided

* That wsgi.errors is used properly:

- .write() and .writelines() is called with a string

- That .close() is not called, and no other methods are provided.

* The response iterator:

- That it is not a string (it should be a list of a single string; a
string will work, but perform horribly).

- That .next() returns a string

- That the iterator is not iterated over until start_response has
been called (that can signal either a server or application
error).

- That .close() is called (doesn't raise exception, only prints to
sys.stderr, because we only know it isn't called when the object
is garbage collected).
t validatoriÿÿÿÿN(tDictTypet
StringTypet TupleTypetListTypes^[a-zA-Z][a-zA-Z0-9\-_]*$s [\000-\037]t WSGIWarningcBseZdZRS(s:
Raised in response to WSGI-spec-related warnings
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When applied between a WSGI server and a WSGI application, this
middleware will check for WSGI compliancy on a number of levels.
This middleware does not modify the request or response in any
way, but will throw an AssertionError if anything seems off
(except for a failure to close the application iterator, which
will be printed to stderr -- there's no way to throw an exception
at that point).
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