Fixed #14602 -- Added an extra check to wsgi.input handling to prevent...

        self.META['SCRIPT_NAME'] = script_name

        self.method = environ['REQUEST_METHOD'].upper()

        self._post_parse_error = False

        if isinstance(self.environ['wsgi.input'], socket._fileobject):

        if type(socket._fileobject) is type and isinstance(self.environ['wsgi.input'], socket._fileobject):

            # Under development server 'wsgi.input' is an instance of

            # socket._fileobject which hangs indefinitely on reading bytes past

            # available count. To prevent this it's wrapped in LimitedStream

            # streams) beacuse they don't suffer from this problem and we can

            # avoid using another wrapper with its own .read and .readline

            # implementation.

            #

            # The type check is done because for some reason, AppEngine

            # implements _fileobject as a function, not a class.

            try:

                content_length = int(self.environ.get('CONTENT_LENGTH', 0))

            except (ValueError, TypeError):