gevent pywsgi overflow

 def _do_read(self, length=None, use_readline=False):        if use_readline:            reader = self.rfile.readline        else:            reader = self.rfile.read        content_length = self.content_length        if content_length is None:            # Either Content-Length or "Transfer-Encoding: chunked" must be present in a request with a body            # if it was chunked, then this function would have not been called            return ''        self._send_100_continue()        left = content_length - self.position  // left = content_length

        if length is None:            length = left        elif length > left:            length = left        if not length:            return ''        read = reader(length)        self.position += len(read)        if len(read) < length:            if (use_readline and not read.endswith("\n")) or not use_readline:                raise IOError("unexpected end of file while reading request at position %s" % (self.position,))        return read

# if content_length > signed int, get error
# You cat inherit the Input class , give the size or length a default value
# you cat give left a value
if left > 2*1024*1024*1024:
left = 2*1024*1024*1024