human
Solve the following python programming problem given the following code:
def __call__(self, environ, start_response) : 
    'Callable implementation for WSGI middleware.

        Args:
            environ (dict). a dictionary containing all WSGI environment properties for this request.

            start_response (func). a function used to store the status, HTTP headers to be sent to the client and optional exception information.

        Returns:
            (obj). the response to send back to the client.
        ' 
    start_time = datetime.datetime.utcnow () 
    name = (environ.get ('PATH_INFO') or '/') 
    closure = { 
        'status' : '200 OK', 
} 
    def status_interceptor(status_string, headers_array, exc_info = None) : 
        closure ['status'] = status_string 
        start_response (status_string, headers_array, exc_info) 
for part in self._wsgi_application (environ, status_interceptor) : 
        (yield part) 
success = True 
    response_match = re.match ('\\s*(?P<code>\\d+)', closure ['status']) 
    if response_match : 
        response_code = response_match.group ('code') 
        if (int (response_code) >= 400) : 
            success = False 
else : 
        response_code = closure ['status'] 
        success = False 
http_method = environ.get ('REQUEST_METHOD', 'GET') 
    url = name 
    query_string = environ.get ('QUERY_STRING') 
    if query_string : 
        url += ('?' + query_string) 
scheme = environ.get ('wsgi.url_scheme', 'http') 
    host = environ.get ('HTTP_HOST', environ.get ('SERVER_NAME', 'unknown')) 
    url = (((scheme + '://') + host) + url) 
    end_time = datetime.datetime.utcnow () 
    duration = int (((end_time - start_time).total_seconds () * 1000)) 
    self.client.track_request (start_response, url, success, (start_time.isoformat () + 'Z'), duration, response_code, http_method) 

    
    

    Fix the buggy line: self.client.track_request (start_response, url, success, (start_time.isoformat () + 'Z'), duration, response_code, http_method)
assistant
#Here is Python code to fix the buggy line: self.

self.client.track_request (name, url, success, (start_time.isoformat () + 'Z'), duration, response_code, http_method)