human
Solve the following python programming problem given the following code:
def __call__(self, environ, start_response) : 
    response = { 
        'status' : '200 OK', 
        'headers' : [], 
} 
    def json_start_response(status, headers) : 
        response ['status'] = status 
        response ['headers'].extend (headers) 
environ ['jsonfilter.mime_type'] = self.mime_type 
    if (environ.get ('REQUEST_METHOD', '') == 'POST') : 
        if (environ.get ('CONTENT_TYPE', '') == self.mime_type) : 
            args = [_ for _ in [environ.get ('CONTENT_LENGTH')] if _] 
            data = environ ['wsgi.input'].read (* map (int, args)) 
            environ ['jsonfilter.json'] = simplejson.loads (data) 
res = simplejson.dumps (self.app (environ, json_start_response)) 
    jsonp = cgi.parse_qs (environ.get ('QUERY_STRING', '')).get ('jsonp') 
    if jsonp : 
        content_type = 'text/javascript' 
        res = ''.join ((jsonp + ['(', res, ')'])) 
else : 
        if ('Opera' in environ.get ('HTTP_USER_AGENT', '')) : 
            content_type = 'text/plain' 
else : 
            content_type = self.mime_type 
headers = [('Content-type', args), ('Content-length', len (res))] 
    headers.extend (response ['headers']) 
    start_response (response ['status'], headers) 
    return [res] 

    
    

    Fix the buggy line: headers = [('Content-type', args), ('Content-length', len (res))]
assistant
#Here is Python code to fix the buggy line: headers = [('Content-type', args), ('Content-length', len (res))]
.

headers = [('Content-type', content_type), ('Content-length', len (res))]