Asynchronous request timeout interval never stop

I have asynchronous request to send image to server with POST. I set timeoutInterval to 10seconds. If it sent image to 10 seconds, everything works good, but when user have worse internet connection, it should stop request after 10 seconds. But this request seems that it never stopped. Can you help?

- (void)postDataWithImage:(NSData *)imageData {

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@.%@",API_URL,self.method]]];
    [request setCachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData];
    [request setHTTPShouldHandleCookies:NO];
    [request setTimeoutInterval:10.0];
    [request setHTTPMethod:@"POST"];
    NSString *boundary = @"unique-consistent-string";

    // set Content-Type in HTTP header
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
    [request setValue:contentType forHTTPHeaderField: @"Content-Type"];

    // post body
    NSMutableData *body = [NSMutableData data];

    for (NSString *param in self.parametersDictionary) {
        [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=%@\r\n\r\n", param] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"%@\r\n", [self.parametersDictionary objectForKey:param]] dataUsingEncoding:NSUTF8StringEncoding]];
    }

    // add image data
    if (imageData) {
        [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=%@; filename=place.jpg\r\n", @"i"] dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
        [body appendData:imageData];
        [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    }

    [body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    // setting the body of the post to the reqeust
    [request setHTTPBody:body];

    // set the content-length
    NSString *postLength = [NSString stringWithFormat:@"%d", (int)[body length]];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    [NSURLConnection sendAsynchronousRequest:request queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
        dispatch_async(dispatch_get_main_queue(), ^(void){

        NSLog(@"Response %@",response);

        if ([data length] > 0) {
            NSLog(@"Success");
        } else {
            NSLog(@"Error"); // This never show me
        });

    }];

}

According to another question here on Stackoverflow, the default timeout for POST is 240 seconds and any shorter intervals are ignored.

Link to answer here