NSURLResponse返回nil？

Question

我一直在使用NSURLConnection的sendAsynchronousRequest：queue：completionHandler：方法。但是，我無法得到迴應。每次httpResponse返回零。

NSString *str=@" http://maps.googleapis.com/maps/api/directions/json?origin=Bapunagar,%20Ahmedabad,%20Gujarat&destination=CG%20Road,%20Sattar%20Taluka%20Society,%20Usman%20Pura,%20Ahmedabad,%20Gujarat&sensor=false&units=metric&mode=transit&departure_time=1343605500&language=ar"; 
    str = [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; 

    NSURL * url = [NSURL URLWithString:str]; 
    NSURLRequest * request = [NSURLRequest requestWithURL:url]; 

    [NSURLConnection 
    sendAsynchronousRequest:request 
    queue:[[NSOperationQueue alloc] init] 
    completionHandler:^(NSURLResponse *response, 
         NSData *data, 
         NSError *error) 
    { 
     NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response; 
     NSLog(@"%@",httpResponse); 
     if ([data length] >0 && error == nil && [httpResponse statusCode] == 200) 
     { 
      NSDictionary * json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error]; 
      NSLog(@"%@",json); 

     }}]; 

這是什麼問題？ 幫助，請

Answer 1

你有兩個問題：

1. 您在這個網址的開頭的額外空間。刪除額外的空間。

2. 您打電話給stringByAddingPercentEscapesUsingEncoding已經被百分比轉義的URL。將此呼叫移除至stringByAddingPercentEscapesUsingEncoding。