swift之NSURLErrorDomain 代码 = -1002 尽管转义了受限字符

我编写了以下请求代码(使用 SwiftHTTP 库)

func performTagRequest(detail : String){ 
    var request = HTTPTask() 
    var formattedDetail = detail.stringByReplacingOccurrencesOfString("\"", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil) 
    var url = "www.gifbase.com/tag/\(formattedDetail)?format=json" 
 
    url = url.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)! 
    println(url) 
    request.GET(url, parameters: nil, success: {(response: HTTPResponse) in 
    if response.responseObject != nil { 
        let data = response.responseObject as NSData 
        let str = NSString(data: data, encoding: NSUTF8StringEncoding)! 
        let gifMetaArray = str.componentsSeparatedByString(",") as [String] 
        //println("response: \(gifMetaArray))") //prints the HTML of the page 
    } 
    },failure: {(error: (NSError, HTTPResponse?)) in 
        println("error: \(error)") 
    }) 
} 

在浏览器中返回有效响应 (ex for "10thingsihateaboutyou") 但返回错误

error: (Error Domain=NSURLErrorDomain Code=-1002 "The operation couldn’t be completed.  
(NSURLErrorDomain error -1002.)" UserInfo=0x7ff22947b640  
{NSErrorFailingURLStringKey=www.gifbase.com/tag/10thingsihateaboutyou?format=json,  
NSUnderlyingError=0x7ff22940d550 "The operation couldn’t be completed. (kCFErrorDomainCFNetwork 
error -1002.)", NSErrorFailingURLKey=www.gifbase.com/tag/10thingsihateaboutyou?format=json}, nil) 

我发现错误 -1002 是 NSURLErrorUnsupportedURL 并且可能是由于未正确转义字符引起的，但我相信我的打印品上方的行应该这样做。

谁有这方面的经验？

请您参考如下方法:

我通过摆弄一些东西找到了答案。我忘记了“http://”，因为我被桌面浏览器宠坏了……