     public func getCAPTCHA(iden: String, completion: (Result<CAPTCHAImage>) -> Void) throws -> NSURLSessionDataTask {
         guard let request = NSMutableURLRequest.mutableOAuthRequestWithBaseURL(baseURL, path:"/captcha/" + iden, method:"GET", token:token)
             else { throw ReddiftError.URLError.error }
-        let task = URLSession.dataTaskWithRequest(request, completionHandler: { (data: NSData?, response: NSURLResponse?, error: NSError?) -> Void in
-            self.updateRateLimitWithURLResponse(response)
-            let result = resultFromOptionalError(Response(data: data, urlResponse: response), optionalError:error)
+        let closure = {(data: NSData?, response: NSURLResponse?, error: NSError?) -> Result<CAPTCHAImage> in
+            return resultFromOptionalError(Response(data: data, urlResponse: response), optionalError:error)
                 .flatMap(response2Data)
                 .flatMap(data2Image)
-            completion(result)
-        })
-        task.resume()
-        return task
+        }
+        return executeTask(request, handleResponse: closure, completion: completion)
     }
     
     /**

        let parameter: [String:String] = ["api_type":"json"]
        guard let request = NSMutableURLRequest.mutableOAuthRequestWithBaseURL(baseURL, path:"/api/new_captcha", parameter:parameter, method:"POST", token:token)
            else { throw ReddiftError.URLError.error }
        let task = URLSession.dataTaskWithRequest(request, completionHandler: { (data: NSData?, response: NSURLResponse?, error: NSError?) -> Void in
            self.updateRateLimitWithURLResponse(response)
            let result = resultFromOptionalError(Response(data: data, urlResponse: response), optionalError:error)
                .flatMap(response2Data)
                .flatMap(data2Json)
                .flatMap(idenJSON2String)
            completion(result)
        })
        task.resume()
        return task
    }
    
    /**

    public func checkNeedsCAPTCHA(completion: (Result<Bool>) -> Void) throws -> NSURLSessionDataTask {
        guard let request = NSMutableURLRequest.mutableOAuthRequestWithBaseURL(baseURL, path:"/api/needs_captcha", method:"GET", token:token)
            else { throw ReddiftError.URLError.error }
        let closure = {(data: NSData?, response: NSURLResponse?, error: NSError?) -> Result<Bool> in
            return resultFromOptionalError(Response(data: data, urlResponse: response), optionalError:error)
                .flatMap(response2Data)
                .flatMap(data2Bool)
        }
        return executeTask(request, handleResponse: closure, completion: completion)
    }
    
    /**
