iOS Calling Web Service不適用於4g

Question

我正在編寫一個調用JSON Web服務的應用程序。 當iPhone連接到WiFi網絡時，它可以正常工作。 但是，當它使用蜂窩數據網絡時，它不起作用。 我收到[NSJSONSerialization JSONObjectWithData：數據選項：kNilOptions錯誤：＆錯誤]返回的錯誤。 這是我的代碼：

-(BOOL) CallService {
    NSError *error;
    NSData *paramData = [NSJSONSerialization dataWithJSONObject:self.parameter    options:kNilOptions error:&error];

    NSString *serviceUrl = [[NSString alloc] initWithFormat:@"%@%@", self.webHost, self.serviceName];
    NSURL *url = [NSURL URLWithString:serviceUrl];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"POST"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:@"json" forHTTPHeaderField:@"Data-Type"];
    [request setValue:[NSString stringWithFormat:@"%d", [paramData length]]  forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody:paramData];
    NSError *errorReturned = nil;
    NSURLResponse *theResponse =[[NSURLResponse alloc]init];
    NSData *data = [NSURLConnection sendSynchronousRequest:request
                                         returningResponse:&theResponse
                                                     error:&errorReturned];

    BOOL retVal = FALSE;

    if (errorReturned){
        //...handle the error
        NSLog(@"%@", errorReturned.description);
    }
    else {
        self.serviceResult = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
        NSLog(@"%@", error);
        retVal = (BOOL)[self.serviceResult objectForKey:@"Success"];
    }

    return retVal;
}

並且返回的錯誤是：

purgeIdleCellConnections: found one to purge conn = 0x1d04d710
2012-11-07 20:17:43.776 iPressBoxx-iPhone[733:907] 
Error Domain=NSCocoaErrorDomain 
Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" 
(JSON text did not start with array or object and option to allow fragments not set.)
 UserInfo=0x1d04eff0 {NSDebugDescription=JSON text did not start with array or object and option to allow fragments not set.}

Answer 1

對我來說聽起來像你是JSON編碼的數據或結果混淆了。

這里最好的選擇是打印出所有原始數據或使用像Charles Proxy（ http://charlesproxy.com ）這樣的內容攔截網絡請求，看看發生了什么。