iphone - リクエストの形式が無効です: text/xml; 文字セット=utf-8

Question

iphone開発初心者です。

iPhoneアプリケーションからNSSTRINGをサーバーに送信しようとしています。

次のコード行で

NSString *soapMessage = [NSString stringWithFormat:
                             @"<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
                             "<soap12:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap12=\"http://schemas.xmlsoap.org/soap/envelope/\">\n"
                             "<soap12:Body>\n"
                             "<SaveData xmlns=\"http://tempuri.org/\">\n"
                             "<xmlstring>%@</xmlstring>\n"
                             "</SaveData>\n"
                             "</soap12:Body>\n"
                             "</soap12:Envelope>\n", StringXml
                             ];
    NSLog(@"Soap Messaage......%@",soapMessage);

    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
    NSString *msgLength = [NSString stringWithFormat:@"%d", [soapMessage length]];

    [theRequest addValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [theRequest addValue: @"http://tempuri.org/SaveData" forHTTPHeaderField:@"SOAPAction"];
    [theRequest addValue: msgLength forHTTPHeaderField:@"Content-Length"];
   // [theRequest addValue: StringXml forHTTPHeaderField:@"xmlstring"];
    [theRequest setHTTPMethod:@"POST"];
    [theRequest setHTTPBody: [soapMessage dataUsingEncoding:NSUTF8StringEncoding]];
    //[theRequest setHTTPBody: [StringXml dataUsingEncoding:NSUTF8StringEncoding]];

    NSURLConnection *connectionResponse = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];

しかし、それは私を返します

すなわち

System.InvalidOperationException: 要求の形式が無効です: text/xml; 文字セット=utf-8。System.Web.Services.Protocols.HttpServerProtocol.ReadParameters() で System.Web.Services.Protocols.WebServiceHandler.CoreProcessRequest() で

この問題を克服するにはどうすればよいですか？