在目标c中将多部分/表单数据保存在服务器上，但获得500响应

Question

我尝试使用以下代码＆gt;在服务器上保存multipart / form-data;但不保存但Fiddler免费使用save进行调试以获得响应200。如何解决此问题

      NSMutableURLRequest * request=[[NSMutableURLRequest
        alloc]initWithURL:[NSURL URLWithString:jsonUrl]
        cachePolicy:NSURLRequestReloadIgnoringCacheData
        timeoutInterval:30.0];
 [request setHTTPMethod:@"POST"]; 
[request setValue:[NSString stringWithFormat:@"TPop %@",[Base64
        encode:[[[NSUserDefaults
        standardUserDefaults]objectForKey:@"AuthorizationID"]
        dataUsingEncoding:NSUTF8StringEncoding]]]
        forHTTPHeaderField:@"Authorization"];
      // set Content-Type in HTTP header 
NSString *BoundaryConstant = @"---------------------------acebdf13572468";
NSString *contentType= [NSString stringWithFormat:@"multipart/form-data; boundary=%@", BoundaryConstant];
 [request setValue:contentType forHTTPHeaderField:@"Content-Type"];

// post body 
NSMutableData *body = [NSMutableData data]; 
if (parameterArray!=nil) 
{ 
        NSMutableDictionary* _params = [[NSMutableDictionary alloc] init];
        [_params setObject:[NSString stringWithFormat:@"1"]forKey:[NSString
        stringWithFormat:@"SequencePosition"]]; 

[_params setObject:[NSString stringWithFormat:@"Image"]forKey:[NSString
        stringWithFormat:@"MediaType"]];
[_params setObject:[NSString
        stringWithFormat:@"Hello"]forKey:[NSString
        stringWithFormat:@"Description"]]; 
[_params setObject:[NSString
        stringWithFormat:@"car.jpg"]forKey:[NSString
        stringWithFormat:@"filename"]];
 for (NSString *param in _params) 
{
 [body appendData:[[NSString stringWithFormat:@"--%@\r\n",
        BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];
 [body appendData:[[NSString stringWithFormat:@"Content-Disposition:
        form-data; name=\"%@\"\r\n\r\n", param]
        dataUsingEncoding:NSUTF8StringEncoding]];
 [body appendData:[[NSString stringWithFormat:@"%@\r\n", [_params
        objectForKey:param]] dataUsingEncoding:NSUTF8StringEncoding]];

 } 
}
 UIImageView * imagicon=[[UIImageView
        alloc]init];
 imagicon.image=[UIImage imageNamed:@"car.jpg"]; 
NSData *image = UIImageJPEGRepresentation(imagicon.image,1.0); // add image data
 if (image) 
{
 NSString *filename=@"file";
 [body appendData:[[NSString stringWithFormat:@"--%@\r\n",
        BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];
 [body appendData:[[NSString
        stringWithFormat:@"Content-Disposition:form-data; name=\"%@\";
        filename=\"\"\r\n",filename]
        dataUsingEncoding:NSUTF8StringEncoding]];
 [body
        appendData:[@"Content-Type:image/jpeg\r\n\r\n"
        dataUsingEncoding:NSUTF8StringEncoding]];
 [body appendData:image];
        [body appendData:[[NSString stringWithFormat:@"\r\n"]
        dataUsingEncoding:NSUTF8StringEncoding]];
 } [body
        appendData:[[NSString stringWithFormat:@"--%@--\r\n",
        BoundaryConstant] dataUsingEncoding:NSUTF8StringEncoding]];
 [request
        setHTTPBody:body]; 
NSURLResponse* response; NSLog(@"%@",request);
        NSError* error = nil;
 //Capturing server response 
NSData* result =
        [NSURLConnection sendSynchronousRequest:request
        returningResponse:&response error:&error]; 
NSLog(@"%@",response);
        NSLog(@"%@",error); 
NSString *responseString = [[NSString alloc]
        initWithData:result encoding:NSUTF8StringEncoding];
 }
 }

获得以下服务器响应

  

{status code：500，headers {＆＃34; Cache-Control＆＃34; =＆＃34; no-cache＆＃34 ;;   ＆＃34; Content-Length的＆＃34; = 35; ＆＃34;内容类型＆＃34; =＆＃34; application / json;   字符集= UTF-8＆＃34 ;;日期=＆＃34;星期五，2015年7月31日15:51:01 GMT＆＃34 ;;到期=   ＆＃34; -1＆＃34 ;; Pragma =＆＃34; no-cache＆＃34 ;; Server =＆＃34; Microsoft-IIS / 8.5＆＃34 ;;   ＆＃34; X-ASPNET-版＆＃34; =＆＃34; 4.0.30319＆＃34 ;; ＆＃34; X供电-通过＆＃34; =＆＃34; ASP.NET＆＃34 ;; }}

如何解决这个问题...