AFNetworking上传图片，服务器接收不到

原来一直都没问题的，不知道什么原因从昨天开始就上传不了，没报错，但是服务器就是接收不到。。

+(void)uploadImgWithImgData:(NSData *)imgData loginName:(NSString *)loginName type:(NSString *)type idStr:(NSString *)idStr{
    NSDate *date = [NSDate date];
    NSString *dateStr = (NSString *)date;
    NSString *fileName = [NSString stringWithFormat:@"%@.jpg",dateStr];
    
    NSString *currentURL = @"/up/save";
    NSString *urlStr= [NSString stringWithFormat:@"%@%@?loginName=%@&type=%@&id=%@",UPLOADIMGBASEURL,currentURL,loginName,type,idStr] ;
    NSLog(@"urlstr:%@",urlStr);
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    [manager POST:urlStr parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        [formData appendPartWithFileData:imgData name:@"pic" fileName:fileName mimeType:@"image/jpeg"];
    } success:^(AFHTTPRequestOperation *operation, id responseObject) {
         NSLog(@"success:%@",responseObject);
        [Util showMsgSendFromServer:[responseObject objectForKey:@"msgs"]];
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"eerr:%@",error);
    }];
    
    
    
    
}

更新：在网上搜到这个

问一下怎么抓包？

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服务器是从 pic 字段读取文件的吗？