下载Facebook视频（没有用户访问令牌）

Question

尝试获取Facebook视频数据（视频网址，缩略图，desc等...）

Facebook返回错误＆＃34;访问令牌＆＃34;

• 视频是公开的

  url_str = @"https://www.facebook.com/DonaldTrump/videos/vb.153080620724/10159664271045725/?type=2&theater";
  
  
  
  
  FBSDKGraphRequest *request = [[FBSDKGraphRequest alloc]
                                initWithGraphPath:[NSString stringWithFormat:@"%@",url_str]
                                parameters:@{@"fields": @"id, source,picture"}
                                HTTPMethod:@"GET"];
  [request startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection,
                                        NSDictionary* result,
                                        NSError *error) {
  
  
      if(result){
  
      }
      else{
  
      }
  
  
  
  }];
  

错误消息：

   body =     {
        error =         {
            code = 104;
            "fbtrace_id" = G2cJAV2mSlS;
            message = "An access token is required to request this resource.";
            type = OAuthException;
        };
    };
    code = 400;