Angular2 - 获取Observable ForkJoin

Question

我有一个可以包含多个HTTP请求的Angular2 ForkJoin。当ForkJoin出错时，我希望能够确定ForkJoin中导致错误的请求URL的子域/域。如果错误是401 Unauthorized，那么我需要尝试重新建立新连接。我需要失败请求的子域/域，以便我可以查找凭据以重新建立令牌，然后再次尝试ForkJoin请求。我的ForkJoin可能会向不同的域发出多个请求。

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			return Observable.create(observer => 
			{
				//JOIN ALL REQUESTS TOGETHER INTO A BATCH TO BE FORKED....
				let observableBatch = [];	

				//ADD OBSERVABLE FOR SINGLE GET REQUEST				
				if (requestModel.Get)
				{
					observableBatch.push(this.HttpGet(requestModel.Get));
				}	

				//ADD OBSERVABLE FOR AN ARRAY OF GET REQUESTS				
				if (requestModel.GetList)
				{
					for (let item in requestModel.GetList) 
					{
						observableBatch.push(this.HttpGet(requestModel.GetList[ item ]));
					}
				}	
								
				//ADD OBSERVABLE FOR SINGLE POST REQUEST	
				if (requestModel.Post)
				{
					observableBatch.push(this.HttpPost(requestModel.Post));
				}				
								
				//ADD OBSERVABLE FOR AN ARRAY OF POST REQUESTS
				if (requestModel.PostList)
				{
					for (let item in requestModel.PostList) 
					{
						observableBatch.push(this.HttpPost(requestModel.PostList[ item ]));
					}					
				}	
				
				/*
				FORK JOIN RETURNS AN ARRAY OF RESULT SETS (1 FOR EACH REQUEST IN FORK JOIN)
				THIS OBSERVABLE, IF SUCCESSFUL, RETURNS THE FOLLOWING:
				[1..N] - THE RAW JSON FROM CMS SERVICE
				*/
				let forkJoinSubscription = Observable.forkJoin(observableBatch)
					.subscribe (
						//SUCCESS, WE HAVE JSON RESPONSE(S)
						data =>
						{						
							console.log('FORK JOIN SUCCESS !!!', data);							
						},
					
						//ERROR
						err =>
						{
							console.log('FORK JOIN ERROR...', err);
						},

						//COMPLETE
						() =>
						{
							if (forkJoinSubscription)
							{ 
								forkJoinSubscription.unsubscribe();
							}							
							//console.log('FORK JOIN COMPELETED');
						}
				);			
			});

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发生错误时，是否可以在ForkJoin中的一批URL中确定URL的子域/域？