无限循环请求 ajax 发送一会后 java web 服务器无响应，一篇空白 400 请求报错 

<script type="text/javascript">
            $(document).ready(function(){
            	 $("#btnallpublish").click(function(){
					
					var websitearray = new Array();
					
					
						websitearray[0] = ["1","腾讯网"];
					
						websitearray[1] = ["2","凤凰网"];
					
					
					for(var i=0; i < websitearray.length; i ++){
						$.ajax({
							  url: "/WebsiteServlet",
							  data: {method: "allchannel", id: websitearray[i][0] },
							  type: 'POST',
							  async: false,
							  cache: false,
							  dataType: "json",
							  success: function(data){
							  	 if(data.length == 0){
							  	 	return false;
							  	 }

							  	 
							   	 $.each(data, function(j, itemw) {
						            
						            $.ajax({
									  url: "/KeywordsServlet",
				 					  data: {method: "collection", websiteid: itemw.id },
									  type: 'POST',
									  async: false,
									  cache: false,
									  dataType: "json",
									  success: function(data2){
									  	 if(data2.length == 0){
									  	 	return false;
									  	 }

									  	 
									   	 $.each(data2, function(k, itemk) {
									   	 	var keyword = itemk.keyword;

								            $.ajax({
											  url: "/ArticleServlet",
											  data: {method: "collection", keyword: keyword, id: itemk.id, websiteid: itemk.websiteid, websiteid: itemk.websiteid },
											  type: 'POST',
											  async: false,
											  cache: false,
											  success: function(data3){
										         
									             $.ajax({
													  url: "/PublishServlet",
													  data: {method: "allpublish", keyword: keyword, websiteid: itemk.websiteid, channelid:itemw.channelid },
													  type: 'POST',
													  async: false,
													  cache: false,
													  success: function(data4){
													  },
													  error: function(XMLHttpRequest, textStatus, errorThrown) {
	
													  }
												});
												 
											  },
											  error: function(XMLHttpRequest, textStatus, errorThrown) {
		
											  }
											});
								        });
								        
									  },
									  error: function(XMLHttpRequest, textStatus, errorThrown) {
									  }
									});
						        });
						        
							  },
							  error: function(XMLHttpRequest, textStatus, errorThrown) {
							  }
							});
	            	 	 }
	            	 });
            });                           

        </script>

url: "/PublishServlet",