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我在GWT中有一個可視化函數，它調用相同面板的兩個實例 - 兩個查詢。現在，假設一個網址是A而另一個網址是B。在這裏，我面臨的一個問題是，如果A首先被調用，那麼A和B的作品。如果B被稱爲第一個，那麼只有B工程，A - 超時。如果我同時撥打A，只有第一次A有效，第二次超時。如果我撥打B兩次，它兩次都可以順利進行。
即使錯誤發生時，它實際上不會超時 - 在FF狀態欄，它顯示直到 - 從A傳輸數據，然後它卡住了。這甚至不會在第一次查詢時顯示出來。
甲和乙之間的唯一區別是，乙回報非常快，而甲返回comparitively慢。
public Panel(){
Runnable onLoadCallback = new Runnable() {
public void run() {
Query query = Query.create(dataUrl);
query.setTimeout(60);
query.send(new Callback() {
public void onResponse(QueryResponse response) {
if (response.isError()){
Window.alert(response.getMessage());
}
}
}
}
VisualizationUtils.loadVisualizationApi(onLoadCallback, PieChart.PACKAGE);
}
什麼能這樣做的原因：
示例代碼如下？我想不出爲什麼會發生這種情況？爲什麼這隻發生在A而不是B？
編輯：更多研究。
所有時間都有效的查詢（即B是GWT可視化站點中給出的示例URL：請參見comment [1]）。所以，我在我的應用程序引擎試圖重現 - 以下方式
s = "google.visualization.Query.setResponse({version:'0.6',status:'ok',sig:'106459472',table:{cols:[{id:'A',label:'Source',type:'string',pattern:''},{id:'B',label:'Percent',type:'number',pattern:'#0.01%'}],rows:[{c:[{v:'Oil'},{v:0.37,f:'37.00%'}]},{c:[{v:'Coal'},{v:0.25,f:'25.00%'}]},{c:[{v:'Natural Gas'},{v:0.23,f:'23.00%'}]},{c:[{v:'Nuclear'},{v:0.06,f:'6.00%'}]},{c:[{v:'Biomass'},{v:0.04,f:'4.00%'}]},{c:[{v:'Hydro'},{v:0.03,f:'3.00%'}]},{c:[{v:'Solar Heat'},{v:0.005,f:'0.50%'}]},{c:[{v:'Wind'},{v:0.003,f:'0.30%'}]},{c:[{v:'Geothermal'},{v:0.002,f:'0.20%'}]},{c:[{v:'Biofuels'},{v:0.002,f:'0.20%'}]},{c:[{v:'Solar photovoltaic'},{v:4.0E-4,f:'0.04%'}]}]}});";
response = HttpResponse(s, content_type="text/plain; charset=utf-8")
response['Expires'] = time.strftime('%a, %d %b %Y %H:%M:%S GMT', time.gmtime())
return response
其中S爲數據，當我們運行查詢乙。我試圖添加Expires等，因爲這似乎是唯一的區別，但現在，查詢一直失敗。
欲瞭解更多信息 - 我現在發送我的服務器響應與工作服務器響應之間的差異。他們似乎很相似。
HTTP/1.0 200 OK
Content-Type: text/plain
Date: Wed, 16 Jun 2010 11:07:12 GMT
Server: Google Frontend
Cache-Control: private, x-gzip-ok=""
google.visualization.Query.setResponse({version:'0.6',status:'ok',sig:'106459472',table:{cols:[{id:'A',label:'Source',type:'string',pattern:''},{id:'B',label:'Percent',type:'number',pattern:'#0.01%'}],rows:[{c:[{v:'Oil'},{v:0.37,f:'37.00%'}]},{c:[{v:'Coal'},{v:0.25,f:'25.00%'}]},{c:[{v:'Natural Gas'},{v:0.23,f:'23.00%'}]},{c:[{v:'Nuclear'},{v:0.06,f:'6.00%'}]},{c:[{v:'Biomass'},{v:0.04,f:'4.00%'}]},{c:[{v:'Hydro'},{v:0.03,f:'3.00%'}]},{c:[{v:'Solar Heat'},{v:0.005,f:'0.50%'}]},{c:[{v:'Wind'},{v:0.003,f:'0.30%'}]},{c:[{v:'Geothermal'},{v:0.002,f:'0.20%'}]},{c:[{v:'Biofuels'},{v:0.002,f:'0.20%'}]},{c:[{v:'Solar photovoltaic'},{v:4.0E-4,f:'0.04%'}]}]}});Connection closed by foreign host.
Mac$ telnet spreadsheets.google.com 80
Trying 209.85.231.100...
Connected to spreadsheets.l.google.com.
Escape character is '^]'.
GET http://spreadsheets.google.com/tq?key=pWiorx-0l9mwIuwX5CbEALA&range=A1:B12&gid=0&headers=-1
HTTP/1.0 200 OK
Content-Type: text/plain; charset=UTF-8
Date: Wed, 16 Jun 2010 11:07:58 GMT
Expires: Wed, 16 Jun 2010 11:07:58 GMT
Cache-Control: private, max-age=0
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Server: GSE
google.visualization.Query.setResponse({version:'0.6',status:'ok',sig:'106459472',table:{cols:[{id:'A',label:'Source',type:'string',pattern:''},{id:'B',label:'Percent',type:'number',pattern:'#0.01%'}],rows:[{c:[{v:'Oil'},{v:0.37,f:'37.00%'}]},{c:[{v:'Coal'},{v:0.25,f:'25.00%'}]},{c:[{v:'Natural Gas'},{v:0.23,f:'23.00%'}]},{c:[{v:'Nuclear'},{v:0.06,f:'6.00%'}]},{c:[{v:'Biomass'},{v:0.04,f:'4.00%'}]},{c:[{v:'Hydro'},{v:0.03,f:'3.00%'}]},{c:[{v:'Solar Heat'},{v:0.005,f:'0.50%'}]},{c:[{v:'Wind'},{v:0.003,f:'0.30%'}]},{c:[{v:'Geothermal'},{v:0.002,f:'0.20%'}]},{c:[{v:'Biofuels'},{v:0.002,f:'0.20%'}]},{c:[{v:'Solar photovoltaic'},{v:4.0E-4,f:'0.04%'}]}]}});Connection closed by foreign host.
此外，請注意，應用程序引擎不允許過期頭部通過 - 這可能是原因嗎？但如果這是原因，那麼它應該不會失敗，如果B先發送然後A。
評論[1]：http://spreadsheets.google.com/tq?key=pWiorx-0l9mwIuwX5CbEALA&range=A1:B12&gid=0&headers=-1