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我在GWT中有一个可视化函数，它调用相同面板的两个实例 - 两个查询。现在，假设一个网址是A而另一个网址是B。在这里，我面临的一个问题是，如果A首先被调用，那么A和B的作品。如果B被称为第一个，那么只有B工程，A - 超时。如果我同时拨打A，只有第一次A有效，第二次超时。如果我拨打B两次，它两次都可以顺利进行。
即使错误发生时，它实际上不会超时 - 在FF状态栏，它显示直到 - 从A传输数据，然后它卡住了。这甚至不会在第一次查询时显示出来。
甲和乙之间的唯一区别是，乙回报非常快，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);
}
什么能这样做的原因：
示例代码如下？我想不出为什么会发生这种情况？为什么这只发生在A而不是B？
编辑：更多研究。
所有时间都有效的查询（即B是GWT可视化站点中给出的示例URL：请参见comment [1]）。所以，我在我的应用程序引擎试图重现 - 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为数据，当我们运行查询乙。我试图添加Expires等，因为这似乎是唯一的区别，但现在，查询一直失败。
欲了解更多信息 - 我现在发送我的服务器响应与工作服务器响应之间的差异。他们似乎很相似。
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，请注意，应用程序引擎不允许过期头部通过 - 这可能是原因吗？但如果这是原因，那么它应该不会失败，如果B先发送然后A。
评论[1]：http://spreadsheets.google.com/tq?key=pWiorx-0l9mwIuwX5CbEALA&range=A1:B12&gid=0&headers=-1