IE11中來自GWT開放層的格式錯誤的WFS XMLHttpRequest

Question

我曾嘗試複製涉及WFS請求（this one）的GWT開放層展示示例之一。我不停的代碼，只是修改了它是一個簡單的組合，而不是一個抽象的例子，像這樣：

public class Example extends Composite { 

public Example() { 
    buildPanel(); 
} 

public void buildPanel() {   
    OpenLayers.setProxyHost("olproxy?targetURL=");   
    //create some MapOptions   
    MapOptions defaultMapOptions = new MapOptions();   
    defaultMapOptions.setNumZoomLevels(16);   
    MapWidget mapWidget = new MapWidget("500px", "500px", defaultMapOptions);   
    Map map = mapWidget.getMap();   
    WMSParams wmsParams = new WMSParams();   
    wmsParams.setFormat("image/png");   
    wmsParams.setLayers("topp:states");   
    wmsParams.setStyles("");   
    WMSOptions wmsLayerParams = new WMSOptions();  
    wmsLayerParams.setUntiled();   
    wmsLayerParams.setTransitionEffect(TransitionEffect.RESIZE); 
    String wmsUrl = "http://demo.opengeo.org/geoserver/wms";   
    WMS wmsLayer = new WMS("Basic WMS", wmsUrl, wmsParams, wmsLayerParams);   
    //Create a WFS layer   
    WFSProtocolOptions wfsProtocolOptions = new WFSProtocolOptions();   
    wfsProtocolOptions.setUrl("http://demo.opengeo.org/geoserver/wfs");  
    wfsProtocolOptions.setFeatureType("states");   
    wfsProtocolOptions.setFeatureNameSpace("http://www.openplans.org/topp");   
    //if your wms is in a different projection use wfsProtocolOptions.setSrsName(LAMBERT72);   
    WFSProtocol wfsProtocol = new WFSProtocol(wfsProtocolOptions);   
    VectorOptions vectorOptions = new VectorOptions();   
    vectorOptions.setProtocol(wfsProtocol);   
    vectorOptions.setStrategies(new Strategy[]{new BBoxStrategy()});   
    //if your wms is in a different projection use vectorOptions.setProjection(LAMBERT72);   
    final Vector wfsLayer = new Vector("wfsExample", vectorOptions);  
    wfsLayer.setFilter(new FeatureIdFilter(new String[]{"states.30"})); 
    //note that you can request the FID of a VectorFeature using getFID() 
    map.addLayer(wmsLayer);  
    map.addLayer(wfsLayer);  
    //Lets add some default controls to the map  
    map.addControl(new LayerSwitcher()); //+ sign in the upperright corner to display the layer switcher  
    map.addControl(new OverviewMap()); //+ sign in the lowerright to display the overviewmap 
    map.addControl(new ScaleLine()); //Display the scaleline  
    //Center and zoom to a location  
    map.setCenter(new LonLat(-100, 40), 4);   
    initWidget(mapWidget);  
    mapWidget.getElement().getFirstChildElement().getStyle().setZIndex(0); //force the map to fall behind popups 
} 
} 

我部署包含此面板我的GWT應用程序，並運行它在Internet Explorer 11使用的開發工具，我檢查了WFS XMLHttpRequest，要求使用指定的id的功能。 XML請求如下：

<wfs:GetFeature xmlns:wfs="http://www.opengis.net/wfs" service="WFS" version="1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.0.0/WFS-transaction.xsd"> 
<wfs:Query typeName="feature:states" xmlns:NS1="" NS1:xmlns:feature="http://www.openplans.org/topp"> 
    <ogc:Filter xmlns:ogc="http://www.opengis.net/ogc"> 
     <ogc:And> 
      <ogc:FeatureId fid="states.30" /> 
      <ogc:BBOX> 
       <ogc:PropertyName>the_geom</ogc:PropertyName> 
       <gml:Box xmlns:gml="http://www.opengis.net/gml" srsName="EPSG:4326"> 
        <gml:coordinates decimal="." cs="," ts=" ">-143.9453125,-3.9453125 -56.0546875,83.9453125</gml:coordinates> 
       </gml:Box> 
      </ogc:BBOX> 
     </ogc:And> 
    </ogc:Filter> 
</wfs:Query> 
</wfs:GetFeature> 

同一請求，始發從陳列櫃例如，是這樣的，而不是：

<wfs:GetFeature xmlns:wfs="http://www.opengis.net/wfs" service="WFS" version="1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.0.0/WFS-transaction.xsd"> 
<wfs:Query typeName="feature:states" xmlns:feature="http://www.openplans.org/topp"> 
    <ogc:Filter xmlns:ogc="http://www.opengis.net/ogc"> 
     <ogc:And> 
      <ogc:FeatureId fid="states.30"/> 
      <ogc:BBOX> 
       <ogc:PropertyName>the_geom</ogc:PropertyName> 
       <gml:Box xmlns:gml="http://www.opengis.net/gml" srsName="EPSG:4326"> 
        <gml:coordinates decimal="." cs="," ts=" ">-143.9453125,-3.9453125 -56.0546875,83.9453125</gml:coordinates> 
       </gml:Box> 
      </ogc:BBOX> 
     </ogc:And> 
    </ogc:Filter> 
</wfs:Query> 
</wfs:GetFeature> 

它們是相同的，除了用於該位第2行：。 ... xmlns：NS1 =「」NS1：xmlns：feature = ... 這是一個問題，因爲它使得我的請求無法被Geoserver解析（它說org.xml.sax.SAXParseException：屬性的值「prefix =」xmlns「，localpart =」ns1「，rawname =」xmlns：ns1「」無效。前綴名稱空間綁定可能不爲空）。 這似乎也發生在不同種類的WFS特徵過濾器（即邏輯）上。 此外，這隻發生在IE11上。在Firefox和Chrome上運行時請求已正確構建。我正在使用GWT 2.5.1和GWT-openlayers 1.0。
我需要使它工作，但我無法找出是什麼原因導致這種IE上的異常行爲...

Answer 1

這似乎是IE11中的一個已知錯誤。

來源：http://osgeo-org.1560.x6.nabble.com/WFS-and-IE-11-td5090636.html

解決方法是覆蓋OpenLayers.Format.XML.write方法與一種其去除一些流氓文本（作者：Stephen Battey與修改從krooole）：

var _class = OpenLayers.Format.XML; 
var originalWriteFunction = _class.prototype.write; 

var patchedWriteFunction = function() { 
    var child = originalWriteFunction.apply(this, arguments); 

    // NOTE: Remove the rogue namespaces as one block of text. 
    child = child.replace(new RegExp('xmlns:NS\\d+="" NS\\d+:', 'g'), ''); 

    return child; 
} 

_class.prototype.write = patchedWriteFunction; 

Answer 2

它是否工作，當你刪除以下行？

OpenLayers.setProxyHost("olproxy?targetURL=");