来自IE11中GWT-开层的格式错误的WFS XMLHttpRequest

Question

我已经尝试过复制一个GWT开放层示例，其中包括WFS (这一个)。我保留了代码，并将其修改为一个简单的组合，而不是抽象示例，如下所示：

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
}
}

我部署了包含此面板的GWT应用程序，并在Internet 11上运行它。使用开发人员工具，我检查了WFS XMLHttpRequest，它要求具有指定id的特性。XML请求如下：

<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>

来自展示示例的相同请求如下所示：

<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>

它们是一样的，除了第2行的这一点：.xmlns:NS1=“NS1：xmlns:feature=.这是一个问题，因为它使Geoserver无法解析我的请求(它说org.xml.sax.SAXParseException:属性“prefix=”xmlns、localpart="ns1“、rawname=”xmlns:ns1“的值无效。前缀命名空间绑定可能不是空的)。这似乎也发生在不同类型的WFS特性过滤器(即逻辑)上。而且，这只发生在IE11上。在Firefox和Chrome上运行时，这个请求是正确构建的。我使用的是GWT 2.5.1和GWT-openlayers 1.0。

我需要让它工作，但我找不出是什么原因造成这种反常行为的IE.

Answer 1

这似乎是IE11中的一个已知错误。

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

解决方法是用一个删除一些流氓文本的方法覆盖OpenLayers.Format.XML.write方法(作者：斯蒂芬·巴蒂，从克鲁中修改)：

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

删除以下行时，它是否有效？

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