HTTP 403 Geoserver WPS Openlayers

Question

当我想请求WPS服务并且不知道如何解决此问题时，我一直收到错误HTTP 403。

这是我的xml执行请求：

<?xml version="1.0" encoding="UTF-8"?>
<wps:Execute version="1.0.0" service="WPS" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.opengis.net/wps/1.0.0" xmlns:wfs="http://www.opengis.net/wfs" xmlns:wps="http://www.opengis.net/wps/1.0.0" xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:gml="http://www.opengis.net/gml" xmlns:ogc="http://www.opengis.net/ogc" xmlns:wcs="http://www.opengis.net/wcs/1.1.1" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.opengis.net/wps/1.0.0 http://schemas.opengis.net/wps/1.0.0/wpsAll.xsd">
        <ows:Identifier>gs:Aggregate</ows:Identifier>
    <wps:DataInputs>
        <wps:Input>
            <ows:Identifier>features</ows:Identifier>
            <wps:Reference mimeType="text/xml" xlink:href="http://geoserver/wfs" method="POST">
                <wps:Body>
                    <wfs:GetFeature service="WFS" version="1.0.0" outputFormat="GML2" xmlns:sf="http://www.openplans.org/spearfish">
                        <wfs:Query typeName="topp:states"/>
                    </wfs:GetFeature>
                </wps:Body>
            </wps:Reference>
        </wps:Input>
        <wps:Input>
            <ows:Identifier>aggregationAttribute</ows:Identifier>
            <wps:Data>
                <wps:LiteralData>PERSONS</wps:LiteralData>
            </wps:Data>
        </wps:Input>
        <wps:Input>
            <ows:Identifier>function</ows:Identifier>
            <wps:Data>
                <wps:LiteralData>Count</wps:LiteralData>
            </wps:Data>
        </wps:Input>
        <wps:Input>
            <ows:Identifier>function</ows:Identifier>
            <wps:Data>
                <wps:LiteralData>Average</wps:LiteralData>
            </wps:Data>
        </wps:Input>
        <wps:Input>
            <ows:Identifier>function</ows:Identifier>
            <wps:Data>
                <wps:LiteralData>Sum</wps:LiteralData>
            </wps:Data>
        </wps:Input>
        <wps:Input>
            <ows:Identifier>function</ows:Identifier>
            <wps:Data>
                <wps:LiteralData>Min</wps:LiteralData>
            </wps:Data>
        </wps:Input>
        <wps:Input>
            <ows:Identifier>function</ows:Identifier>
            <wps:Data>
                <wps:LiteralData>Max</wps:LiteralData>
            </wps:Data>
        </wps:Input>
        <wps:Input>
            <ows:Identifier>singlePass</ows:Identifier>
            <wps:Data>
                <wps:LiteralData>false</wps:LiteralData>
            </wps:Data>
        </wps:Input>
    </wps:DataInputs>
    <wps:ResponseForm>
        <wps:RawDataOutput mimeType="application/json">
            <ows:Identifier>result</ows:Identifier>
        </wps:RawDataOutput>
    </wps:ResponseForm>
</wps:Execute>

然后我使用POST方法请求它。

 url = "http://localhost:8080/geoserver/wps";
    var req = new XMLHttpRequest();
    req.open("POST", url, true);
    req.setRequestHeader('Content-type', 'text/xml');
    req.onreadystatechange = function() {
        if (req.readyState != 4) return;
        if (req.status != 200 && req.status != 304) {
            alert('HTTP error ' + req.status);
            return;
        }
        alert(req.responseText);
        if (req.readyState == 4) {
            alert('Well done !');
        }return;
    };
    req.send(postData);