CODEWITHSUNDEEP
tomcatopenlayersgeoserver
user1252188
user1252188

Reputation: 43

WFS-T xmlhttp post length limits?

After a long time searching and trying I'm asking now for help:

My situation:

My problem:

org.xml.sax.SAXParseException: An invalid XML character (Unicode: 0x0) was found in the element content of the document. An invalid XML character (Unicode: 0x0) was found in the element content of the document.

successful POST request

successful response

successful POST request headers

not successful POST request

not successful response

not successful POST request headers

my jsp-proxy

I'm very happy for any hint how to solve my problem!

Thanks in advance,

Cheers Hubert

Upvotes: 4

Views: 951

Answers (1)

elrado
elrado

Reputation: 5272

Better late than never :) Code below works for large geometries (at least for me)

Oh YEAH this is code for simple jsp proxy

<%@page session="false"%>
<%@page import="java.net.*,java.io.*" %>
<%@page trimDirectiveWhitespaces="true"%> 
<%

/**
 * This is a white list proxy that could be used the prevent an error due to 
 * JavaScript Same Origin Policy.
 * 
 * CAUTION: It might break some sites and it's a security risk because
 * people can use this proxy to browse the web and possibly do bad and/or illegal stuff
 * with it. 
 * It can load any content type.
 * This proxy implementation was inspired by the proxy.cgi script of OpenLayers
 * {@link http://openlayers.org}
 * To use this in OpenLayers you have to set OpenLayers.ProxyHost = "Url/To/This/Proxyfile/proxy.jsp?";
 * within your JavaScript code <br>
 * The base code of the proxy has been provided by SNIPPLR
 * {@link http://snipplr.com/view/17987/jsp-proxy-for-javascript-applications/}
 * 
 * @author terrestris GmbH & Co. KG
 * @author Christian Mayer
 * @author Marc Jansen
 * 
 * @license BSD see license.txt
 * 
 */
String[] allowedHosts = {
    "www.openlayers.org", "openlayers.org", 
    "labs.metacarta.com", "world.freemap.in", 
    "prototype.openmnnd.org", "geo.openplans.org",
    "sigma.openplans.org", "demo.opengeo.org",
    "www.openstreetmap.org", "sample.azavea.com",
    "v-swe.uni-muenster.de:8080", 
    "vmap0.tiles.osgeo.org",
    "192.168.197.95:8080"
};
HttpURLConnection con = null;
try {
    String reqUrl = request.getQueryString();
    String decodedUrl = "";
    if (reqUrl != null) {
        reqUrl = URLDecoder.decode(reqUrl, "UTF-8");
    }
    else {
        response.setStatus(400);
        out.println("ERROR 400: No target specified for proxy.");
    }

    // extract the host
    String host = "";
    host = reqUrl.split("\\/")[2];
    boolean allowed = false;

    // check if host (with port) is in white list
    for (String surl : allowedHosts) {
        if (host.equalsIgnoreCase(surl)) {
            allowed = true;
            break;
        }
    }

    // do the proxy action (load requested ressource and transport it to client)
    // if host is in white list
    if(allowed) {
        // replace the white spaces with plus in URL
        reqUrl = reqUrl.replaceAll(" ", "+"); 

        // call the requested ressource     
        URL url = new URL(reqUrl);
        con = (HttpURLConnection)url.openConnection();
        con.setDoOutput(true);
        con.setRequestMethod(request.getMethod());
        String reqContenType = request.getContentType();
        if(reqContenType != null) {
            con.setRequestProperty("Content-Type", reqContenType);
        }
        else {
            con.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        }

        int clength = request.getContentLength();
        if(clength > 0) {
            /* NOT WORKING FOR LARGE POST BODY
            con.setDoInput(true);
            byte[] idata = new byte[clength];
            request.getInputStream().read(idata, 0, clength);
            con.getOutputStream().write(idata, 0, clength); 
            */
            con.setDoInput(true);
            InputStream istream = request.getInputStream();
            OutputStream os = con.getOutputStream();
            final int length = 5000;
            byte[] bytes = new byte[length];
            int bytesRead = 0;
            while ((bytesRead = istream.read(bytes, 0, length)) > 0) {
                os.write(bytes, 0, bytesRead);
            }
        }

        // respond to client
        response.setContentType(con.getContentType());

        BufferedReader rd = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String line;
        int i = 0;
        while ((line = rd.readLine()) != null) {
            out.println(line);  
        }
        rd.close();
    }
    else {
        // deny access via HTTP status code 502
        response.setStatus(502);
        out.println("ERROR 502: This proxy does not allow you to access that location.");
    }

} catch(Exception e) {

    // resond an internal server error with the stacktrace
    // on exception
    response.setStatus(500);
    byte[] idata = new byte[5000];

    if(con.getErrorStream() != null) {
        con.getErrorStream().read(idata, 0, 5000);
    }

    out.println("ERROR 500: An internal server error occured. " + e.getMessage() + " " + new String(idata));    
}
%>

Upvotes: 1

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