Solr throws 400 from proxy but returns fine from browser.

[Mark Horninger]

Hi,

I am trying to work around a CORS issue on my app server side by standing up a 
proxy jsp in order to talk to Solr directly.  It's really just a request 
forwarder at this point in time.  The problem is that the same query I run 
through the proxy works fine through the browser, but when I run it in the 
proxy it always returns a 400.

I've tried to do some initial research, but I am coming up empty.  Can any one 
please shed some light on the situation?

Some code snippets:
JS XMLHTTPReq call:
var queryStr = '(Line1:Tom OR Line2:Tom OR Line3:Tom)';
...
var dataUrl = 'http://[snip!]:8983/solr/[snip!]/query?&q=' + queryStr + 
'&fl=Field0, Field1+, Line2, Line3, Line4, Line5, Line6, Line7, Field8, Field9, 
Field10 ...';

var strURL = 'proxy.jsp?dataUrl=' + encodeURIComponent(dataUrl);
    var xmlHttpReq = false;
    if (window.XMLHttpRequest) {
        xmlHttpReq = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
    }
    xmlHttpReq.open('GET', strURL, true);
    xmlHttpReq.setRequestHeader('Content-Type', 
'application/x-www-form-urlencoded');
    xmlHttpReq.onreadystatechange = function() {
        if (xmlHttpReq.readyState == 4) {
            var temp = xmlHttpReq.responseText;
            var refinedData = JSON.stringify(JSON.parse(temp).response.docs);

And the proxy call:
String dataUrl = request.getParameter("dataUrl");
      dataUrl = URLDecoder.decode(dataUrl);
      URL obj = new URL(dataUrl);
      HttpURLConnection con = (HttpURLConnection) obj.openConnection();

      // optional default is GET
      con.setRequestMethod("GET");
      con.setDoOutput(true);
      con.setRequestProperty("Accept", "application/json");

      int responseCode = con.getResponseCode();

I'm not sure why exactly this call is failing with a 400.  Any help that could 
be provided would be welcomed.

Thanks in advance!

-Mark
[GrayHair]
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