DWR

From Corneil du Plessis <corneilATtsctech.com>

The following seemed to work:

DWREngine._stateChange = function(batch) {
if (!batch.completed && batch.req.readyState == 4) {
try {
var reply = batch.req.responseText;
var status = batch.req.status;
switch (status) { case 200: // normal response handling break; case 12029: case 12030: case 12031: case 12152: case 12159: DWREngine._sendData(batch); window.status = "Retrying..."; return; break; default: DWREngine._handleMetaDataWarning(null, "Received an error code: " + batch.req.status); }
if (reply == null || reply == "") { DWREngine._handleMetaDataWarning(null, "No data received from server"); }
else {
var contentType = batch.req.getResponseHeader("Content-Type");
if (!contentType.match(/^text\/plain/) &&
!contentType.match(/^text\/javascript/)) {
if (DWREngine._textHtmlHandler &&
contentType.match(/^text\/html/)) { DWREngine._textHtmlHandler(); }
else { DWREngine._handleMetaDataWarning(null, "Invalid content type from server: '" + contentType + "'"); }
}
else {
if (reply.search("DWREngine._handle") == -1) { DWREngine._handleMetaDataWarning(null, "Invalid reply from server"); }
else { eval(reply); }
}
}

// We're done. Clear up
DWREngine._clearUp(batch);
}
catch (ex) { if (ex == null) ex = "Unknown error occured"; DWREngine._handleMetaDataWarning(null, ex); }
finally {
if (DWREngine._batchQueue.length != 0) { var sendbatch = DWREngine._batchQueue.shift(); DWREngine._sendData(sendbatch); DWREngine._batches[DWREngine._batches.length] = sendbatch; }
}
}
}

I also added this as part of my init.

DWREngine.setAsync(false);
DWREngine.setVerb("POST");

Hello,

I'm using DWR 1.1.4 within a RIA for Orange Business, Paris. Async is set to true, the verb is "POST".
This MSIE bug has been a real pain for us because we use mutualized reverse proxies with HTTP 1.1 + SSL + Keep-Alive enabled, and our clients use old MSIEs. We can't change our RP settings and we have had this bug (most often with codes 12030, 12151) so I tried your fix and it is not reliable, it seems to works randomly. Setting Async to true or false did not make any difference.

This seems to work better :
Add this into DWREngine._sendData() before sending the request :
batch.req.setRequestHeader("Connection", "close");

I find it elegant because it forces a new connection per DWR request, and the MSIE bug does not show up anymore.

As a warning to others, I just tried the following with DWR 2.0.3, which was suggested by C. Rufin above, and in IE 6 it caused all links in the browser to become unresponsive. DWR communication seemed to still work.

var dwrHeaders = new Object();
dwrHeaders['Connection'] = 'close';
dwr.engine.setHeaders(dwrHeaders);