Bind Error

[Mone]

Hi,

could you check this demo: http://app.lightstreamer.com/_StockL...ple/index.html with your IE7?

Is this working?
Do you see some javascript exceptions?

[aps2007]

Hi,
I can access the url given in IE7.
Is it some configuration problem with my code
var lsPage = new PushPage();
//lsPage.context.setDebugAlertsOnClientError(false);
lsPage.context.setDomain("mycomp.co.in");
lsPage.onEngineCreation = startEngine;
lsPage.bind();
alert('create engine');
lsPage.createEngine("SLEngine", "ls/");
//starting subscribing first 15 stocks
changePage(1);

function startEngine(eng) {
eng.context.setDebugAlertsOnClientError(true);
eng.policy.setMaxBandwidth(30);
eng.policy.setIdleTimeout(30000);
eng.policy.setPollingInterval(1000);
eng.connection.setLSHost("mycomp.co.in");
eng.connection.setLSPort(9990);
eng.connection.setAdapterName("STOCKLISTDEMO");
eng.changeStatus("STREAMING");

[Mone]

Hi,

you are in a particular case where the domain set is equal to Lightstreamer host.
Please take a look at the documentation of the setDomain method, you will find some info there.

NOTE: I've deleted the application at http://app.lightstreamer.com/_StockL...ple/index.html

[aps2007]

Hi,

Changed the domain name to null.It works fine now.
Thanks

[Mone]

If you can you should change the hostname or the domain in a way that they look different.

eg:
domain - lightstreamer.com
LSHost - push.lightstreamer.com

this way you will see your app running on both IE and FX

[rd2008]

but in that case it says that domain and hosts are inconsistent. actually wht's meant by this domain and host. it confuses many times. specially in the case of deploying in two servers as external web server and light stream server. Can you please make a simple but detailed description of these two. Also can you please tell us how to create these host/domain in developer environment and production environment?

[DarioCrivelli]

The setting of "domain names" on the pages is imposed by the browsers, any time you need to allow pages coming from different hosts to see each other.
See http://en.wikipedia.org/wiki/Same_origin_policy, for instance.

Lightstreamer must cope with this limitation, because production front-ends based on Lightstreamer take pages from both a web server and Lightstreamer Server
and the Web Client Library just wraps the domain name setting through the "setDomain" method.

The general rule is that you must supply to "setDomain" a domain name such that both the web server host name and Lightstreamer Server host name are compatible with the chosen domain name, where:

• The web server host name is the one contained in the url by which you recall the pages.
• Lightstreamer Server host name is the name you supply to "setLSHost".

Obviously, if no domain name ensures compatibility with the required web server and Lightstreamer Server host names, then the front-end can't push.

The compatibility rules depend on the browsers.
I have no link to the complete rule; I hope someone who has could contribute. The most common case is that the xxx.yyy.zzz host name is compatible with the yyy.zzz domain name, but many special cases are also covered.
The web client library performs a preliminary check on the names supplied.
In your case, if you used a domain name and a LSHost which are consistent (as in the example by Simone), you might incur in an inconsistency between the domain name and the web server host name you used to recall your page from the browser.

There are no different rules for production and development environments.
However, there are cases that are not suitable for production but may be adopted for development if development environment limitations leave them as the only possible resort.
For instance in your development environment, the web server, Lightstreamer Server and test browser may all be on the same PC and no name of the form xxx.yyy.zzz may be available to access it, but only "localhost".
In this case, we suggest that you play with your "hosts" file in order to set dummy names for your PC;
but it turned out that you might also use "localhost" as LSHost and also recall the pages from "localhost", provided that you
either issue setDomain(null) and see the pages on an IE browser,
or issue setDomain("localhost") and see the pages on a FF browser.

[ctranfd]

Hello,

I've been reading some of the posts regarding bind errors - mostly around setting hostnames and domain names.

I've set up an web server + lightstreamer server on the same machine with:

web server domain name: mysite.com
lightstreamer server: lightstreamer.mysite.com
lightstreamer server port: 8090

I've managed to have a page served from the web server working on Firefox and Chrome, but I'm having trouble with IE6 and IE7 - I get the following error "ER bind Unable to find the Engine. Retrying. If the problem persists, please check your configuration."

This is what I've set up:


<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>mysite.com</title>
<script language="JavaScript" src="ls/lscommons.js"></script>
<script language="JavaScript" src="ls/lspushpage.js"></script>
</head>
<body>

<div class="fieldA" source="lightstreamer" table="mytable" item="theItem" field="fieldA">
LOADING...
</div>

<div class="fieldB"source="lightstreamer" table="mytable" item="theItem" field="fieldB">
LOADING...
</div>

<script type="text/javascript">

var page = new PushPage();
page.context.setDomain("mysite.com");
page.onEngineCreation = function(engine) {
engine.context.setDebugAlertsOnClientError(true);

engine.connection.setLSHost("lightstreamer.mysite. com");
engine.connection.setLSPort(8090);
engine.connection.setAdapterName("MYSITE");
engine.changeStatus("STREAMING");
}
page.bind();
page.createEngine("MySiteApp", "ls", "SHARE_SESSION");

var pushtable = new OverwriteTable(null, null, "MERGE");
pushtable.setPushedHtmlEnabled(true);
pushtable.setSnapshotRequired(true);
page.addTable(pushtable, "mytable");
</script>

</body>
</html>


From the JS API (http://www.lightstreamer.com/docs/cl...html#setDomain) - I've set the domain to be null for IE, but with no luck.

Just wondering if I'm missing something?

Many Thanks,

C

[Mone]

hi,

the problem with IE is that your web server is equal to your domain name.
you should extend your web server name to let the application run on IE:

web server: web.mysite.com
domain name: mysite.com
lightstreamer server: lightstreamer.mysite.com
lightstreamer server port: 8090

Hope that helps

[ctranfd]

Thanks! It worked

Just a note if anyone is testing this locally, I updated my hosts file with the 3 domains mentioned below.

127.0.0.1 mysite.com
127.0.0.1 web.mysite.com
127.0.0.1 lightstreamer.mysite.com