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Networking problem with BIRT generated resource URLs

abhiii

BIRT is generating resource URLs using the internal(to our network) name of the machine that is serving the request.
For example,
mymachine1.internaldomain:8080/reports/webcontent/birt/ajax/utility/BrowserUtility.js

Of course mymachine1.internaldomain has no meaning outside our network so the calls to load resources from outside our network fail.

Is there a way of setting the domain in config somehow? Then it would generate something like ...
mymachine1.usableexternaldomain:8080/reports/webcontent/birt/ajax/utility/BrowserUtility.js

Also, does the request need to be rerouted to the same machine?

We are using plain vanilla BIRT runtime on Tomcat.
Ubuntu 10.4
BIRT 2.6.1
Tomcat 6.0.29

This is our first BIRT deployment and we have discovered the issue very late so your help is really appreciated.

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Comments

JasonW

The domain is not settable in BIRT. This seems more like a dns issue? The viewer is deployed relative. So if you have an external ip for the machine it should be something like http://externalip:8080/reports.

Jason

abhiii

Thanks for your quick response.
The reporting machines don't have an external name/IP. The requests are proxied to the internal server. The URL for the main reporting page with links to the individual reports is http://mymainsite.com/reports. The link is http:// mymainsite.com/reports/show/MyReport. This gets proxied to the right server and port 8080 for Tomcat with frameset?__report=report/MyReport.rptdesign. This serves the main page correctly but all the resource links are generated for the internal name of the machine which has no meaning outside the firewall so the report is broken. This is not a dns problem really and would work if we had control over the generated resource links.
Pity there is no quick configurable was to do what we want. I am wondering how other users have handled the issue. I suppose it occurs infrequently since most reporting is internal to a company rather than externally accessible.

JasonW

I know the framsetfragment.jsp page includes the js files relative.
<script src="birt/ajax/utility/BrowserUtility.js" type="text/javascript"></script>
I would have thought this would have come through the proxy. I am pretty sure there are others proxying the viewer.

Jason

abhiii

The issue is coming from the host name. Any idea how this is obtained? It does not seem to be from the servlet request as there seems to be no request.getRequestURL( ) in the source. I couldn't find any relevant references to InetAddress to acquire the hostname either.

JasonW

What are you using to proxy the app?

Jason

abhiii

Not exactly sure(sysads are away right now) but incoming requests are mapped either by the firewall or Apache.

JasonW

I did a quick test with apache 2 in proxy mode as described here:
http://tomcat.apache.org/tomcat-5.5-doc/proxy-howto.html

and if the connector element in tomcat is not configured correctly I get the same error as you. I changed the connector element and it worked fine. BTW the code below sets up the references. It is in the FramesetFragment.jsp. Specifically look how BASE href is generated.

<%
// base href can be defined in config file for deployment.
String baseHref = request.getScheme( ) + "://" + request.getServerName( ) + ":" + request.getServerPort( );
if( !attributeBean.isDesigner( ) )
{
String baseURL = ParameterAccessor.getBaseURL( );
if( baseURL != null )
baseHref = baseURL;
}
baseHref += request.getContextPath( ) + fragment.getJSPRootPath( );
%>

<%

Viewer root fragment

%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/REC-html40/strict.dtd">
<HTML>
<HEAD>
<TITLE><%= attributeBean.getReportTitle( ) %></TITLE>
<BASE href="<%= baseHref %>" >

My connector looks like:
<Connector className="org.apache.catalina.connector.http.HttpConnector"
port="8091"
proxyName="localhost"
proxyPort="80"/>
You need to change proxyName to your external site I believe.

Jason

abhiii

Thanks, that works! One outstanding mystery; in FramesetFragment.jsp, just before baseHref is declared there is a comment ...

"// base href can be defined in config file for deployment."

Is this just old cruft or can you really set baseHref in a config file?

Thanks again, saved my hide.

JasonW

Yes you can set it in the viewer.properties file:

base_url=yourbaseurl

The viewer.properites file is the default config file, but you can change it in the web.xml.

Jason