[Bug 2591] New: IcedTea-Web request resources twice for meta informations and causes ClientAbortException on tomcat in conjunction with JnlpDownloadServlet

[bugzilla-daemon at icedtea.classpath.org]

http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=2591

            Bug ID: 2591
           Summary: IcedTea-Web request resources twice for meta
                    informations and causes ClientAbortException on tomcat
                    in conjunction with JnlpDownloadServlet
           Product: IcedTea-Web
           Version: 1.5
          Hardware: x86_64
                OS: FreeBSD
            Status: NEW
          Severity: minor
          Priority: P5
         Component: NetX (javaws)
          Assignee: jvanek at redhat.com
          Reporter: lhersch at dssgmbh.de
                CC: unassigned at icedtea.classpath.org

In the method initializeResource(Resource resource) in
net/sourceforge/jnlp/cache/ResourceTracker.java
(net/sourceforge/jnlp/cache/ResourceDownloader.java in head) the method
findBestUrl(resource) will be called. This caused the first request for a
resource, normally a HEAD request. After that, back in initializeResource
connection.getContentLength() will be called. This caused a second request for
the same resource, but in this time a GET request. This GET-request caused a
ClientAbortException in the JnlpDownloadServlet, because the response body is
ignored.

The simplest solution to prevent the ClientAbortException, is to use a
HEAD-request for the second request.
A better solution is to save content-length and last-modified in findBestUrl,
so that the second request isn't necessary.

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