Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Due to the current gap in continued funding from the U.S. National Science Foundation (NSF), the NSF Unidata Program Center has temporarily paused most operations. See NSF Unidata Pause in Most Operations for details.
Further information on this: I can connect successfully to the server
in question using the toolsUI-2.2.22.jar, but I still can't via my own
application. I've had a quick look at the code for HttpClientManager
and HTTPRandomAccessFile and perhaps there is a call to
setDoAuthentication() missing?
Cheers, Jon
On Dec 13, 2007 9:12 PM, Jon Blower <jdb@xxxxxxxxxxxxxxxxxxxx> wrote:
> Thanks John, and everyone else who replied.
>
> I'm now experimenting with trying to get OPeNDAP authentication
> working in version 2.2.22. I have a very simple main() method that
> simply tries to open a NetcdfDataset from an OPeNDAP URL, where the
> OPeNDAP server requires authentication:
>
> public static void main(String[] args) throws Exception
> {
> HttpClientManager.init(new CredentialsProvider(){
> public Credentials getCredentials(AuthScheme scheme,
> String host, int port, boolean proxy)
> throws CredentialsNotAvailableException
> {
> System.out.println("Called Credentials Provider!");
> throw new CredentialsNotAvailableException();
> }
> }, null);
>
> NetcdfDataset nc = NetcdfDataset.openDataset("http://myurl";);
> nc.close();
> }
>
> When I run this I get an error message:
>
> Server does not support byte Ranges
> at
> ucar.unidata.io.http.HTTPRandomAccessFile.<init>(HTTPRandomAccessFile.java:99)
>
> which, having delved through the nj22 code, actually just means that
> the call to get the value of the Accept-Ranges header does not return
> what is expected. I assume that the real reason that the call fails
> is that the server requires authentication. The simple
> CredentialsProvider that I have written in the above code never gets
> called.
>
> Could anyone please shed some light on this, or perhaps provide a code
> snippet of the right way to go about this?
>
> Thanks very much,
> Jon
>
>
> On Nov 26, 2007 7:24 PM, John Caron <caron@xxxxxxxxxxxxxxxx> wrote:
> > Hi Jon:
> >
> > ucar.nc2.dataset.HttpClientManager is in 2.2.22 release. I beleive it was
> > added at 2.2.19.
> >
> >
> > Jon Blower wrote:
> > > Hi all,
> > >
> > > I'm trying to read data from an authenticated OPeNDAP server. I've
> > > found the page
> > > http://www.unidata.ucar.edu/software/netcdf-java/reference/HTTPauthentication.html,
> > > which says that I should create a CredentialsProvider and register it
> > > using ucar.nc2.dataset.HttpClientManager.init(). However, there is no
> > > class called HttpClientManager in the ucar.nc2.dataset package, or
> > > indeed anywhere in the nj22 distribution that I can see.
> > >
> > > What is the best way to read data from authenticated OPeNDAP servers?
> > > I am using nj22 version 2.2.16.
> > >
> > > Thanks, Jon
> > >
> >
>
>
>
>
> --
> --------------------------------------------------------------
> Dr Jon Blower Tel: +44 118 378 5213 (direct line)
> Technical Director Tel: +44 118 378 8741 (ESSC)
> Reading e-Science Centre Fax: +44 118 378 6413
> ESSC Email: jdb@xxxxxxxxxxxxxxxxxxxx
> University of Reading
> 3 Earley Gate
> Reading RG6 6AL, UK
> --------------------------------------------------------------
>
--
--------------------------------------------------------------
Dr Jon Blower Tel: +44 118 378 5213 (direct line)
Technical Director Tel: +44 118 378 8741 (ESSC)
Reading e-Science Centre Fax: +44 118 378 6413
ESSC Email: jdb@xxxxxxxxxxxxxxxxxxxx
University of Reading
3 Earley Gate
Reading RG6 6AL, UK
--------------------------------------------------------------
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