Have you seen this doc:
http://www.unidata.ucar.edu/software/netcdf-java/reference/HTTPauthentication.html
??
If so, then I probably need to add more info to it. Let me know and I
can look at it next week.
Jon Blower wrote:
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
--
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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
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