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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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Aha, changing the URL to dods:// worked, thanks! Jon On Dec 14, 2007 10:22 PM, John Caron <caron@xxxxxxxxxxxxxxxx> wrote: > ok, having actually read your message below, it appears that the opendap > call is failing, so the netcdf-java tries an HTTP request that needs the > getRange() capabity. to remove that possibility, change your URL from > http://etc to dods://etc. > > an error message may be coming out in your logs (if that is set up). you > might try following it in the debugger if you can and see why it fails. > also check that it really is succeeding in the ToolsUI at the exact time > its failing in you code. > > im at a conference so cant help much more till 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 > >>>> > >>>> > >> > >> > >> -- > >> -------------------------------------------------------------- > >> 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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