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Re: [netcdf-java] Getting a NetcdfFile object from a dods url

the url part is fine. The issue has to do with url escaping
and especially with escaping of the constraint.
For those of you running non-tds servers, the question is:
do you unescape the query part or not upon receiving the
incoming url.


Roland Schweitzer wrote:

On 10/03/2011 03:37 AM, Raymond Cramer wrote:
I am having a similar problem. From a browser I can return ASCII data, so the 
OPeNDAP is working.
http://...../thredds/dodsC/vault/..._cf.nc.ascii?crs,depth[3599:1:3719][19199:1:19319]
If I try to access this through code, using http my log file fills up with msgs which suggests I can't use http (or something else needs setting ;-)):
I believe that the only way to do this via the Java API is to open the unconstrained URL (http://...../thredds/dodsC/vault/..._cf.nc) and then use the API to request the hyperslab you want rather than trying to open the constrained URL. 

Roland


Exception
http://....:8080/thredds/dodsC/vault/...._cf.nc?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319] 
java.lang.IllegalArgumentException: Invalid uri
'http://....:8080/thredds/dodsC/vault/...._cf.nc?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319]': 
Invalid query
    at
org.apache.commons.httpclient.HttpMethodBase.<init>(HttpMethodBase.java:222) 
    at
org.apache.commons.httpclient.methods.HeadMethod.<init>(HeadMethod.java:94) 
    at
ucar.unidata.io.http.HTTPRandomAccessFile.<init>(HTTPRandomAccessFile.java:92) 
    at
ucar.unidata.io.http.HTTPRandomAccessFile.<init>(HTTPRandomAccessFile.java:78) 
    at ucar.nc2.NetcdfFile.getRaf(NetcdfFile.java:300)
    at ucar.nc2.NetcdfFile.open(NetcdfFile.java:281)
    at ucar.nc2.dataset.NetcdfDataset.openFile(NetcdfDataset.java:335)
    at ucar.nc2.dataset.NetcdfDataset.openFile(NetcdfDataset.java:280)
    ...
If I try to use dods, I get a lot more msgs, it accesses the file, outputs the header data but fails on the data (when the call becomes http again for 
the DAS?):
[org.apache.commons.httpclient.HttpMethodBase] Resorting to protocol version 
default close connection policy
[org.apache.commons.httpclient.HttpMethodBase] Should NOT close connection, 
using HTTP/1.1
[org.apache.commons.httpclient.HttpConnection] enter
HttpConnection.isResponseAvailable()
[org.apache.commons.httpclient.HttpConnection] enter
HttpConnection.releaseConnection()
[org.apache.commons.httpclient.HttpConnection] Releasing connection back to 
connection manager.
[org.apache.commons.httpclient.MultiThreadedHttpConnectionManager] enter
HttpConnectionManager.releaseConnection(HttpConnection)
[org.apache.commons.httpclient.MultiThreadedHttpConnectionManager] Freeing 
connection, hostConfig=HostConfiguration[host=http://....:8080]
[org.apache.commons.httpclient.MultiThreadedHttpConnectionManager] enter
HttpConnectionManager.ConnectionPool.getHostPool(HostConfiguration)
[org.apache.commons.httpclient.util.IdleConnectionHandler] Adding connection 
at: ........
[org.apache.commons.httpclient.MultiThreadedHttpConnectionManager] Notifying 
no-one, there are no waiting threads
[ucar.nc2.dods.DODSNetcdfFile] DODSNetcdfFile
dods://....:8080/thredds/dodsC/vault/...._cf.nc?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319] 
java.lang.IllegalArgumentException: Invalid uri
'http://....:8080/thredds/dodsC/vault/...._cf.nc.das?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319]': 
Invalid query
    at
org.apache.commons.httpclient.HttpMethodBase.<init>(HttpMethodBase.java:222) 
    at
org.apache.commons.httpclient.methods.GetMethod.<init>(GetMethod.java:89)
    at opendap.dap.DConnect2.openConnection(DConnect2.java:205)
    at opendap.dap.DConnect2.getDAS(DConnect2.java:399)
    at ucar.nc2.dods.DODSNetcdfFile.<init>(DODSNetcdfFile.java:186)
    at ucar.nc2.dataset.NetcdfDataset.openDODS(NetcdfDataset.java:379)
    at ucar.nc2.dataset.NetcdfDataset.openFile(NetcdfDataset.java:316)
    at ucar.nc2.dataset.NetcdfDataset.openFile(NetcdfDataset.java:280)
       .....
ERROR [uk.ac.bodc.Netcdf_Utils] trying to open
dods://....:8080/thredds/dodsC/vault/...._cf.nc?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319] 
java.io.FileNotFoundException: Cant open
dods://....:8080/thredds/dodsC/vault/...._cf.nc?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319] 
or as DODS
dods://....:8080/thredds/dodsC/vault/...._cf.nc?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319] 
Invalid uri
'http://....:8080/thredds/dodsC/vault/...._cf.nc.das?crs,depth[3600:1:3719][19200:1:19319],lat[3600:1:3719],lon[19200:1:19319]': 
Invalid query
    at ucar.nc2.dataset.NetcdfDataset.openDODS(NetcdfDataset.java:381)
    at ucar.nc2.dataset.NetcdfDataset.openFile(NetcdfDataset.java:316)
    at ucar.nc2.dataset.NetcdfDataset.openFile(NetcdfDataset.java:280)
       ....

I am accessing this through inFile = NetcdfDataset.openFile(inFileName,
null);

I hope I haven't broken any rules for the length of this msg, hopefully
there's sufficient info that someone recognises the problem.

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