Hi Dave, > It sounds (from an email that you sent after the one above) that you > are seeing the same behavior on Unidata's server as I see on mine. > Below is a sample of the type of error I'm getting anyway. It occurs > when I try to access NOAA MADIS UrbaNet point data in NetCDF format: > http://funnel.sfsu.edu/data/LDAD/urbanet/200806010_1200.nc > > Note that the error occurs AFTER I added the entry below to the > httpd.conf file and restarted the Web server: > > <Directory "/opt/local_htdocs"> > Options FollowSymLinks Indexes > AllowOverride None > Order allow,deny > Allow from all > Header set Accept-Ranges bytes > </Directory> > > (There's no Content-Length specification; I see from a later email > that you're wondering whether that matters or not, too.) > > In contrast, I don't have any problem reading and plotting the same > data as a local file (from the same server) (see attached JPEG). > > -- Dave Well, I'm back to thinking that Apache by default will do byte range subsetting. Below is what I see if I telnet to your web server and construct a byte range request by hand. The request is just three lines of text: GET /data/LDAD/urbanet/20080610_1200.nc HTTP/1.1 HOST: funnel.sfsu.edu Range: bytes=0-2000 followed by two blank lines and indicates it only wants the first 2001 bytes of the file. The result is a 206 Partial Content which is what we would expect and it looks like the response breaks in the middle (I snipped out a bunch of stuff). When I try the URL (http://funnel.sfsu.edu/data/LDAD/urbanet/20080610_1200.nc) in the netCDF-Java 4.0 ToolsUI, it opens it just fine. It also opens fine in the netCDF-Java 2.2 ToolsUI (which should be the same underlying netCDF-Java library the IDV is using). However, for the dataset URL http://www.unidata.ucar.edu/software/netcdf-java/testdata/20010721.nc, I can telnet to the unidata web server and can get a byte range but it fails in netCDF-Java ToolsUI with the exception shown below. So, I think something other than byte range problems is going on here. John, any ideas? Ethan --------------------------------------------------------------------------- zero.unidata.ucar.edu: telnet funnel.sfsu.edu 80 Trying 220.127.116.11... Connected to funnel.sfsu.edu. Escape character is '^]'. GET /data/LDAD/urbanet/20080610_1200.nc HTTP/1.1 HOST: funnel.sfsu.edu Range: bytes=0-2000 HTTP/1.1 206 Partial Content Date: Thu, 12 Jun 2008 20:11:03 GMT Server: Apache/2.2.8 (Unix) mod_ssl/2.2.8 OpenSSL/0.9.7l DAV/2 PHP/5.2.5 Last-Modified: Tue, 10 Jun 2008 14:19:39 GMT ETag: "5e9620-96c41c-44f509e5214c0" Accept-Ranges: bytes Content-Length: 2001 MS-Author-Via: DAV Content-Range: bytes 0-2000/9880604 Content-Type: application/x-netcdf CDF ... [snip] ... Conventions MADIS surface observations, v1.0title3MADIS - Meteorological Surface - Integrated Mesonet startTime2008-06-10T12:00:00ZendTime2008-06-10T12:59:59ZstationIdVariable stationIdstationDescriptionVariable stationNamestatioMADIS_MESONETnaming_authoritnoaa.govthredds_data_typeStationhistory.revision: 1.1; date: 2007/01/19; author: barth creator_nameMichael F. Barth address@hidden ...[snip]... includes quality-controlled reports from many observing netw Connection to funnel.sfsu.edu closed by foreign host. zero.unidata.ucar.edu: --------------------------------------------------------------------------- Exception in thread "AWT-EventQueue-0" opendap.dap.parser.TokenMgrError: Lexical error at line 1, column 3. Encountered: "<" (60), after : "" at opendap.dap.parser.DDSParserTokenManager.getNextToken(DDSParserTokenManager.java:1085) at opendap.dap.parser.DDSParser.jj_ntk(DDSParser.java:824) at opendap.dap.parser.DDSParser.Dataset(DDSParser.java:93) at opendap.dap.DDS.parse(DDS.java:1063) at opendap.dap.DConnect2$DDSCommand.process(DConnect2.java:452) at opendap.dap.DConnect2.openConnection(DConnect2.java:267) at opendap.dap.DConnect2.getDDS(DConnect2.java:444) at opendap.dap.DConnect2.getDDS(DConnect2.java:424) at ucar.nc2.dods.DODSNetcdfFile.<init>(DODSNetcdfFile.java:178) at ucar.nc2.dataset.NetcdfDataset.openDODS(NetcdfDataset.java:378) at ucar.nc2.dataset.NetcdfDataset.access$000(NetcdfDataset.java:78) at ucar.nc2.dataset.NetcdfDataset$2.open(NetcdfDataset.java:368) at ucar.nc2.NetcdfFileCache.acquire(NetcdfFileCache.java:188) at ucar.nc2.dataset.NetcdfDataset.acquireDODS(NetcdfDataset.java:366) at ucar.nc2.dataset.NetcdfDataset.acquireFile(NetcdfDataset.java:257) at ucar.nc2.ui.ToolsUI.openFile(ToolsUI.java:760) at ucar.nc2.ui.ToolsUI.access$3600(ToolsUI.java:67) Ticket Details =================== Ticket ID: KOO-280301 Department: Support THREDDS Priority: Normal Status: Open
NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.