DAP4 Serialization Patch - libdap4

[ndp-opendap]

Original Ticket

[ndp-opendap]

Like this:

<Group 
    xmlns:xml="http://www.w3.org/XML/1998/namespace" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://xml.opendap.org/ns/DAP/4.0# http://xml.opendap.org/dap/dap4.0.xsd" 
    xmlns="http://xml.opendap.org/ns/DAP/4.0#" 
    dapVersion="4.0" 
    dmrVersion="1.0"
    dap:serialization="4.0" 
    name="fnoc1.nc">

[ndp-opendap]

I am now thinking that adding anything to the DMR is the wrong move.

Consider This Alternative

What oil instead of adding something to the DMR we instead add the HTTP response header Server, like the Apache Web Server does?
What if the HTTP response headers from Hyrax had the server version:

HTTP/1.1 200 200
Date: Thu, 16 Apr 2026 18:44:16 GMT
Server: Hyrax/1.17.1-1254
X-FRAME-OPTIONS: DENY
Last-Modified: Thu, 23 Sep 2021 19:45:14 GMT
XDODS-Server: dods/3.2
XOPeNDAP-Server: asciival/, bes/, csv_handler/, dapreader_module/, dmrpp_module/, fileout_covjson/, fileout_json/, fileout_netcdf/, freeform_handler/, functions/, gateway/, hdf4_handler/, hdf5_handler/, libdap/, ncml_moddule/, netcdf_handler/, s3_reader/, usage/, w10n_handler/, xml_data_handler/
X-DAP: 3.2
Content-Description: application/vnd.opendap.dap4.dataset-metadata+xml
Content-Type: application/vnd.opendap.dap4.dataset-metadata+xml
Transfer-Encoding: chunked

<?xml version="1.0" encoding="ISO-8859-1"?>
<Dataset xmlns="http://xml.opendap.org/ns/DAP/4.0#" xml:base="http://test.opendap.org/opendap/data/nc/fnoc1.nc" dapVersion="4.0" dmrVersion="2.0" name="fnoc1.nc">

@Mikejmnez says this would work for pyDap and it stays out of our nominal dap4 transmission content.

So I am going to add this to the OLFS in opendap/coreServlet/DispatchServlet.doGet() and make a test deploy build to try.

[ndp-opendap]

Test deployment is live!

curl -i http://test.opendap.org:8080/opendap/data/nc/fnoc1.nc.dds
curl -i http://test.opendap.org:8080/opendap/data/nc/fnoc1.nc.dmr
curl -i http://test.opendap.org:8080/opendap/data/

[jgallagher59701]

I have a question about:

<Group 
    xmlns:xml="http://www.w3.org/XML/1998/namespace" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://xml.opendap.org/ns/DAP/4.0# http://xml.opendap.org/dap/dap4.0.xsd" 
    xmlns="http://xml.opendap.org/ns/DAP/4.0#" 
    dapVersion="4.0" 
    dmrVersion="1.0"
    dap:serialization="4.0" 
    name="fnoc1.nc">

Using the namespace prefix with the new attribute: dap:serialization, do we need to add xmlns:dap=...?

Did you add this so that an existing parser would ignore the new attribute?

[ndp-opendap]

This issue is, I believe OWBE - There's a better way!

This OLFS ticket solves this issue without messing with any DAP4 response content.