NPE in spi2dav when server does not send all headers
----------------------------------------------------

                 Key: JCR-3210
                 URL: https://issues.apache.org/jira/browse/JCR-3210
             Project: Jackrabbit Content Repository
          Issue Type: Bug
          Components: jackrabbit-spi2dav
    Affects Versions: 2.3.5
            Reporter: Tobias Bocanegra
            Priority: Minor


The ValueLoader may throw a NPE if the desired headers are not present in the 
response:

org.apache.jackrabbit.spi2davex.ValueLoader:

    public Map<String, String> loadHeaders(String uri, String[] headerNames) 
throws IOException, RepositoryException {
    ....
                for (String name : headerNames) {
--->                headers.put(name, 
method.getResponseHeader(name).getValue());
                }
    .....
    }

In my case, the server does not return the ETag response header, but the 
'loadHeaders' is indirectly called by the QValueFactoryImpl:

                        this.preInitialize(new String[] {HEADER_ETAG, 
HEADER_LAST_MODIFIED});


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