DataImportHandler; reload-config; response in case of failure & further requests
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                 Key: SOLR-2482
                 URL: https://issues.apache.org/jira/browse/SOLR-2482
             Project: Solr
          Issue Type: Improvement
          Components: contrib - DataImportHandler, web gui
            Reporter: Stefan Matheis (steffkes)
            Priority: Minor
         Attachments: reload-config-error.html

Reloading while the config-file is valid is completely fine, but if the config 
is broken - the Response is plain HTML, containing the full stacktrace (see 
attachment). further requests contain a {{status}} Element with 
??DataImportHandler started. Not Initialized. No commands can be run??, but 
respond with a HTTP-Status 200 OK :/

Would be nice, if:
* the response in case of error could also be xml formatted
* contain the exception message (in my case ??The end-tag for element type 
"entity" must end with a '>' delimiter.??) in a seperate field
* use a better/correct http-status for the latter mentioned requests, i would 
suggest {{503 Service Unavailable}}

So we are able to display to error-message to the user, while the config gets 
broken - and for the further requests we could rely on the http-status and have 
no need to check the content of the xml-response.

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