Errors/Exceptions should be formated by ResponseWriter
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Key: SOLR-141
URL: https://issues.apache.org/jira/browse/SOLR-141
Project: Solr
Issue Type: Wish
Reporter: Hoss Man
Whenever possible, the Solr Dispatcher should to let the ResponseWriter format
Exceptions using the format the user expects -- this should in no way change
the fact that Exceptions currently generate non 200 HTTP status codes, nor
should it prevent the Dispatcher from using the exception message as the HTTP
status message -- but clients that want the full details of the error should be
able to parse them in the format they expected based on the request.
this would also give RequestHandlers the oportunity to return "partial" results
- by adding both whatever results they have to the Response as well as the
Exception they encountered.
situations where this can't happen are obviously:
* Exception thrown by ResponseWriter
* Exception thrown so early in the request thta the DIspather doesn't know
which ResposneWriter the client wanted.
...in those cases, plain text is a wise choice.
thing that would probably need to be done to make this work:
1) if the Dispatcher catches an exception, it should call
SolrQueryResponse.setException, set the HTTP status code/message as it
currently does, but then hand off to the ResponseWriter.
2) Dispatcher needs to check SolrQueryResponse.getException and set the HTTP
status code/message just like if it caught the exception itself.
3) all of the ResponseWriters should start looking at
SolrQueryResponse.getException if they aren't already, and formatting it in a
usefull way.
4) if the ResponseWriter throws an exception, Dispatcher needs to return a nice
plain text error page
extension to this idea... add a new method to ResponseWriter to generate a
generic error message in the appropriate format that Dispatcher can use if the
ResponseWriter throws an exception (as a backup before resorting to plain text)
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