Proxy cannot deal with usecontent=orig yet

[jan-niestadt]

This Solr URL works:

http://localhost:8983/solr/test/select?bl.op=hits&bl.patt=%22the%22&indent=true&q.op=OR&q=*%3A*

But the proxy doesn't understand the different response structure it receives when usecontent=orig ("Expected START_OBJECT, found VALUE_STRING").