Blacklight is currently not falling back properly on net_http when curb is not present. If the curb gem is not installed then Blacklight fails to start. Even though the code called within a begin block with a rescue block, it still fails to start with script/server.

In vendor/plugins/blacklight/lib/blacklight.rb I monkey patched the following code to work around this:

begin
      #require 'curb'
      #Blacklight.solr.adapter.connector.adapter_name = :curb
      Blacklight.solr.adapter.connector.adapter_name = :net_http
rescue
      # sticking with Net::HTTP
end