NEW: Add support for HTTPS, close #111.

Usage:
var client = solr.createClient({ secure : true});

lib/solr.js

@@ -11,6 +11,7 @@
  */
 
 var http = require('http'),
+   https = require('https'),
    Query = require('./query'),
    querystring = require('querystring'),
    format = require('./utils/format'),
@@ -33,18 +34,21 @@ exports.createClient = createClient;
  * @param {Number|String} [port='8983'] - port of the Solr server
  * @param {String} [core=''] - name of the Solr core requested
  * @param {String} [path='/solr'] - root path of all requests
+ * @param {http.Agent} [agent] - HTTP Agent which is used for pooling sockets used in HTTP(s) client requests
+ * @param {Boolean} [secure=false] - if true HTTPS will be used instead of HTTP
  *
  * @return {Client}
  * @api public
  */
 
-function createClient(host, port, core, path, agent){
+function createClient(host, port, core, path, agent, secure){
   var options = (typeof host === 'object')? host : {
       host : host,
       port : port,
       core : core,
       path : path,
-      agent : agent
+      agent : agent,
+      secure : secure
    };
   return new Client(options);
 }
@@ -69,7 +73,8 @@ function Client(options){
       port : options.port || '8983',
       core : options.core || '',
       path : options.path || '/solr',
-      agent : options.agent
+      agent : options.agent,
+      secure : options.secure || false
    };
 
    // Default paths of all request handlers
@@ -212,8 +217,9 @@ Client.prototype.createAddStream = function(options){
    if(this.options.authorization){
       headers['authorization'] = this.options.authorization;
    }
+   var protocol = this.options.secure ? 'https' : 'http';
    var optionsRequest = {
-      url : 'http://' + this.options.host +':' + this.options.port + path ,
+      url : protocol + '://' + this.options.host +':' + this.options.port + path ,
       method : 'POST',
       headers : headers
    };
@@ -583,6 +589,17 @@ Client.prototype.ping = function(callback){
    return this.get(this.ADMIN_PING_HANDLER, callback);
 }
 
+/**
+ * Pick appropriate protocol based on the given `secure` flag
+ *
+ * @param {Boolean} secure -
+ * @return {Object} http or https module
+ */
+
+function pickProtocol(secure){
+   return secure ? https : http;
+};
+
 /**
  * HTTP POST request. Send update commands to the Solr server (commit, add, delete, optimize)
  *
@@ -622,7 +639,7 @@ function postJSON(params,callback){
       options.agent = params.agent;
    }
 
-   var request = http.request(options);
+   var request = pickProtocol(params.secure).request(options);
 
    request.on('response', handleJSONResponse(request,callback));
 
@@ -675,7 +692,7 @@ function getJSON(params,callback){
       options.headers = headers;
    }
 
-   var request = http.get(options);
+   var request = pickProtocol(params.secure).get(options);
 
    request.on('response', handleJSONResponse(request,callback));
 

test/createClient-test.js

@@ -42,5 +42,14 @@ describe('solr',function(){
             assert.equal(client.options.core,'core1');
             assert.equal(client.options.path,'/solr4');
 		});
-	})
+	});
+	describe('.createClient({ secure : true })', function(){
+		it('should create a `Client` instance with secure set to true', function(){
+			var options = {
+				secure : true
+			};
+			var client = solr.createClient(options);
+			assert.isTrue(client.options.secure);
+		});
+	});
 });