diff --git a/lib/CurlBuilder.js b/lib/CurlBuilder.js
index eae337f..30a3a07 100644
--- a/lib/CurlBuilder.js
+++ b/lib/CurlBuilder.js
@@ -39,7 +39,7 @@
         var args, c, cb, k, length, v, _ref, _ref1, _ref2, _ref3, _ref4;
         args = 1 <= arguments.length ? __slice.call(arguments, 0) : [];
         if (this.running) {
-          throw new Error('the cURL session is busy, use CurlBuilder.create to create another cURL Session');
+          throw new Error('the cURL session is busy, use curl.create to create another cURL Session');
         }
         if (!this.curl_) {
           throw new Error('the cURL is closed.');
@@ -54,19 +54,21 @@
         c.chunks = [];
         length = 0;
         this.debug = (_ref1 = (_ref2 = this.defaultOptions.DEBUG) != null ? _ref2 : this.options.DEBUG) != null ? _ref1 : this.debug;
-        this.effective_options = {};
+        this.effectiveOptions = {};
         _ref3 = this.defaultOptions;
         for (k in _ref3) {
           v = _ref3[k];
-          this.effective_options[k] = v;
+          this.effectiveOptions[k] = v;
         }
         _ref4 = this.options;
         for (k in _ref4) {
           v = _ref4[k];
-          this.effective_options[k] = v;
+          this.effectiveOptions[k] = v;
         }
-        this.setOptions(this.effective_options);
-        this.curl_.setopt('URL', this.url);
+        this.setOptions(this.effectiveOptions);
+        this.setOptions({
+          URL: this.url
+        });
         c.on_write = function(chunk) {
           curl.log("receive " + chunk.length + " bytes");
           c.chunks.push(chunk);
@@ -114,7 +116,7 @@
         if (reset == null) {
           reset = true;
         }
-        this.defaultOptions = options;
+        defaultOptions = options;
         if (reset) {
           this.log('Set default options and reset cURL');
           return this.reset();
diff --git a/lib/CurlBuilder.toffee b/lib/CurlBuilder.toffee
index 0cbdfc2..54d1ebe 100644
--- a/lib/CurlBuilder.toffee
+++ b/lib/CurlBuilder.toffee
@@ -18,7 +18,7 @@ class CurlBuilder
 
     curl.perform = (args...) ->
       if @running
-        throw new Error 'the cURL session is busy, use CurlBuilder.create to create another cURL Session'
+        throw new Error 'the cURL session is busy, use curl.create to create another cURL Session'
 
       if !@curl_
         throw new Error 'the cURL is closed.'
@@ -37,15 +37,15 @@ class CurlBuilder
       @debug = @defaultOptions.DEBUG ? @options.DEBUG ? @debug
 
 
-      @effective_options = {}
+      @effectiveOptions = {}
       for k, v of @defaultOptions
-        @effective_options[k] = v
+        @effectiveOptions[k] = v
+
       for k, v of @options
-        @effective_options[k] = v
+        @effectiveOptions[k] = v
 
-      @setOptions @effective_options
-
-      @curl_.setopt('URL', @url)
+      @setOptions @effectiveOptions
+      @setOptions {URL: @url}
 
       c.on_write = (chunk) ->
         curl.log "receive #{chunk.length} bytes"
@@ -84,7 +84,7 @@ class CurlBuilder
 
 
     curl.setDefaultOptions = (options = {}, reset = true) ->
-      @defaultOptions = options
+      defaultOptions = options
       if reset
         @log 'Set default options and reset cURL'
         @reset()