diff --git a/lib/ethon/easy.rb b/lib/ethon/easy.rb
index 69fcdc1..1320707 100644
--- a/lib/ethon/easy.rb
+++ b/lib/ethon/easy.rb
@@ -229,10 +229,11 @@ def initialize(options = {})
     # @see initialize
     def set_attributes(options)
       options.each_pair do |key, value|
-        unless respond_to?("#{key}=")
+        method = "#{key}="
+        unless respond_to?(method)
           raise Errors::InvalidOption.new(key)
         end
-        method("#{key}=").call(value)
+        send(method, value)
       end
     end
 
@@ -244,7 +245,7 @@ def set_attributes(options)
     def reset
       @url = nil
       @hash = nil
-      @on_complete = []
+      @on_complete = nil
       Curl.easy_reset(handle)
       set_callbacks
     end
@@ -278,7 +279,7 @@ def to_hash
         :response_body => response_body
       }
       Easy::Informations::AVAILABLE_INFORMATIONS.keys.each do |info|
-        @hash[info] = method(info).call
+        @hash[info] = send(info)
       end
       @hash
     end
@@ -296,7 +297,7 @@ def log_inspect
         :return_code => return_code,
         :total_time => total_time
       }
-      "EASY #{hash.map{|k, v| "#{k}=#{v}"}.flatten.join(' ')}"
+      "EASY #{hash.map!{|k, v| "#{k}=#{v}"}.flatten.join(' ')}"
     end
   end
 end
diff --git a/lib/ethon/easy/informations.rb b/lib/ethon/easy/informations.rb
index 7c3a9c9..a282a3a 100644
--- a/lib/ethon/easy/informations.rb
+++ b/lib/ethon/easy/informations.rb
@@ -66,9 +66,7 @@ module Informations
       }
 
       AVAILABLE_INFORMATIONS.each do |name, type|
-        define_method(name) do
-          Curl.method("get_info_#{type}").call(name, handle)
-        end
+        eval %Q|def #{name}; Curl.send(:get_info_#{type}, :#{name}, handle); end|
       end
 
       # Returns this curl version supports zlib.
diff --git a/lib/ethon/easy/operations.rb b/lib/ethon/easy/operations.rb
index 3308462..df2127d 100644
--- a/lib/ethon/easy/operations.rb
+++ b/lib/ethon/easy/operations.rb
@@ -22,7 +22,7 @@ def handle
       def perform
         @return_code = Curl.easy_perform(handle)
         complete
-        Ethon.logger.debug("ETHON: performed #{self.log_inspect}")
+        Ethon.logger.debug { "ETHON: performed #{self.log_inspect}" }
         @return_code
       end
 
diff --git a/lib/ethon/easy/options.rb b/lib/ethon/easy/options.rb
index f635f44..32743c0 100644
--- a/lib/ethon/easy/options.rb
+++ b/lib/ethon/easy/options.rb
@@ -522,11 +522,29 @@ def postfieldsize=(value)
         Curl.set_option(:postfieldsize, value_for(value, :int), handle)
       end
 
+      # Pass a bitmask to control how libcurl acts on redirects after
+      # POSTs that get a 301, 302 or 303 response back. A parameter
+      # with bit 0 set (value CURL_REDIR_POST_301) tells the library
+      # to respect RFC 2616/10.3.2 and not convert POST requests into
+      # GET requests when following a 301 redirection. Setting bit 1
+      # (value CURL_REDIR_POST_302) makes libcurl maintain the request
+      # method after a 302 redirect whilst setting bit 2 (value
+      # CURL_REDIR_POST_303) makes libcurl maintain the request method
+      # after a 303 redirect. The value CURL_REDIR_POST_ALL is a
+      # convenience define that sets all three bits.
+      #
+      # The non-RFC behaviour is ubiquitous in web browsers, so the
+      # library does the conversion by default to maintain
+      # consistency. However, a server may require a POST to remain a
+      # POST after such a redirection. This option is meaningful only
+      # when setting CURLOPT_FOLLOWLOCATION. (Added in 7.17.1) (This
+      # option was known as CURLOPT_POST301 up to 7.19.0 as it only
+      # supported the 301 then)
+      #
+      # @example Set postredir option.
+      #   easy.postredir = :post_all
       #
-      # @example Set protocols option.
-      #   easy.protocols = :http
-      #
-      # @param [ Symbol ] value The value or array of values to set.
+      # @param [ Symbol ] value The value to set.
       #
       # @return [ void ]
       def postredir=(value)
diff --git a/lib/ethon/easy/queryable.rb b/lib/ethon/easy/queryable.rb
index 664996c..1d6ccf5 100644
--- a/lib/ethon/easy/queryable.rb
+++ b/lib/ethon/easy/queryable.rb
@@ -27,12 +27,14 @@ def empty?
       #
       # @return [ String ] The string representation.
       def to_s
-        query_pairs.map{ |pair|
+        @to_s ||= query_pairs.map{ |pair|
           return pair if pair.is_a?(String)
 
-          pair.map{ |e|
-            escape && @easy ? @easy.escape(e.to_s) : e
-          }.join("=")
+          if escape && @easy
+            pair.map{ |e| @easy.escape(e.to_s) }.join("=")
+          else
+            pair.join("=")
+          end
         }.join('&')
       end
 
@@ -59,21 +61,7 @@ def build_query_pairs(hash)
         return [hash] if hash.is_a?(String)
 
         pairs = []
-        recursive = Proc.new do |h, prefix|
-          case h
-          when Hash
-            h.each_pair do |k,v|
-              key = prefix == '' ? k : "#{prefix}[#{k}]"
-              pairs_for(v, key, pairs, recursive)
-            end
-          when Array
-            h.each_with_index do |v, i|
-              key = "#{prefix}[#{i}]"
-              pairs_for(v, key, pairs, recursive)
-            end
-          end
-        end
-        recursive.call(hash, '')
+        recursively_generate_pairs(hash, nil, pairs)
         pairs
       end
 
@@ -97,12 +85,27 @@ def file_info(file)
 
       private
 
-      def pairs_for(v, key, pairs,  recursive)
+      def recursively_generate_pairs(h, prefix, pairs)
+        case h
+        when Hash
+          h.each_pair do |k,v|
+            key = prefix.nil? ? k : "#{prefix}[#{k}]"
+            pairs_for(v, key, pairs)
+          end
+        when Array
+          h.each_with_index do |v, i|
+            key = "#{prefix}[#{i}]"
+            pairs_for(v, key, pairs)
+          end
+        end
+      end
+
+      def pairs_for(v, key, pairs)
         case v
         when Hash
-          recursive.call(v, key)
+          recursively_generate_pairs(v, key, pairs)
         when Array
-          recursive.call(v, key)
+          recursively_generate_pairs(v, key, pairs)
         when File, Tempfile
           pairs << [Util.escape_zero_byte(key), file_info(v)]
         else
diff --git a/lib/ethon/easy/response_callbacks.rb b/lib/ethon/easy/response_callbacks.rb
index b41f572..f36521e 100644
--- a/lib/ethon/easy/response_callbacks.rb
+++ b/lib/ethon/easy/response_callbacks.rb
@@ -40,7 +40,7 @@ def on_complete(&block)
       #   request.complete
       def complete
         if defined?(@on_complete)
-          @on_complete.map{ |callback| callback.call(self) }
+          @on_complete.each{ |callback| callback.call(self) }
         end
       end
     end
diff --git a/lib/ethon/multi/operations.rb b/lib/ethon/multi/operations.rb
index a562a8b..0acbcf5 100644
--- a/lib/ethon/multi/operations.rb
+++ b/lib/ethon/multi/operations.rb
@@ -2,6 +2,9 @@ module Ethon
   class Multi # :nodoc
     # This module contains logic to run a multi.
     module Operations
+      STARTED_MULTI = "ETHON: started MULTI"
+      PERFORMED_MULTI = "ETHON: performed MULTI"
+
       # Return the multi handle. Inititialize multi handle,
       # in case it didn't happened already.
       #
@@ -35,7 +38,7 @@ def init_vars
       # @example Perform multi.
       #   multi.perform
       def perform
-        Ethon.logger.debug("ETHON: started MULTI")
+        Ethon.logger.debug(STARTED_MULTI)
         while ongoing?
           run
           timeout = get_timeout
@@ -43,7 +46,7 @@ def perform
           reset_fds
           set_fds(timeout)
         end
-        Ethon.logger.debug("ETHON: performed MULTI")
+        Ethon.logger.debug(PERFORMED_MULTI)
         nil
       end
 
@@ -140,7 +143,7 @@ def check
           next if msg[:code] != :done
           easy = easy_handles.find{ |e| e.handle == msg[:easy_handle] }
           easy.return_code = msg[:data][:code]
-          Ethon.logger.debug("ETHON:         performed #{easy.log_inspect}")
+          Ethon.logger.debug { "ETHON:         performed #{easy.log_inspect}" }
           delete(easy)
           easy.complete
         end