Another try

lib/restclient.rb

@@ -126,6 +126,7 @@ module RestClient
         else
           file_logger = Class.new do
             attr_writer :target_file
+
             def << obj
               File.open(@target_file, 'a') { |f| f.puts obj }
             end
@@ -148,4 +149,15 @@ module RestClient
     @@env_log || @@log
   end
 
+  @@before_execution_procs = []
+
+  # Add a Proc to be called before each request in executed
+  def self.add_before_execution_proc &proc
+    @@before_execution_procs << proc
+  end
+
+  def self.before_execution_procs # :nodoc:
+    @@before_execution_procs
+  end
+
 end

lib/restclient/request.rb

@@ -21,11 +21,10 @@ module RestClient
   # * :ssl_client_cert, :ssl_client_key, :ssl_ca_file
   class Request
 
-    attr_reader :method, :url, :payload, :headers, :processed_headers,
-                :cookies, :user, :password, :timeout, :open_timeout,
-                :verify_ssl, :ssl_client_cert, :ssl_client_key, :ssl_ca_file,
-                :raw_response
-
+    attr_reader :method, :url, :headers, :cookies,
+                :payload, :user, :password, :timeout,
+                :open_timeout, :raw_response, :verify_ssl, :ssl_client_cert,
+                :ssl_client_key, :ssl_ca_file, :processed_headers, :args
 
     def self.execute(args, &block)
       new(args).execute &block
@@ -48,6 +47,7 @@ module RestClient
       @ssl_ca_file = args[:ssl_ca_file] || nil
       @tf = nil # If you are a raw request, this is your tempfile
       @processed_headers = make_headers headers
+      @args = args
     end
 
     def execute &block
@@ -152,6 +152,10 @@ module RestClient
       net.read_timeout = @timeout if @timeout
       net.open_timeout = @open_timeout if @open_timeout
 
+      RestClient.before_execution_procs.each do |b|
+        b.call(req, params)
+      end
+
       log_request
 
       net.start do |http|