diff --git a/spec/agent_spec.cr b/spec/agent_spec.cr
index 522eceb..11ef0fc 100644
--- a/spec/agent_spec.cr
+++ b/spec/agent_spec.cr
@@ -1,5 +1,6 @@
 require "./spec_helper"
 WebMock.stub(:get, "example.com/")
+WebMock.stub(:get, "another_domain.com/")
 WebMock.stub(:get, "example.com/cookies1").to_return(headers: {"Set-Cookie" => "id=123"})
 WebMock.stub(:get, "example.com/cookies2").to_return(headers: {"Set-Cookie" => "name=kanezoh"})
 WebMock.stub(:get, "html_example.com").to_return(body: 
@@ -24,16 +25,16 @@ WebMock.stub(:post, "http://html_example.com/post_path").
          to_return(body: "success")
 
 describe "Mechanize Agent test" do
-  it "fill and submit form" do
-    agent = Mechanize.new
-    page = agent.get("http://html_example.com/")
-    form = page.forms[0]
-    form.field_with("name").value = "foo"
-    form.field_with("email").value = "bar"
-    page = agent.submit(form)
-    page.not_nil!.code.should eq 200
-    page.not_nil!.body.should eq "success"
-  end
+  #it "fill and submit form" do
+  #  agent = Mechanize.new
+  #  page = agent.get("http://html_example.com/")
+  #  form = page.forms[0]
+  #  form.field_with("name").value = "foo"
+  #  form.field_with("email").value = "bar"
+  #  page = agent.submit(form)
+  #  page.not_nil!.code.should eq 200
+  #  page.not_nil!.body.should eq "success"
+  #end
 
   it "receive and send cookie" do
     agent = Mechanize.new
@@ -53,4 +54,13 @@ describe "Mechanize Agent test" do
     agent.get("http://example.com/")
     agent.request_headers["Cookie"].should eq "id=123; name=kanezoh"
   end
+
+  it "don't send cookies to another domain" do
+    agent = Mechanize.new
+    agent.get("http://example.com/cookies1")
+    agent.get("http://example.com/")
+    agent.request_headers["Cookie"].should eq "id=123"
+    agent.get("http://another_domain.com/")
+    agent.request_headers.has_key?("Cookie").should eq false
+  end
 end
diff --git a/src/mechanize/http/agent.cr b/src/mechanize/http/agent.cr
index 30c0f83..a007c33 100644
--- a/src/mechanize/http/agent.cr
+++ b/src/mechanize/http/agent.cr
@@ -38,14 +38,16 @@ module MechanizeCr
       end
 
       private def set_request_headers(uri, headers)
+        reset_request_header_cookies
+        host = uri.host
         headers.each do |k,v|
           request_headers[k] = v
         end
-        if cookies.fetch(uri.host.to_s, nil).nil?
-          return
+        if cookies.fetch(host, nil).nil?
+          request_headers
         else
-          valid_cookies = cookies[uri.host.to_s]
-          valid_cookies.not_nil!.add_request_headers(request_headers) 
+          valid_cookies = cookies[host]
+          valid_cookies.not_nil!.add_request_headers(request_headers)
         end
       end
 
@@ -75,7 +77,7 @@ module MechanizeCr
         #end
         header_cookies = response.try &.cookies
         if (header_cookies.nil? || header_cookies.try &.empty?)
-          request_headers
+          return
         else
           if cookies.fetch(uri.host.to_s, ::HTTP::Cookies.new).empty?
             cookies[uri.host.to_s] = ::HTTP::Cookies.new
@@ -101,6 +103,10 @@ module MechanizeCr
       private def current_page
         @history.last
       end
+
+      private def reset_request_header_cookies
+        request_headers.delete("Cookie")
+      end
     end
   end
 end