diff --git a/lib/pact/consumer/mock_service/cors_origin_header_middleware.rb b/lib/pact/consumer/mock_service/cors_origin_header_middleware.rb
index 1697dd8..7bd185d 100644
--- a/lib/pact/consumer/mock_service/cors_origin_header_middleware.rb
+++ b/lib/pact/consumer/mock_service/cors_origin_header_middleware.rb
@@ -23,7 +23,8 @@ def shutdown
       private
 
       def add_cors_header env, response
-        [response[0], response[1].merge('Access-Control-Allow-Origin' => env.fetch('HTTP_ORIGIN','*')), response[2]]
+        cors_headers = { 'Access-Control-Allow-Origin' => env.fetch('HTTP_ORIGIN','*'), 'Access-Control-Allow-Credentials' => 'true'}
+        [response[0], response[1].merge(cors_headers), response[2]]
       end
     end
   end
diff --git a/spec/features/administration_endpoints_cors_spec.rb b/spec/features/administration_endpoints_cors_spec.rb
index 1625ced..da23c4a 100644
--- a/spec/features/administration_endpoints_cors_spec.rb
+++ b/spec/features/administration_endpoints_cors_spec.rb
@@ -85,21 +85,25 @@
       it "includes the CORS headers in the response to DELETE /interactions" do | example |
         delete "/interactions", nil, admin_headers
         expect(last_response.headers['Access-Control-Allow-Origin']).to eq '*'
+        expect(last_response.headers['Access-Control-Allow-Credentials']).to eq 'true'
       end
 
       it "includes the CORS headers in the response to POST /interactions" do | example |
         post "/interactions", expected_interaction, admin_headers
         expect(last_response.headers['Access-Control-Allow-Origin']).to eq '*'
+        expect(last_response.headers['Access-Control-Allow-Credentials']).to eq 'true'
       end
 
       it "includes the CORS headers in the response to POST /pact" do | example |
         post "/pact", pact_details, admin_headers
         expect(last_response.headers['Access-Control-Allow-Origin']).to eq '*'
+        expect(last_response.headers['Access-Control-Allow-Credentials']).to eq 'true'
       end
 
       it "includes the CORS headers in the response to GET /interactions/verification" do | example |
         get "/interactions/verification", nil, admin_headers
         expect(last_response.headers['Access-Control-Allow-Origin']).to eq '*'
+        expect(last_response.headers['Access-Control-Allow-Credentials']).to eq 'true'
       end
 
       context "when the Origin header is set" do
diff --git a/spec/features/log/mock_multiple_responses_spec.log b/spec/features/log/mock_multiple_responses_spec.log
index d11b5dc..a930e5c 100644
--- a/spec/features/log/mock_multiple_responses_spec.log
+++ b/spec/features/log/mock_multiple_responses_spec.log
@@ -1,4 +1,4 @@
-INFO -- : Cleared interactions for example "Pact::Consumer::MockService when more than one response has been mocked when the actual request matches more than one expected request returns an error response"
+INFO -- : Cleared interactions for example "Pact::Consumer::MockService when more than one response has been mocked when the actual request matches one expected request returns the expected response"
 INFO -- : Registered expected interaction GET /alligators
 DEBUG -- : {
   "description": "a request for alligators",
@@ -20,15 +20,16 @@ DEBUG -- : {
         "name": "Mary"
       }
     ]
-  }
+  },
+  "metadata": null
 }
-INFO -- : Registered expected interaction GET /alligators
+INFO -- : Registered expected interaction GET /zebras
 DEBUG -- : {
-  "description": "a request for alligators",
-  "providerState": "there are no alligators",
+  "description": "a request for zebras",
+  "providerState": "there are zebras",
   "request": {
     "method": "get",
-    "path": "/alligators",
+    "path": "/zebras",
     "headers": {
       "Accept": "application/json"
     }
@@ -39,9 +40,12 @@ DEBUG -- : {
       "Content-Type": "application/json"
     },
     "body": [
-
+      {
+        "name": "Xena Zebra"
+      }
     ]
-  }
+  },
+  "metadata": null
 }
 INFO -- : Received request GET /alligators
 DEBUG -- : {
@@ -56,7 +60,46 @@ DEBUG -- : {
     "Cookie": ""
   }
 }
-ERROR -- : Multiple interactions found for GET /alligators:
+INFO -- : Found matching response for GET /alligators
+DEBUG -- : {
+  "status": 200,
+  "headers": {
+    "Content-Type": "application/json"
+  },
+  "body": [
+    {
+      "name": "Mary"
+    }
+  ]
+}
+INFO -- : Received request GET /zebras
+DEBUG -- : {
+  "method": "get",
+  "query": "",
+  "path": "/zebras",
+  "headers": {
+    "Https": "off",
+    "Content-Length": "0",
+    "Accept": "application/json",
+    "Host": "example.org",
+    "Cookie": ""
+  }
+}
+INFO -- : Found matching response for GET /zebras
+DEBUG -- : {
+  "status": 200,
+  "headers": {
+    "Content-Type": "application/json"
+  },
+  "body": [
+    {
+      "name": "Xena Zebra"
+    }
+  ]
+}
+INFO -- : Verifying - interactions matched for example "Pact::Consumer::MockService when more than one response has been mocked when the actual request matches one expected request returns the expected response"
+INFO -- : Cleared interactions for example "Pact::Consumer::MockService when more than one response has been mocked when the actual request matches more than one expected request returns an error response"
+INFO -- : Registered expected interaction GET /alligators
 DEBUG -- : {
   "description": "a request for alligators",
   "providerState": "alligators exist",
@@ -77,8 +120,10 @@ DEBUG -- : {
         "name": "Mary"
       }
     ]
-  }
+  },
+  "metadata": null
 }
+INFO -- : Registered expected interaction GET /alligators
 DEBUG -- : {
   "description": "a request for alligators",
   "providerState": "there are no alligators",
@@ -97,21 +142,23 @@ DEBUG -- : {
     "body": [
 
     ]
+  },
+  "metadata": null
+}
+INFO -- : Received request GET /alligators
+DEBUG -- : {
+  "method": "get",
+  "query": "",
+  "path": "/alligators",
+  "headers": {
+    "Https": "off",
+    "Content-Length": "0",
+    "Accept": "application/json",
+    "Host": "example.org",
+    "Cookie": ""
   }
 }
-WARN -- : Verifying - actual interactions do not match expected interactions for example "Pact::Consumer::MockService when more than one response has been mocked when the actual request matches more than one expected request returns an error response". 
-Missing requests:
-	GET /alligators
-	GET /alligators
-
-
-WARN -- : Missing requests:
-	GET /alligators
-	GET /alligators
-
-
-INFO -- : Cleared interactions for example "Pact::Consumer::MockService when more than one response has been mocked when the actual request matches one expected request returns the expected response"
-INFO -- : Registered expected interaction GET /alligators
+ERROR -- : Multiple interactions found for GET /alligators:
 DEBUG -- : {
   "description": "a request for alligators",
   "providerState": "alligators exist",
@@ -132,15 +179,15 @@ DEBUG -- : {
         "name": "Mary"
       }
     ]
-  }
+  },
+  "metadata": null
 }
-INFO -- : Registered expected interaction GET /zebras
 DEBUG -- : {
-  "description": "a request for zebras",
-  "providerState": "there are zebras",
+  "description": "a request for alligators",
+  "providerState": "there are no alligators",
   "request": {
     "method": "get",
-    "path": "/zebras",
+    "path": "/alligators",
     "headers": {
       "Accept": "application/json"
     }
@@ -151,60 +198,19 @@ DEBUG -- : {
       "Content-Type": "application/json"
     },
     "body": [
-      {
-        "name": "Xena Zebra"
-      }
+
     ]
-  }
-}
-INFO -- : Received request GET /alligators
-DEBUG -- : {
-  "method": "get",
-  "query": "",
-  "path": "/alligators",
-  "headers": {
-    "Https": "off",
-    "Content-Length": "0",
-    "Accept": "application/json",
-    "Host": "example.org",
-    "Cookie": ""
-  }
-}
-INFO -- : Found matching response for GET /alligators
-DEBUG -- : {
-  "status": 200,
-  "headers": {
-    "Content-Type": "application/json"
-  },
-  "body": [
-    {
-      "name": "Mary"
-    }
-  ]
-}
-INFO -- : Received request GET /zebras
-DEBUG -- : {
-  "method": "get",
-  "query": "",
-  "path": "/zebras",
-  "headers": {
-    "Https": "off",
-    "Content-Length": "0",
-    "Accept": "application/json",
-    "Host": "example.org",
-    "Cookie": ""
-  }
-}
-INFO -- : Found matching response for GET /zebras
-DEBUG -- : {
-  "status": 200,
-  "headers": {
-    "Content-Type": "application/json"
   },
-  "body": [
-    {
-      "name": "Xena Zebra"
-    }
-  ]
+  "metadata": null
 }
-INFO -- : Verifying - interactions matched for example "Pact::Consumer::MockService when more than one response has been mocked when the actual request matches one expected request returns the expected response"
+WARN -- : Verifying - actual interactions do not match expected interactions for example "Pact::Consumer::MockService when more than one response has been mocked when the actual request matches more than one expected request returns an error response". 
+Missing requests:
+	GET /alligators
+	GET /alligators
+
+
+WARN -- : Missing requests:
+	GET /alligators
+	GET /alligators
+
+
diff --git a/spec/features/log/mock_one_response_spec.log b/spec/features/log/mock_one_response_spec.log
index 9b6f24c..31bcfa7 100644
--- a/spec/features/log/mock_one_response_spec.log
+++ b/spec/features/log/mock_one_response_spec.log
@@ -1,4 +1,4 @@
-INFO -- : Cleared interactions for example "Pact::Consumer::MockService when a response has been mocked when the actual request does not match the expected request returns an error response"
+INFO -- : Cleared interactions for example "Pact::Consumer::MockService when a response has been mocked when the actual request matches the expected request returns the expected response"
 INFO -- : Registered expected interaction GET /alligators
 DEBUG -- : {
   "description": "a request for alligators",
@@ -20,7 +20,8 @@ DEBUG -- : {
         "name": "Mary"
       }
     ]
-  }
+  },
+  "metadata": null
 }
 INFO -- : Received request GET /alligators
 DEBUG -- : {
@@ -30,41 +31,25 @@ DEBUG -- : {
   "headers": {
     "Https": "off",
     "Content-Length": "0",
-    "Accept": "application/xml",
+    "Accept": "application/json",
     "Host": "example.org",
     "Cookie": ""
   }
 }
-ERROR -- : No matching interaction found for GET /alligators
-ERROR -- : Interaction diffs for that route:
-ERROR -- : Diff with interaction: "a request for alligators" given "alligators exist"
-Diff
---------------------------------------
-Key: - is expected 
-     + is actual 
-Matching keys and values are not shown
-
- {
-   "headers": {
--    "Accept": "application/json"
-+    "Accept": "application/xml"
-   }
- }
-
-Description of differences
---------------------------------------
-* Expected "application/json" but got "application/xml" at $.headers.Accept
-
-WARN -- : Verifying - actual interactions do not match expected interactions for example "Pact::Consumer::MockService when a response has been mocked when the actual request does not match the expected request returns an error response". 
-Incorrect requests:
-	GET /alligators (request headers did not match)
-
-
-WARN -- : Incorrect requests:
-	GET /alligators (request headers did not match)
-
-
-INFO -- : Cleared interactions for example "Pact::Consumer::MockService when a response has been mocked when the actual request matches the expected request returns the expected response"
+INFO -- : Found matching response for GET /alligators
+DEBUG -- : {
+  "status": 200,
+  "headers": {
+    "Content-Type": "application/json"
+  },
+  "body": [
+    {
+      "name": "Mary"
+    }
+  ]
+}
+INFO -- : Verifying - interactions matched for example "Pact::Consumer::MockService when a response has been mocked when the actual request matches the expected request returns the expected response"
+INFO -- : Cleared interactions for example "Pact::Consumer::MockService when a response has been mocked when the actual request does not match the expected request returns an error response"
 INFO -- : Registered expected interaction GET /alligators
 DEBUG -- : {
   "description": "a request for alligators",
@@ -86,7 +71,8 @@ DEBUG -- : {
         "name": "Mary"
       }
     ]
-  }
+  },
+  "metadata": null
 }
 INFO -- : Received request GET /alligators
 DEBUG -- : {
@@ -96,21 +82,37 @@ DEBUG -- : {
   "headers": {
     "Https": "off",
     "Content-Length": "0",
-    "Accept": "application/json",
+    "Accept": "application/xml",
     "Host": "example.org",
     "Cookie": ""
   }
 }
-INFO -- : Found matching response for GET /alligators
-DEBUG -- : {
-  "status": 200,
-  "headers": {
-    "Content-Type": "application/json"
-  },
-  "body": [
-    {
-      "name": "Mary"
-    }
-  ]
-}
-INFO -- : Verifying - interactions matched for example "Pact::Consumer::MockService when a response has been mocked when the actual request matches the expected request returns the expected response"
+ERROR -- : No matching interaction found for GET /alligators
+ERROR -- : Interaction diffs for that route:
+ERROR -- : Diff with interaction: "a request for alligators" given "alligators exist"
+Diff
+--------------------------------------
+Key: - is expected 
+     + is actual 
+Matching keys and values are not shown
+
+ {
+   "headers": {
+-    "Accept": "application/json"
++    "Accept": "application/xml"
+   }
+ }
+
+Description of differences
+--------------------------------------
+* Expected "application/json" but got "application/xml" at $.headers.Accept
+
+WARN -- : Verifying - actual interactions do not match expected interactions for example "Pact::Consumer::MockService when a response has been mocked when the actual request does not match the expected request returns an error response". 
+Incorrect requests:
+	GET /alligators (request headers did not match)
+
+
+WARN -- : Incorrect requests:
+	GET /alligators (request headers did not match)
+
+
diff --git a/spec/features/mock_interactions_with_cors_spec.rb b/spec/features/mock_interactions_with_cors_spec.rb
index 9dac90f..3bbdd81 100644
--- a/spec/features/mock_interactions_with_cors_spec.rb
+++ b/spec/features/mock_interactions_with_cors_spec.rb
@@ -61,6 +61,7 @@
         # Ensure it allows the browser to actually make the request
         expect(last_response.status).to eq 200
         expect(last_response.headers['Access-Control-Allow-Origin']).to eq 'http://localhost:1234'
+        expect(last_response.headers['Access-Control-Allow-Credentials']).to eq 'true'
         expect(last_response.headers['Access-Control-Allow-Headers']).to include 'accept'
         expect(last_response.headers['Access-Control-Allow-Methods']).to include "DELETE, POST, GET, HEAD, PUT, TRACE, CONNECT"