diff --git a/CHANGELOG.md b/CHANGELOG.md
index 73c420e..71d9506 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Idempotent Request Changelog #
 
+## v0.1.2 ##
+
+* Fix rack response
+* Disuse SETNX (@espadrine)
+
 ## v0.1.1 ##
 
-*   Add caching for successful responses (@gomayonqui)
+* Add caching for successful responses (@gomayonqui)
diff --git a/lib/idempotent-request/redis_storage.rb b/lib/idempotent-request/redis_storage.rb
index faa88ff..1594b52 100644
--- a/lib/idempotent-request/redis_storage.rb
+++ b/lib/idempotent-request/redis_storage.rb
@@ -13,8 +13,14 @@ module IdempotentRequest
     end
 
     def write(key, payload)
-      redis.setnx(namespaced_key(key), payload)
-      redis.expire(namespaced_key(key), expire_time.to_i) if expire_time.to_i > 0
+      redis.set(
+        namespaced_key(key),
+        payload,
+        {}.tap do |options|
+          options[:nx] = true
+          options[:ex] = expire_time.to_i if expire_time.to_i > 0
+        end
+      )
     end
 
     private
diff --git a/lib/idempotent-request/request_manager.rb b/lib/idempotent-request/request_manager.rb
index 9a43f0e..1c45027 100644
--- a/lib/idempotent-request/request_manager.rb
+++ b/lib/idempotent-request/request_manager.rb
@@ -36,7 +36,7 @@ module IdempotentRequest
       Oj.dump({
         status: status,
         headers: headers.to_h,
-        response: response
+        response: Array(response)
       })
     end
 
diff --git a/lib/version.rb b/lib/version.rb
index ba256ce..7d917b7 100644
--- a/lib/version.rb
+++ b/lib/version.rb
@@ -1,3 +1,3 @@
 module IdempotentRequest
-  VERSION = "0.1.1"
+  VERSION = "0.1.2"
 end
diff --git a/spec/idempotent-request/redis_storage_spec.rb b/spec/idempotent-request/redis_storage_spec.rb
index 2a9a9db..8c37a5d 100644
--- a/spec/idempotent-request/redis_storage_spec.rb
+++ b/spec/idempotent-request/redis_storage_spec.rb
@@ -3,7 +3,8 @@ require 'spec_helper'
 RSpec.describe IdempotentRequest::RedisStorage do
   let(:redis) { FakeRedis::Redis.new }
   let(:expire_time) { 3600 }
-  let(:redis_storage) { described_class.new(redis, expire_time: expire_time) }
+  let(:namespace) { 'idempotency_keys' }
+  let(:redis_storage) { described_class.new(redis, expire_time: expire_time, namespace: namespace) }
 
   describe '#read' do
     it 'should be called' do
@@ -15,12 +16,13 @@ RSpec.describe IdempotentRequest::RedisStorage do
   describe '#write' do
     let(:key) { 'key' }
     let(:payload) { {} }
+    let(:namespace) { nil }
 
     context 'when expire time is not set' do
-      let(:redis_storage) { described_class.new(redis) }
+      let(:expire_time) { nil }
 
       it 'should not set expiration' do
-        expect(redis).to receive(:setnx)
+        expect(redis).to receive(:set).with(key, payload, nx: true)
         expect(redis).not_to receive(:expire)
         redis_storage.write(key, payload)
       end
@@ -28,14 +30,15 @@ RSpec.describe IdempotentRequest::RedisStorage do
 
     context 'when expire time is set' do
       it 'should set expiration' do
-        expect(redis).to receive(:setnx)
-        expect(redis).to receive(:expire).with(String, expire_time)
+        expect(redis).to receive(:set).with(key, payload, nx: true, ex: expire_time)
         redis_storage.write(key, payload)
       end
     end
   end
 
   describe '#namespaced_key' do
+    let(:namespace) { 'idempotency_keys' }
+
     subject { redis_storage.send(:namespaced_key, key) }
 
     context 'when key contains a space' do
@@ -55,7 +58,7 @@ RSpec.describe IdempotentRequest::RedisStorage do
     end
 
     context 'when namespace is set to nil' do
-      let(:redis_storage) { described_class.new(redis, namespace: nil) }
+      let(:namespace) { nil }
       let(:key) { 'REQUEST-1' }
 
       it 'should return with default' do
diff --git a/spec/idempotent-request/request_manager_spec.rb b/spec/idempotent-request/request_manager_spec.rb
index a5f75e1..0caf68a 100644
--- a/spec/idempotent-request/request_manager_spec.rb
+++ b/spec/idempotent-request/request_manager_spec.rb
@@ -77,7 +77,7 @@ RSpec.describe IdempotentRequest::RequestManager do
       Oj.dump({
         status: data[0],
         headers: data[1],
-        response: data[2]
+        response: [data[2]]
       })
     end