diff --git a/Makefile b/Makefile
index 592211d..caa956c 100644
--- a/Makefile
+++ b/Makefile
@@ -27,6 +27,3 @@ unit-coverage:
 
 ci-coverage: init
 	composer ci-coverage
-
-mutation:
-	composer mutation
diff --git a/README.md b/README.md
index 66fa7be..e9014c4 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,8 @@ Currently the only provided locator is the `ContainerLocator` which accepts a
         return resolve($response);
     })->then(function (ResponseInterface $response) use ($runner) {
         return $runner->post($response);
+    })->otherwise(function (Throwable $throwable) use ($runner) {
+        return reject($runner->error($throwable));
     });
 ```
 
diff --git a/appveyor.yml b/appveyor.yml
index d51dda0..a7e6cce 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -19,9 +19,13 @@ environment:
   - dependencies: highest
     php_ver_target: 7.1
 
-## Cache composer bits
+## Cache composer, chocolatey and php bits
 cache:
     - '%LOCALAPPDATA%\Composer\files -> composer.lock'
+    - composer.phar
+    - C:\ProgramData\chocolatey\bin -> .appveyor.yml
+    - C:\ProgramData\chocolatey\lib -> .appveyor.yml
+    - c:\tools\php -> .appveyor.yml
 
 ## Set up environment varriables
 init:
@@ -33,7 +37,7 @@ init:
 ## Install PHP and composer, and run the appropriate composer command
 install:
     - IF EXIST c:\tools\php (SET PHP=0)
-    - ps: appveyor-retry cinst -y php --version ((choco search php --exact --all-versions -r | select-string -pattern $Env:php_ver_target | Select-Object -first 1) -replace '[php|]','')
+    - ps: appveyor-retry cinst --params '""/InstallDir:C:\tools\php""' --ignore-checksums -y php --version ((choco search php --exact --all-versions -r | select-string -pattern $env:php_ver_target | sort { [version]($_ -split '\|' | select -last 1) } -Descending | Select-Object -first 1) -replace '[php|]','')
     - cd c:\tools\php
     - IF %PHP%==1 copy php.ini-production php.ini /Y
     - IF %PHP%==1 echo date.timezone="UTC" >> php.ini
@@ -52,4 +56,4 @@ install:
 ## Run the actual test
 test_script:
     - cd c:\projects\php-project-workspace
-    - vendor/bin/phpunit -c phpunit.xml.dist
+    - vendor/bin/phpunit -c phpunit.xml.dist
\ No newline at end of file
diff --git a/composer.json b/composer.json
index 911dffb..470cc8f 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
     "react/promise": "^2.4"
   },
   "require-dev": {
-    "api-clients/test-utilities": "^1.0",
+    "api-clients/test-utilities": "^3.0",
     "container-interop/container-interop": "^1.1",
     "guzzlehttp/psr7": "^1.3"
   },
@@ -54,10 +54,6 @@
       "@ensure-installed",
       "phpunit --colors=always -c phpunit.xml.dist --coverage-text --coverage-html covHtml --coverage-clover ./build/logs/clover.xml"
     ],
-    "mutation": [
-      "@ensure-installed",
-      "if [ `php -m | grep xdebug | wc -l` -gt 0 ]; then humbug --ansi --incremental; fi"
-    ],
     "lint-php": [
       "@ensure-installed",
       "parallel-lint --exclude vendor ."
@@ -65,14 +61,12 @@
     "qa-all": [
       "@lint-php",
       "@cs",
-      "@unit",
-      "@mutation"
+      "@unit"
     ],
     "qa-all-coverage": [
       "@lint-php",
       "@cs",
-      "@unit-coverage",
-      "@mutation"
+      "@unit-coverage"
     ],
     "qa-windows": [
       "@lint-php",
diff --git a/composer.lock b/composer.lock
index 1f4f2bc..444c9ea 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "bb8aa6bb9df01026ee175883318d570d",
+    "content-hash": "276db0aba3a29236d8bcc66d34c32346",
     "packages": [
         {
             "name": "psr/http-message",
@@ -103,27 +103,25 @@
     "packages-dev": [
         {
             "name": "api-clients/test-utilities",
-            "version": "1.0.0",
+            "version": "3.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/php-api-clients/test-utilities.git",
-                "reference": "26e92e4c1bb132cd78d247fa210f2bb2308488f8"
+                "reference": "efab1bb505e04e4b9e3c995393451e0eebb9ba7d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-api-clients/test-utilities/zipball/26e92e4c1bb132cd78d247fa210f2bb2308488f8",
-                "reference": "26e92e4c1bb132cd78d247fa210f2bb2308488f8",
+                "url": "https://api.github.com/repos/php-api-clients/test-utilities/zipball/efab1bb505e04e4b9e3c995393451e0eebb9ba7d",
+                "reference": "efab1bb505e04e4b9e3c995393451e0eebb9ba7d",
                 "shasum": ""
             },
             "require": {
                 "clue/block-react": "^1.1",
-                "humbug/humbug": "1.0.0-alpha2",
                 "jakub-onderka/php-console-highlighter": "^0.3.2",
                 "jakub-onderka/php-parallel-lint": "^0.9.2",
                 "phake/phake": "^2.3",
                 "php": "^7.0",
-                "phpspec/prophecy": "^1.6",
-                "phpunit/phpunit": "^5.6",
+                "phpunit/phpunit": "^6.0",
                 "squizlabs/php_codesniffer": "^2.6"
             },
             "type": "library",
@@ -142,7 +140,7 @@
                     "email": "ceesjank@gmail.com"
                 }
             ],
-            "time": "2016-12-04T22:25:39+00:00"
+            "time": "2017-02-04T10:56:09+00:00"
         },
         {
             "name": "clue/block-react",
@@ -194,18 +192,21 @@
         },
         {
             "name": "container-interop/container-interop",
-            "version": "1.1.0",
+            "version": "1.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/container-interop/container-interop.git",
-                "reference": "fc08354828f8fd3245f77a66b9e23a6bca48297e"
+                "reference": "79cbf1341c22ec75643d841642dd5d6acd83bdb8"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/container-interop/container-interop/zipball/fc08354828f8fd3245f77a66b9e23a6bca48297e",
-                "reference": "fc08354828f8fd3245f77a66b9e23a6bca48297e",
+                "url": "https://api.github.com/repos/container-interop/container-interop/zipball/79cbf1341c22ec75643d841642dd5d6acd83bdb8",
+                "reference": "79cbf1341c22ec75643d841642dd5d6acd83bdb8",
                 "shasum": ""
             },
+            "require": {
+                "psr/container": "^1.0"
+            },
             "type": "library",
             "autoload": {
                 "psr-4": {
@@ -217,7 +218,8 @@
                 "MIT"
             ],
             "description": "Promoting the interoperability of container objects (DIC, SL, etc.)",
-            "time": "2014-12-30T15:22:37+00:00"
+            "homepage": "https://github.com/container-interop/container-interop",
+            "time": "2017-02-14T19:40:03+00:00"
         },
         {
             "name": "doctrine/instantiator",
@@ -275,16 +277,16 @@
         },
         {
             "name": "guzzlehttp/psr7",
-            "version": "1.3.1",
+            "version": "1.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "5c6447c9df362e8f8093bda8f5d8873fe5c7f65b"
+                "reference": "0d6c7ca039329247e4f0f8f8f6506810e8248855"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/psr7/zipball/5c6447c9df362e8f8093bda8f5d8873fe5c7f65b",
-                "reference": "5c6447c9df362e8f8093bda8f5d8873fe5c7f65b",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/0d6c7ca039329247e4f0f8f8f6506810e8248855",
+                "reference": "0d6c7ca039329247e4f0f8f8f6506810e8248855",
                 "shasum": ""
             },
             "require": {
@@ -320,83 +322,23 @@
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Tobias Schultze",
+                    "homepage": "https://github.com/Tobion"
                 }
             ],
-            "description": "PSR-7 message implementation",
+            "description": "PSR-7 message implementation that also provides common utility methods",
             "keywords": [
                 "http",
                 "message",
+                "request",
+                "response",
                 "stream",
-                "uri"
-            ],
-            "time": "2016-06-24T23:00:38+00:00"
-        },
-        {
-            "name": "humbug/humbug",
-            "version": "1.0.0-alpha2",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/padraic/humbug.git",
-                "reference": "06b1c059e432dab8c22c36bc8b6e1ffc7e587c07"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/padraic/humbug/zipball/06b1c059e432dab8c22c36bc8b6e1ffc7e587c07",
-                "reference": "06b1c059e432dab8c22c36bc8b6e1ffc7e587c07",
-                "shasum": ""
-            },
-            "require": {
-                "padraic/phar-updater": "^1.0.0",
-                "padraic/phpunit-accelerator": "^1.0.2",
-                "padraic/phpunit-extensions": "^1.0.0",
-                "php": ">=5.4.0",
-                "phpunit/phpunit": "^4.5|^5.0",
-                "sebastian/diff": "^1.1",
-                "symfony/console": "^2.6|^3.0",
-                "symfony/event-dispatcher": "^2.6|^3.0",
-                "symfony/finder": "^2.6|^3.0",
-                "symfony/process": "^2.6|^3.0"
-            },
-            "require-dev": {
-                "behat/behat": "^3.0.15",
-                "mikey179/vfsstream": "^1.4",
-                "mockery/mockery": "^0.9",
-                "symfony/filesystem": "^2.6|^3.0"
-            },
-            "bin": [
-                "bin/humbug"
-            ],
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Humbug\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Pádraic Brady",
-                    "email": "padraic.brady@gmail.com",
-                    "homepage": "http://blog.astrumfutura.com"
-                }
+                "uri",
+                "url"
             ],
-            "description": "Humbug is a Mutation Testing framework for PHP. Whereas Code Coverage can tell you what code your tests are executing, Mutation Testing is intended to help you judge how well your unit tests actually perform and where they could be improved.",
-            "homepage": "https://github.com/padraic/humbug",
-            "keywords": [
-                "coverage",
-                "mutation testing",
-                "testing",
-                "unit testing"
-            ],
-            "time": "2016-08-01T10:27:00+00:00"
+            "time": "2017-02-27T10:51:17+00:00"
         },
         {
             "name": "jakub-onderka/php-console-color",
@@ -534,16 +476,16 @@
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.5.5",
+            "version": "1.6.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "399c1f9781e222f6eb6cc238796f5200d1b7f108"
+                "reference": "5a5a9fc8025a08d8919be87d6884d5a92520cefe"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/399c1f9781e222f6eb6cc238796f5200d1b7f108",
-                "reference": "399c1f9781e222f6eb6cc238796f5200d1b7f108",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/5a5a9fc8025a08d8919be87d6884d5a92520cefe",
+                "reference": "5a5a9fc8025a08d8919be87d6884d5a92520cefe",
                 "shasum": ""
             },
             "require": {
@@ -572,221 +514,7 @@
                 "object",
                 "object graph"
             ],
-            "time": "2016-10-31T17:19:45+00:00"
-        },
-        {
-            "name": "padraic/humbug_get_contents",
-            "version": "1.0.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/padraic/file_get_contents.git",
-                "reference": "66797199019d0cb4529cb8d29c6f0b4c5085b53a"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/padraic/file_get_contents/zipball/66797199019d0cb4529cb8d29c6f0b4c5085b53a",
-                "reference": "66797199019d0cb4529cb8d29c6f0b4c5085b53a",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "~4.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Humbug\\": "src/Humbug/"
-                },
-                "files": [
-                    "src/function.php"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Pádraic Brady",
-                    "email": "padraic.brady@gmail.com",
-                    "homepage": "http://blog.astrumfutura.com"
-                }
-            ],
-            "description": "Secure wrapper for accessing HTTPS resources with file_get_contents for PHP 5.3+",
-            "homepage": "https://github.com/padraic/file_get_contents",
-            "keywords": [
-                "download",
-                "file_get_contents",
-                "http",
-                "https",
-                "ssl",
-                "tls"
-            ],
-            "time": "2015-04-22T18:45:00+00:00"
-        },
-        {
-            "name": "padraic/phar-updater",
-            "version": "1.0.3",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/padraic/phar-updater.git",
-                "reference": "c17eeb3887dc4269d1b4837dc875d39e9f8149a8"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/padraic/phar-updater/zipball/c17eeb3887dc4269d1b4837dc875d39e9f8149a8",
-                "reference": "c17eeb3887dc4269d1b4837dc875d39e9f8149a8",
-                "shasum": ""
-            },
-            "require": {
-                "padraic/humbug_get_contents": "^1.0",
-                "php": ">=5.3.3"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "~4.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Humbug\\SelfUpdate\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Pádraic Brady",
-                    "email": "padraic.brady@gmail.com",
-                    "homepage": "http://blog.astrumfutura.com"
-                }
-            ],
-            "description": "A thing to make PHAR self-updating easy and secure.",
-            "keywords": [
-                "humbug",
-                "phar",
-                "self-update",
-                "update"
-            ],
-            "time": "2016-01-05T23:08:01+00:00"
-        },
-        {
-            "name": "padraic/phpunit-accelerator",
-            "version": "v1.0.2",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/padraic/phpunit-accelerator.git",
-                "reference": "0b3b58e6e9a794eec22df712776058850d5fe0c1"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/padraic/phpunit-accelerator/zipball/0b3b58e6e9a794eec22df712776058850d5fe0c1",
-                "reference": "0b3b58e6e9a794eec22df712776058850d5fe0c1",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.3",
-                "phpunit/phpunit": ">=3.7"
-            },
-            "replace": {
-                "mybuilder/phpunit-accelerator": "1.0.x"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "MyBuilder\\PhpunitAccelerator\\": "src"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Keyvan Akbary",
-                    "email": "keyvan@mybuilder.com",
-                    "role": "Developer"
-                },
-                {
-                    "name": "Padraic Brady",
-                    "email": "padraic.brady@gmail.com",
-                    "role": "Contributor"
-                }
-            ],
-            "description": "PHPUnit Accelerator: Speeds up PHPUnit by freeing memory after test runs",
-            "keywords": [
-                "accelerator",
-                "fast",
-                "free",
-                "memory",
-                "phpunit",
-                "property"
-            ],
-            "time": "2015-01-15T21:18:21+00:00"
-        },
-        {
-            "name": "padraic/phpunit-extensions",
-            "version": "1.0.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/padraic/phpunit-extensions.git",
-                "reference": "a6942fa3ada5487e1b9a409c235013a677c2689b"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/padraic/phpunit-extensions/zipball/a6942fa3ada5487e1b9a409c235013a677c2689b",
-                "reference": "a6942fa3ada5487e1b9a409c235013a677c2689b",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.4.0",
-                "phpunit/phpunit": "^4.0|^5.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.0-dev"
-                }
-            },
-            "autoload": {
-                "psr-0": {
-                    "Humbug\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "BSD-3-Clause"
-            ],
-            "authors": [
-                {
-                    "name": "Pádraic Brady",
-                    "email": "padraic.brady@gmail.com",
-                    "homepage": "http://blog.astrumfutura.com"
-                }
-            ],
-            "description": "Collection of Listeners to log and manipulate test run order",
-            "keywords": [
-                "extension",
-                "humbug",
-                "listener",
-                "phpunit",
-                "testing",
-                "tests"
-            ],
-            "time": "2016-01-06T12:16:20+00:00"
+            "time": "2017-01-26T22:05:40+00:00"
         },
         {
             "name": "phake/phake",
@@ -1057,40 +785,39 @@
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "4.0.4",
+            "version": "5.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "c14196e64a78570034afd0b7a9f3757ba71c2a0a"
+                "reference": "3f10a2c8eed68b29cbbb54e29cc58cb31b077553"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/c14196e64a78570034afd0b7a9f3757ba71c2a0a",
-                "reference": "c14196e64a78570034afd0b7a9f3757ba71c2a0a",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/3f10a2c8eed68b29cbbb54e29cc58cb31b077553",
+                "reference": "3f10a2c8eed68b29cbbb54e29cc58cb31b077553",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.6 || ^7.0",
-                "phpunit/php-file-iterator": "~1.3",
-                "phpunit/php-text-template": "~1.2",
-                "phpunit/php-token-stream": "^1.4.2",
-                "sebastian/code-unit-reverse-lookup": "~1.0",
-                "sebastian/environment": "^1.3.2 || ^2.0",
-                "sebastian/version": "~1.0|~2.0"
+                "php": "^7.0",
+                "phpunit/php-file-iterator": "^1.3",
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-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.5.9"
-            },
-            "require-dev": {
-                "psr/log": "~1.0",
-                "symfony/config": "~2.8|~3.0",
-                "symfony/dependency-injection": "~2.8|~3.0",
-                "symfony/expression-language": "~2.8|~3.0",
-                "symfony/stopwatch": "~2.8|~3.0"
-            },
-            "suggest": {
-                "symfony/dependency-injection": "",
-                "symfony/http-kernel": ""
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "3.2-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Component\\EventDispatcher\\": ""
-                },
-                "exclude-from-classmap": [
-                    "/Tests/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Fabien Potencier",
-                    "email": "fabien@symfony.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony EventDispatcher Component",
-            "homepage": "https://symfony.com",
-            "time": "2016-10-13T06:29:04+00:00"
-        },
-        {
-            "name": "symfony/finder",
-            "version": "v3.2.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/finder.git",
-                "reference": "a69cb5d455b4885ca376dc5bb3e1155cc8c08c4b"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/finder/zipball/a69cb5d455b4885ca376dc5bb3e1155cc8c08c4b",
-                "reference": "a69cb5d455b4885ca376dc5bb3e1155cc8c08c4b",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.5.9"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "3.2-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Component\\Finder\\": ""
-                },
-                "exclude-from-classmap": [
-                    "/Tests/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Fabien Potencier",
-                    "email": "fabien@symfony.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony Finder Component",
-            "homepage": "https://symfony.com",
-            "time": "2016-12-13T09:39:43+00:00"
-        },
-        {
-            "name": "symfony/polyfill-mbstring",
-            "version": "v1.3.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "e79d363049d1c2128f133a2667e4f4190904f7f4"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/e79d363049d1c2128f133a2667e4f4190904f7f4",
-                "reference": "e79d363049d1c2128f133a2667e4f4190904f7f4",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.3"
-            },
-            "suggest": {
-                "ext-mbstring": "For best performance"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.3-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Polyfill\\Mbstring\\": ""
-                },
-                "files": [
-                    "bootstrap.php"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Nicolas Grekas",
-                    "email": "p@tchwork.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony polyfill for the Mbstring extension",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "mbstring",
-                "polyfill",
-                "portable",
-                "shim"
-            ],
-            "time": "2016-11-14T01:06:16+00:00"
-        },
-        {
-            "name": "symfony/process",
-            "version": "v3.2.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/process.git",
-                "reference": "02ea84847aad71be7e32056408bb19f3a616cdd3"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/process/zipball/02ea84847aad71be7e32056408bb19f3a616cdd3",
-                "reference": "02ea84847aad71be7e32056408bb19f3a616cdd3",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.5.9"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "3.2-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Component\\Process\\": ""
-                },
-                "exclude-from-classmap": [
-                    "/Tests/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Fabien Potencier",
-                    "email": "fabien@symfony.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony Process Component",
-            "homepage": "https://symfony.com",
-            "time": "2016-11-24T10:40:28+00:00"
-        },
-        {
-            "name": "symfony/yaml",
-            "version": "v3.2.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/yaml.git",
-                "reference": "a7095af4b97a0955f85c8989106c249fa649011f"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/a7095af4b97a0955f85c8989106c249fa649011f",
-                "reference": "a7095af4b97a0955f85c8989106c249fa649011f",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.5.9"
-            },
-            "require-dev": {
-                "symfony/console": "~2.8|~3.0"
-            },
-            "suggest": {
-                "symfony/console": "For validating YAML files using the lint command"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "3.2-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Component\\Yaml\\": ""
-                },
-                "exclude-from-classmap": [
-                    "/Tests/"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Fabien Potencier",
-                    "email": "fabien@symfony.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony Yaml Component",
-            "homepage": "https://symfony.com",
-            "time": "2016-12-10T10:07:06+00:00"
+            "time": "2017-02-02T03:30:00+00:00"
         },
         {
             "name": "webmozart/assert",
diff --git a/humbug.json.dist b/humbug.json.dist
deleted file mode 100644
index 1264c49..0000000
--- a/humbug.json.dist
+++ /dev/null
@@ -1,12 +0,0 @@
-{
-    "source": {
-        "directories": [
-            "src"
-        ]
-    },
-    "timeout": 10,
-    "logs": {
-        "text": "humbuglog.txt",
-        "json": "humbuglog.json"
-    }
-}
\ No newline at end of file
diff --git a/src/ErrorTrait.php b/src/ErrorTrait.php
new file mode 100644
index 0000000..2cbd25c
--- /dev/null
+++ b/src/ErrorTrait.php
@@ -0,0 +1,21 @@
+<?php declare(strict_types=1);
+
+namespace ApiClients\Foundation\Middleware;
+
+use Throwable;
+use React\Promise\CancellablePromiseInterface;
+
+use function React\Promise\reject;
+
+trait ErrorTrait
+{
+    /**
+     * @param Throwable $throwable
+     * @param array $options
+     * @return CancellablePromiseInterface
+     */
+    public function error(Throwable $throwable, array $options = []): CancellablePromiseInterface
+    {
+        return reject($throwable);
+    }
+}
diff --git a/src/MiddlewareInterface.php b/src/MiddlewareInterface.php
index 36f4c53..00ff8ae 100644
--- a/src/MiddlewareInterface.php
+++ b/src/MiddlewareInterface.php
@@ -5,6 +5,7 @@
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
 use React\Promise\CancellablePromiseInterface;
+use Throwable;
 
 /**
  * Middleware, when a new request is made an instance specifically for that request is made for each request.
@@ -38,4 +39,14 @@ public function pre(RequestInterface $request, array $options = []): Cancellable
      * @return CancellablePromiseInterface
      */
     public function post(ResponseInterface $response, array $options = []): CancellablePromiseInterface;
+
+    /**
+     * Transform the throwable into another throwable or exception,
+     * but never turn it into a successful promise again.
+     *
+     * @param Throwable $throwable
+     * @param array $options
+     * @return CancellablePromiseInterface
+     */
+    public function error(Throwable $throwable, array $options = []): CancellablePromiseInterface;
 }
diff --git a/src/MiddlewareRunner.php b/src/MiddlewareRunner.php
index d946b46..854aeae 100644
--- a/src/MiddlewareRunner.php
+++ b/src/MiddlewareRunner.php
@@ -5,6 +5,8 @@
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
 use React\Promise\CancellablePromiseInterface;
+use Throwable;
+use function React\Promise\reject;
 use function React\Promise\resolve;
 
 final class MiddlewareRunner
@@ -84,4 +86,26 @@ public function post(
 
         return $promise;
     }
+
+    /**
+     * @param Throwable $throwable
+     * @return CancellablePromiseInterface
+     */
+    public function error(
+        Throwable $throwable
+    ): CancellablePromiseInterface {
+
+        $promise = reject($throwable);
+
+        $this->middlewares = array_reverse($this->middlewares);
+
+        foreach ($this->middlewares as $middleware) {
+            $errorMiddleware = $middleware;
+            $promise = $promise->then(null, function (Throwable $throwable) use ($errorMiddleware) {
+                return reject($errorMiddleware->error($throwable, $this->options));
+            });
+        }
+
+        return $promise;
+    }
 }
diff --git a/tests/DummyMiddleware.php b/tests/DummyMiddleware.php
index 8041ba1..3837812 100644
--- a/tests/DummyMiddleware.php
+++ b/tests/DummyMiddleware.php
@@ -4,6 +4,7 @@
 namespace ApiClients\Tests\Foundation\Middleware;
 
 use ApiClients\Foundation\Middleware\DefaultPriorityTrait;
+use ApiClients\Foundation\Middleware\ErrorTrait;
 use ApiClients\Foundation\Middleware\MiddlewareInterface;
 use ApiClients\Foundation\Middleware\PostTrait;
 use ApiClients\Foundation\Middleware\PreTrait;
@@ -13,4 +14,5 @@ class DummyMiddleware implements MiddlewareInterface
     use DefaultPriorityTrait;
     use PreTrait;
     use PostTrait;
+    use ErrorTrait;
 }
diff --git a/tests/DummyMiddlewareTest.php b/tests/DummyMiddlewareTest.php
index 84e0a64..e140b1d 100644
--- a/tests/DummyMiddlewareTest.php
+++ b/tests/DummyMiddlewareTest.php
@@ -1,13 +1,13 @@
-<?php
-declare(strict_types=1);
+<?php declare(strict_types=1);
 
 namespace ApiClients\Tests\Foundation\Middleware;
 
 use ApiClients\Tools\TestUtilities\TestCase;
-use function Clue\React\Block\await;
+use Exception;
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
 use React\EventLoop\Factory;
+use function Clue\React\Block\await;
 
 class DummyMiddlewareTest extends TestCase
 {
@@ -45,4 +45,16 @@ public function testPost()
             )
         );
     }
+
+    public function testError()
+    {
+        $middleware = new DummyMiddleware();
+        $exception = new Exception('Throwable or anything extending it');
+        self::expectException(Exception::class);
+        self::expectExceptionMessage('Throwable or anything extending it');
+        await(
+            $middleware->error($exception),
+            Factory::create()
+        );
+    }
 }
diff --git a/tests/Locator/ContainerLocatorTest.php b/tests/Locator/ContainerLocatorTest.php
index 8ceb075..e863829 100644
--- a/tests/Locator/ContainerLocatorTest.php
+++ b/tests/Locator/ContainerLocatorTest.php
@@ -4,9 +4,10 @@
 
 use ApiClients\Foundation\Middleware\Locator\ContainerLocator;
 use ApiClients\Tests\Foundation\Middleware\DummyMiddleware;
+use ApiClients\Tools\TestUtilities\TestCase;
 use Interop\Container\ContainerInterface;
 
-class ContainerLocatorTest extends \PHPUnit_Framework_TestCase
+class ContainerLocatorTest extends TestCase
 {
     public function testGetSuccess()
     {
diff --git a/tests/MiddlewareRunnerTest.php b/tests/MiddlewareRunnerTest.php
index 0fc4345..b292be5 100644
--- a/tests/MiddlewareRunnerTest.php
+++ b/tests/MiddlewareRunnerTest.php
@@ -2,13 +2,15 @@
 
 namespace ApiClients\Tests\Foundation\Middleware;
 
-use ApiClients\Foundation\Middleware\MiddlewareRunner;
 use ApiClients\Foundation\Middleware\MiddlewareInterface;
+use ApiClients\Foundation\Middleware\MiddlewareRunner;
 use ApiClients\Tools\TestUtilities\TestCase;
-use function Clue\React\Block\await;
+use Exception;
 use GuzzleHttp\Psr7\Request;
 use GuzzleHttp\Psr7\Response;
 use Phake;
+use function Clue\React\Block\await;
+use function React\Promise\reject;
 use function React\Promise\resolve;
 
 class MiddlewareRunnerTest extends TestCase
@@ -17,22 +19,26 @@ public function testAll()
     {
         $request = new Request('GET', 'https://example.com/');
         $response = new Response(200);
+        $exception = new Exception();
         $options = [];
 
         $middlewareOne = Phake::mock(MiddlewareInterface::class);
         Phake::when($middlewareOne)->priority()->thenReturn(1000);
         Phake::when($middlewareOne)->pre($request, $options)->thenReturn(resolve($request));
         Phake::when($middlewareOne)->post($response, $options)->thenReturn(resolve($response));
+        Phake::when($middlewareOne)->error($exception, $options)->thenReturn(reject($exception));
 
         $middlewareTwo = Phake::mock(MiddlewareInterface::class);
         Phake::when($middlewareTwo)->priority()->thenReturn(500);
         Phake::when($middlewareTwo)->pre($request, $options)->thenReturn(resolve($request));
         Phake::when($middlewareTwo)->post($response, $options)->thenReturn(resolve($response));
+        Phake::when($middlewareTwo)->error($exception, $options)->thenReturn(reject($exception));
 
         $middlewareThree = Phake::mock(MiddlewareInterface::class);
         Phake::when($middlewareThree)->priority()->thenReturn(0);
         Phake::when($middlewareThree)->pre($request, $options)->thenReturn(resolve($request));
         Phake::when($middlewareThree)->post($response, $options)->thenReturn(resolve($response));
+        Phake::when($middlewareThree)->error($exception, $options)->thenReturn(reject($exception));
 
         $args = [
             $options,
@@ -44,6 +50,7 @@ public function testAll()
         $executioner = new MiddlewareRunner(...$args);
         $executioner->pre($request);
         $executioner->post($response);
+        $executioner->error($exception);
 
         Phake::inOrder(
             Phake::verify($middlewareOne)->pre($request, $options),
@@ -51,7 +58,10 @@ public function testAll()
             Phake::verify($middlewareThree)->pre($request, $options),
             Phake::verify($middlewareThree)->post($response, $options),
             Phake::verify($middlewareTwo)->post($response, $options),
-            Phake::verify($middlewareOne)->post($response, $options)
+            Phake::verify($middlewareOne)->post($response, $options),
+            Phake::verify($middlewareOne)->error($exception, $options),
+            Phake::verify($middlewareTwo)->error($exception, $options),
+            Phake::verify($middlewareThree)->error($exception, $options)
         );
     }
 }