Make sure we vary on the Authorization header

Author: Nyholm

composer.json

@@ -24,7 +24,7 @@
         "php-http/discovery": "^1.0",
         "php-http/client-implementation": "^1.0",
         "php-http/client-common": "^1.3",
-        "php-http/cache-plugin": "^1.3"
+        "php-http/cache-plugin": "^1.4"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.0 || ^5.5",

lib/Github/HttpClient/Builder.php

@@ -13,6 +13,7 @@
 use Http\Message\RequestFactory;
 use Http\Message\StreamFactory;
 use Psr\Cache\CacheItemPoolInterface;
+use Http\Client\Common\Plugin\Cache\Generator\VaryGenerator;
 
 /**
  * A builder that builds the API client.
@@ -181,6 +182,9 @@ public function addHeaderValue($header, $headerValue)
      */
     public function addCache(CacheItemPoolInterface $cachePool, array $config = [])
     {
+        if (!isset($config['cache_key_generator'])) {
+            $config['cache_key_generator'] = new VaryGenerator(['Authorization']);
+        }
         $this->cachePlugin = Plugin\CachePlugin::clientCache($cachePool, $this->streamFactory, $config);
         $this->httpClientModified = true;
     }