diff --git a/src/Common/Error/Builder.php b/src/Common/Error/Builder.php
index a7033f2..7a50d2c 100644
--- a/src/Common/Error/Builder.php
+++ b/src/Common/Error/Builder.php
@@ -97,7 +97,7 @@ public function str(MessageInterface $message): string
             $msg .= "\r\n{$name}: " . implode(', ', $values);
         }
 
-        if ($message->getBody()->getSize() < ini_get('memory_limit')) {
+        if (ini_get('memory_limit') < 0 || $message->getBody()->getSize() < ini_get('memory_limit')) {
             $msg .= "\r\n\r\n" . $message->getBody();
         }
 
diff --git a/src/Common/Resource/AbstractResource.php b/src/Common/Resource/AbstractResource.php
index 892587d..ec119ef 100644
--- a/src/Common/Resource/AbstractResource.php
+++ b/src/Common/Resource/AbstractResource.php
@@ -82,7 +82,9 @@ public function populateFromArray(array $array): self
 
     private function parseDocBlockValue(string $type, $val)
     {
-        if (strpos($type, '[]') === 0 && is_array($val)) {
+        if (is_null($val)) {
+            return $val;
+        } elseif (strpos($type, '[]') === 0 && is_array($val)) {
             $array = [];
             foreach ($val as $subVal) {
                 $array[] = $this->model($this->normalizeModelClass(substr($type, 2)), $subVal);
diff --git a/src/Common/Service/Builder.php b/src/Common/Service/Builder.php
index 6a43bca..1791231 100644
--- a/src/Common/Service/Builder.php
+++ b/src/Common/Service/Builder.php
@@ -36,9 +36,10 @@ class Builder
     private $defaults = ['urlType' => 'publicURL'];
 
     /**
-     * @param array $globalOptions Options that will be applied to every service created by this builder.
-     *                             Eventually they will be merged (and if necessary overridden) by the
-     *                             service-specific options passed in.
+     * @param array  $globalOptions  Options that will be applied to every service created by this builder.
+     *                               Eventually they will be merged (and if necessary overridden) by the
+     *                               service-specific options passed in.
+     * @param string $rootNamespace  API classes' root namespace
      */
     public function __construct(array $globalOptions = [], $rootNamespace = 'OpenCloud')
     {
@@ -138,10 +139,16 @@ private function getStack(callable $authHandler, Token $token = null): HandlerSt
 
     private function httpClient(string $baseUrl, HandlerStack $stack): ClientInterface
     {
-        return new Client([
+        $clientOptions = [
             'base_uri' => Utils::normalizeUrl($baseUrl),
             'handler'  => $stack,
-        ]);
+        ];
+
+        if (isset($this->globalOptions['requestOptions'])) {
+            $clientOptions = array_merge($this->globalOptions['requestOptions'], $clientOptions);
+        }
+
+        return new Client($clientOptions);
     }
 
     private function mergeOptions(array $serviceOptions): array