diff --git a/src/Adapter/Rest.php b/src/Adapter/Rest.php
index c166ed9..f04b949 100644
--- a/src/Adapter/Rest.php
+++ b/src/Adapter/Rest.php
@@ -50,7 +50,7 @@ class Rest implements AdapterInterface
         return "https";
     }
 
-    public function writableValue(mixed  $value) : mixed
+    public function writableValue(mixed $value) : mixed
     {
         switch (true) {
             case $value instanceof \UnitEnum:
diff --git a/src/ApiRepository.php b/src/ApiRepository.php
index b6fb183..84a2b3e 100644
--- a/src/ApiRepository.php
+++ b/src/ApiRepository.php
@@ -40,9 +40,7 @@ class ApiRepository extends \Ulmus\Repository
 
     public function loadOneFromAttribute(string $attributeClass): ? object
     {
-        $response = $this->executeRequest($attributeClass);
-
-        return $this->instanciateEntity()->fromArray($response->getParsedBody());
+        return $this->instanciateEntity(null, $this->executeRequest($attributeClass)->getParsedBody());
     }
 
     public function loadAll() : EntityCollection
@@ -96,6 +94,10 @@ class ApiRepository extends \Ulmus\Repository
             throw new \RuntimeException(sprintf("Could not find attribute class '%s' for class '%s'", $attributeClass, $this->entityClass));
         }
 
+        if (method_exists($this->adapter->apiHandler, 'executingRequest')) {
+            $this->adapter->apiHandler->executingRequest($this, $attribute);
+        }
+
         $request = $this->prepareRequest($this->buildRequestUrl($attribute->url), $attribute->method, $data, $this->adapter->adapter()->getHeaders(), $this->adapter->adapter()->getParameters());
 
         $request = $this->compileRequestParameters($request, $attribute);
@@ -170,7 +172,8 @@ class ApiRepository extends \Ulmus\Repository
         $request = new JsonRequest($uri, $method, $body === null ? Stream::fromTemp() : JsonStream::fromContent($body), $headers);
 
         # Adding parameters
-        $request = $request->withQueryParams($queryParameters);
+        $request = $request->withQueryParams($queryParameters)
+            ->withAttribute('repository', $this);
 
         return $request;
     }
diff --git a/src/Common/ContentTypeEnum.php b/src/Common/ContentTypeEnum.php
index 52d8934..e84bd99 100644
--- a/src/Common/ContentTypeEnum.php
+++ b/src/Common/ContentTypeEnum.php
@@ -5,8 +5,10 @@ namespace Ulmus\Api\Common;
 enum ContentTypeEnum : string
 {
     case Json = "application/json";
-    case Multipart = "multipart/form-data";
+    case Xml = "application/xml";
+    case RssXml = "application/rss+xml";
     case UrlEncoded = "application/x-www-form-urlencoded";
+    case Multipart = "multipart/form-data";
 
     public function defaultBody() : string
     {
diff --git a/src/Common/XmlMessageTrait.php b/src/Common/XmlMessageTrait.php
new file mode 100644
index 0000000..deb741a
--- /dev/null
+++ b/src/Common/XmlMessageTrait.php
@@ -0,0 +1,23 @@
+<?php
+
+namespace Ulmus\Api\Common;
+
+use Psr\Http\Message\MessageInterface;
+use Ulmus\Api\Stream\JsonStream;
+use Ulmus\Api\Stream\XmlStream;
+
+# @TODO !
+trait XmlMessageTrait
+{
+    public function getParsedBody() : null|array|object
+    {
+        return XmlStream::fromXmlEncoded( $this->getBody()->getContents() )->decode() ;
+    }
+
+    public function withParsedBody(mixed $data) : static
+    {
+        return (clone $this)->setBody(
+            XmlStream::fromContent($data)
+        );
+    }
+}
\ No newline at end of file
diff --git a/src/Request/Request.php b/src/Request/Request.php
index de1e99c..ee7369d 100644
--- a/src/Request/Request.php
+++ b/src/Request/Request.php
@@ -22,6 +22,8 @@ class Request extends Message implements ServerRequestInterface
 
     protected array $files = [];
 
+    protected array $attributes = [];
+
     public function __construct(string|UriInterface $uri, MethodEnum $method, null|StreamInterface $stream = null, array $headers = [])
     {
         $this->method = $method;
@@ -197,21 +199,25 @@ class Request extends Message implements ServerRequestInterface
 
     public function getAttributes() : array
     {
-        // TODO: Implement getAttributes() method.
+        return $this->attributes;
     }
 
     public function getAttribute($name, $default = null) : mixed
     {
-        // TODO: Implement getAttribute() method.
+        return array_key_exists($name, $this->attributes) ? $this->attributes[$name] : $default;
     }
 
     public function withAttribute($name, $value) : static
     {
-        // TODO: Implement withAttribute() method.
+        $this->attributes[$name] = $value;
+
+        return $this;
     }
 
     public function withoutAttribute($name): static
     {
-        // TODO: Implement withoutAttribute() method.
+        unset($this->attributes[$name]);
+
+        return $this;
     }
 }
diff --git a/src/Response/XmlResponse.php b/src/Response/XmlResponse.php
new file mode 100644
index 0000000..e8947d1
--- /dev/null
+++ b/src/Response/XmlResponse.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace Ulmus\Api\Response;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+use Ulmus\Api\Common\XmlMessageTrait;
+use Ulmus\Api\Stream\XmlStream;
+use Ulmus\Api\Common\StreamOutputInterface;
+
+class XmlResponse extends Response implements StreamOutputInterface
+{
+    use XmlMessageTrait;
+
+    public function __construct(null|StreamInterface $stream = null, int $statusCode = 200, array $headers = [])
+    {
+        parent::__construct($stream, $statusCode, $headers + [ 'Content-Type' => "application/xml" ]);
+    }
+
+    public static function fromResponse(ResponseInterface $response) : static
+    {
+        return new static($response->getBody(), $response->getStatusCode(), $response->getHeaders());
+    }
+
+    public static function createFrom(mixed $content) : ResponseInterface
+    {
+        return new static(XmlStream::fromContent($content));
+    }
+}
\ No newline at end of file
diff --git a/src/Stream/XmlStream.php b/src/Stream/XmlStream.php
new file mode 100644
index 0000000..26f2183
--- /dev/null
+++ b/src/Stream/XmlStream.php
@@ -0,0 +1,49 @@
+<?php
+
+namespace Ulmus\Api\Stream;
+
+use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
+use Ulmus\Api\Common\HttpHeaderEnum;
+use Ulmus\Api\Stream\Stream;
+use Ulmus\Api\Common\StreamOutputInterface;
+
+# @TODO
+class XmlStream extends Stream
+{
+
+    public function __construct()
+    {
+    }
+
+    public static function fromContent(mixed $content) : StreamInterface
+    {
+        #if ( false === $json = json_encode($content) ) {
+        #    throw new \InvalidArgumentException(sprintf('Json encoding failed with message `%s`.', json_last_error_msg()));
+       # }
+
+        # @TODO !
+
+        #return static::fromJsonEncoded($json);
+        return static::fromXmlEncoded($content);
+    }
+
+    public static function fromXmlEncoded(string $xml) : StreamInterface
+    {
+        $obj = static::fromTemp($xml);
+        $obj->rewind();
+
+        return $obj;
+    }
+
+    public function decode(): mixed
+    {
+        $content = $this->getContents();
+
+        if ($content === "") {
+            return null;
+        }
+
+        return json_decode(json_encode((array) \simplexml_load_string($content)), true);
+    }
+}
\ No newline at end of file
diff --git a/src/Transport/CurlAuthorization.php b/src/Transport/CurlAuthorization.php
index 258d85a..6611762 100644
--- a/src/Transport/CurlAuthorization.php
+++ b/src/Transport/CurlAuthorization.php
@@ -18,6 +18,10 @@ class CurlAuthorization
     public function fromAuthenticationEnum(AuthenticationEnum $auth,) : static
     {
         switch($auth) {
+            case AuthenticationEnum::Custom:
+                $this->customHeader($this->configuration['header'], $this->configuration['secret']);
+                break;
+
             case AuthenticationEnum::Bearer:
                 $this->bearer($this->configuration['token']);
                 break;
@@ -96,6 +100,11 @@ class CurlAuthorization
         $this->userpass(CURLAUTH_NEGOTIATE, $username, $password);
     }
 
+    public function customHeader(string $header, #[\SensitiveParameter] string $token) : void
+    {
+        $this->headers[$header] = $token;
+    }
+
     public function oauth2(Oauth2GrantTypeEnum $grant, string $oauthTokenUrl, string $redirectUri, string $clientId, string $clientSecret, string $scope) : void
     {
         $unid = sprintf("oauth_token_%s", md5(serialize($this->configuration)));
diff --git a/src/Transport/CurlTransport.php b/src/Transport/CurlTransport.php
index f8c6dcc..e31691b 100644
--- a/src/Transport/CurlTransport.php
+++ b/src/Transport/CurlTransport.php
@@ -6,7 +6,7 @@ use Ulmus\Api\Common\{ ContentTypeEnum, MethodEnum, HttpHeaderEnum };
 use Ulmus\Api\Stream\JsonStream;
 use Ulmus\Api\Stream\Stream;
 use Psr\Http\Message\{RequestInterface, ResponseInterface, StreamInterface};
-use Ulmus\Api\Response\{ Response, JsonResponse };
+use Ulmus\Api\Response\{Response, JsonResponse, XmlResponse};
 
 abstract class CurlTransport {
 
@@ -37,9 +37,9 @@ abstract class CurlTransport {
         return $this->request(MethodEnum::Post, $url, $data, $headers, $curlOptions);
     }
 
-    public function get(string $url, mixed $data, array $headers = [], array $curlOptions = []) : mixed
+    public function get(string $url, array $headers = [], array $curlOptions = []) : mixed
     {
-        return $this->request(MethodEnum::Get, $url, $data, $headers, $curlOptions);
+        return $this->request(MethodEnum::Get, $url, null, $headers, $curlOptions);
     }
 
     public function delete(string $url, mixed $data, array $headers = [], array $curlOptions = []) : mixed
@@ -130,8 +130,14 @@ abstract class CurlTransport {
 
         $response = $response->withBody( Stream::fromMemory($result) );
 
-        if ( $response->hasHeader('Content-Type') && false !== strpos($response->getHeader('Content-Type')[0], 'json') ) {
-            $response = JsonResponse::fromResponse($response);
+        if ($response->hasHeader('Content-Type') ) {
+            list($mime) = explode(';', $response->getHeader('Content-Type')[0]);
+
+            return match(ContentTypeEnum::tryFrom($mime)) {
+                ContentTypeEnum::Json => JsonResponse::fromResponse($response),
+                ContentTypeEnum::RssXml, ContentTypeEnum::Xml => XmlResponse::fromResponse($response),
+                default => $response,
+            };
         }
 
         return $response;