diff --git a/lib/private/Http/Client/Client.php b/lib/private/Http/Client/Client.php
index 8501b41c06d97..6a13c7c1b2f61 100644
--- a/lib/private/Http/Client/Client.php
+++ b/lib/private/Http/Client/Client.php
@@ -19,6 +19,8 @@
 use OCP\IConfig;
 use OCP\Security\IRemoteHostValidator;
 use OCP\ServerVersion;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
 use Psr\Log\LoggerInterface;
 use function parse_url;
 
@@ -477,6 +479,21 @@ public function request(string $method, string $uri, array $options = []): IResp
 		return new Response($response, $isStream);
 	}
 
+	/**
+	 * Sends a PSR-7 request and returns a PSR-7 response, part of the PSR-18 interface.
+	 * This is a thin wrapper arround the Guzzle Client implementation
+	 *
+	 * @param RequestInterface $request PSR-7 request interface
+	 *
+	 * @return ResponseInterface PSR-7 response interface
+	 *
+	 * @throws \Psr\Http\Client\ClientExceptionInterface If an error happens while processing the request.
+	 */
+	public function sendRequest(RequestInterface $request): ResponseInterface {
+		$this->preventLocalAddress((string)$request->getUri(), []);
+		return $this->client->sendRequest($request);
+	}
+
 	protected function wrapGuzzlePromise(PromiseInterface $promise): IPromise {
 		return new GuzzlePromiseAdapter(
 			$promise,
diff --git a/lib/public/Http/Client/IClient.php b/lib/public/Http/Client/IClient.php
index e4f46d44e4dfa..7c86ff56fb3e2 100644
--- a/lib/public/Http/Client/IClient.php
+++ b/lib/public/Http/Client/IClient.php
@@ -8,12 +8,16 @@
  */
 namespace OCP\Http\Client;
 
+use Psr\Http\Client\ClientInterface;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
 /**
  * Interface IClient
  *
  * @since 8.1.0
  */
-interface IClient {
+interface IClient extends ClientInterface {
 
 	/**
 	 * Default request timeout for requests
@@ -268,6 +272,17 @@ public function getResponseFromThrowable(\Throwable $e): IResponse;
 	 */
 	public function request(string $method, string $uri, array $options = []): IResponse;
 
+	/**
+	 * Sends a PSR-7 request and returns a PSR-7 response, part of the PSR-18 interface.
+	 *
+	 * @param RequestInterface $request PSR-7 request interface
+	 *
+	 * @return ResponseInterface PSR-7 response interface
+	 *
+	 * @throws \Psr\Http\Client\ClientExceptionInterface If an error happens while processing the request.
+	 */
+	public function sendRequest(RequestInterface $request): ResponseInterface;
+
 	/**
 	 * Sends an asynchronous GET request
 	 * @param string $uri