diff --git a/components/HttpClient/Middleware/class-httpmiddleware.php b/components/HttpClient/Middleware/class-httpmiddleware.php
index 3af226b4..715517ca 100644
--- a/components/HttpClient/Middleware/class-httpmiddleware.php
+++ b/components/HttpClient/Middleware/class-httpmiddleware.php
@@ -4,11 +4,8 @@
 
 use WordPress\HttpClient\Client;
 use WordPress\HttpClient\ClientState;
-use WordPress\HttpClient\HttpClientException;
 use WordPress\HttpClient\Request;
 use WordPress\HttpClient\Connection;
-use WordPress\HttpClient\Transport\CurlTransport;
-use WordPress\HttpClient\Transport\SocketTransport;
 use WordPress\HttpClient\Transport\TransportInterface;
 
 class HttpMiddleware implements MiddlewareInterface {
@@ -42,7 +39,7 @@ public function __construct( $client_state, $options = array() ) {
 	 */
 	public function enqueue( Request $request ) {
 		$request->state                           = Request::STATE_ENQUEUED;
-		$this->state->requests[]                  = apply_filters( 'wp_http_client_request', $request );
+		$this->state->requests[]                  = $request;
 		$this->state->events[ $request->id ]      = array();
 		$this->state->connections[ $request->id ] = new Connection( $request );
 	}
diff --git a/components/HttpClient/class-client.php b/components/HttpClient/class-client.php
index 9b73710c..e87a612c 100644
--- a/components/HttpClient/class-client.php
+++ b/components/HttpClient/class-client.php
@@ -139,8 +139,16 @@ public function enqueue( $requests ) {
 				throw new HttpClientException( sprintf( 'Request %s is not in the created state.', esc_html( $request->id ) ) );
 			}
 
-			$this->middleware->enqueue( $request );
+			$filtered_request = apply_filters( 'wp_http_client_request_before_enqueue', $request );
 
+			$this->middleware->enqueue( $filtered_request ? $filtered_request : $request );
+
+			if ( false === $filtered_request ) {
+				$this->state->set_request_error( $request, new HttpError( sprintf( 'Request %s was rejected by a filter and not enqueued.', esc_html( $request->id ) ) ) );
+				continue;
+			}
+
+			$request = $filtered_request;
 			$parsed = WPURL::parse( $request->url );
 			if ( false === $parsed ) {
 				$this->state->set_request_error( $request, new HttpError( sprintf( 'Invalid URL: %s', $request->url ) ) );
diff --git a/plugins/data-liberation/plugin.php b/plugins/data-liberation/plugin.php
index 58c613c9..8a979d83 100644
--- a/plugins/data-liberation/plugin.php
+++ b/plugins/data-liberation/plugin.php
@@ -120,7 +120,7 @@ function () {
  * Git repositories.
  */
 add_filter(
-	'wp_http_client_request',
+	'wp_http_client_request_before_enqueue',
 	function ( Request $request ) {
 		if ( isset( $request->headers['x-cors-proxy-allowed-request-headers'] ) ) {
 			$prefix = $request->headers['x-cors-proxy-allowed-request-headers'] . ',';