fix: create correct uri on retry

classes/api/package_api.php

@@ -207,7 +207,7 @@ public function download_static_file(string $namespace, string $shortname, strin
     /**
      * Send a POST request and retry if the server doesn't have the package file cached, but we have it available.
      *
-     * @param string $uri can be absolute or relative to the base url
+     * @param string $uri relative to the base url
      * @param array $options request options as per
      *                       {@link https://docs.guzzlephp.org/en/stable/request-options.html Guzzle docs}
      * @param bool $allowretry if set to false, retry won't be attempted if the package file isn't cached, instead
@@ -217,10 +217,10 @@ public function download_static_file(string $namespace, string $shortname, strin
      * @throws request_error
      */
     private function post_and_maybe_retry(string $uri, array $options = [], bool $allowretry = true): ResponseInterface {
-        $uri = "/packages/$this->hash/" . ltrim($uri, '/');
+        $fulluri = "/packages/$this->hash/" . ltrim($uri, '/');
 
         try {
-            return $this->client->post($uri, $options);
+            return $this->client->post($fulluri, $options);
         } catch (request_error $e) {
             if (!$allowretry || !$this->file || $e->requesterrorcode !== error_code::package_not_found) {
                 throw $e;