diff --git a/src/Cookies.php b/src/Cookies.php
index 02d4e3c..894bdb1 100644
--- a/src/Cookies.php
+++ b/src/Cookies.php
@@ -170,7 +170,10 @@ protected function toHeader(string $name, array $properties): string
             $result .= '; HttpOnly';
         }
 
-        if (isset($properties['samesite']) && in_array(strtolower($properties['samesite']), ['lax', 'strict', 'none'], true)) {
+        if (
+            isset($properties['samesite'])
+            && in_array(strtolower($properties['samesite']), ['lax', 'strict', 'none'], true)
+        ) {
             // While strtolower is needed for correct comparison, the RFC doesn't care about case
             $result .= '; SameSite=' . $properties['samesite'];
         }
diff --git a/src/Uri.php b/src/Uri.php
index 2dedd01..a22f38e 100644
--- a/src/Uri.php
+++ b/src/Uri.php
@@ -484,7 +484,20 @@ public function __toString(): string
         $query = $this->getQuery();
         $fragment = $this->getFragment();
 
-        $path = '/' . ltrim($path, '/');
+        if ($path !== '') {
+            if ($path[0] !== '/') {
+                if ($authority !== '') {
+                    // If the path is rootless and an authority is present, the path MUST be prefixed by "/".
+                    $path = '/' . $path;
+                }
+            } elseif (isset($path[1]) && $path[1] === '/') {
+                if ($authority === '') {
+                    // If the path is starting with more than one "/" and no authority is present,
+                    // the starting slashes MUST be reduced to one.
+                    $path = '/' . ltrim($path, '/');
+                }
+            }
+        }
 
         return ($scheme !== '' ? $scheme . ':' : '')
             . ($authority !== '' ? '//' . $authority : '')