Update pytest_httpserver/httpserver.py

Co-authored-by: Hayao <hayao_s@tokyo-gas.co.jp>

Author: csernazs

pytest_httpserver/httpserver.py

@@ -998,7 +998,7 @@ def wait_for_server_ready(self) -> None:
 
         url = self.url_for("/")
         if not url.startswith(("http://", "https://")):
-            raise ValueError(f"Invalid URL generated for readiness check check: {url}")  # noqa: EM102
+            raise ValueError(f"Invalid URL generated for readiness check : {url}")  # noqa: EM102
 
         with urllib.request.urlopen(url, timeout=self.startup_timeout) as resp:  # noqa: S310
             if resp.status != 200 or resp.read() != b"OK":