Fix the GOD DAMN CORS

scripts/pyfa_sim.py

@@ -389,6 +389,10 @@ def _run_http_server(port: int, savepath: str | None) -> None:
         return json.dumps(body, indent=2) + "\n"
 
     class SimulateHandler(BaseHTTPRequestHandler):
+        def end_headers(self):
+            self.send_header("Access-Control-Allow-Origin", "*")
+            super().end_headers()
+
         def send_error(self, code: int, message: str | None = None, explain: str | None = None):
             msg = message or explain or "Error"
             self.send_response(code)
@@ -402,6 +406,13 @@ def _run_http_server(port: int, savepath: str | None) -> None:
             self.end_headers()
             self.wfile.write(send_error_json(code, msg, traceback_str).encode("utf-8"))
 
+        def do_OPTIONS(self):
+            self.send_response(204)
+            self.send_header("Access-Control-Allow-Methods", "POST, OPTIONS")
+            self.send_header("Access-Control-Allow-Headers", "Content-Type")
+            self.send_header("Access-Control-Max-Age", "86400")
+            self.end_headers()
+
         def do_GET(self):
             if self.path == "/simulate":
                 self._reply_error(405, "Method not allowed. Use POST.")