fix

server.py

@@ -42,11 +42,25 @@ print("跳转小红书首页成功，等待调用")
 
 
 def sign(uri, data, a1, web_session):
+  try:
+    # Ensure the page is still valid and reload if necessary
+    if context_page.is_closed():
+      global browser_context, context_page
+      browser_context, context_page = get_context_page(playwright, stealth_js_path)
+      context_page.goto("https://www.xiaohongshu.com")
+      time.sleep(5)
+      context_page.reload()
+      time.sleep(1)
+
+    # Evaluate the JavaScript function
     encrypt_params = context_page.evaluate("([url, data]) => window._webmsxyw(url, data)", [uri, data])
     return {
       "x-s": encrypt_params["X-s"],
       "x-t": str(encrypt_params["X-t"])
     }
+  except Exception as e:
+    print(f"Error during sign operation: {e}")
+    return {"error": str(e)}
 
 
 @app.route("/sign", methods=["POST"])