--- a/torch/csrc/distributed/c10d/control_plane/WorkerServer.cpp	2026-09-18 13:16:02.333994098 +0200
+++ b/torch/csrc/distributed/c10d/control_plane/WorkerServer.cpp	2026-09-18 13:18:25.083555926 +0200
@@ -20,12 +20,17 @@
   }
 
   const std::multimap<std::string, std::string>& params() const override {
-    return req_.params;
+    cached_params_.clear();
+    for (const auto& pair : req_.params) {
+    	cached_params_.insert(pair);
+    }
+    return cached_params_;
   }
 
  private:
   // NOLINTNEXTLINE(cppcoreguidelines-avoid-const-or-ref-data-members)
   const httplib::Request& req_;
+  mutable std::multimap<std::string, std::string> cached_params_;
 };
 
 class ResponseImpl : public Response {