diff --git a/common/http_fetcher.h b/common/http_fetcher.h
index 9f81879..fb15689 100644
--- a/common/http_fetcher.h
+++ b/common/http_fetcher.h
@@ -134,6 +134,11 @@
   ProxyResolver* proxy_resolver() const { return proxy_resolver_; }
 
  protected:
+  // Cancels a proxy resolution in progress. The callback passed to
+  // ResolveProxiesForUrl() will not be called. Returns whether there was a
+  // pending proxy resolution to be canceled.
+  bool CancelProxyResolution();
+
   // The URL we're actively fetching from
   std::string url_;
 
@@ -170,6 +175,10 @@
   // |proxy_resolver_|.
   void NoProxyResolverCallback();
 
+  // Stores the ongoing proxy request id if there is one, otherwise
+  // kProxyRequestIdNull.
+  ProxyRequestId proxy_request_{kProxyRequestIdNull};
+
   DISALLOW_COPY_AND_ASSIGN(HttpFetcher);
 };