diff --git a/plugin/business/pangu-http/src/pangu_web_cache.cpp b/plugin/business/pangu-http/src/pangu_web_cache.cpp
index e0ccb48..ac39eef 100644
--- a/plugin/business/pangu-http/src/pangu_web_cache.cpp
+++ b/plugin/business/pangu-http/src/pangu_web_cache.cpp
@@ -440,7 +440,7 @@ char* get_cache_key(const struct tfe_http_half * request, const struct cache_key
 	}
 	char* url_no_qs=NULL;
 	const char* cookie=NULL;
-	char cookie_val[256]={0};	 //most 256 bytes for cookie key
+	char cookie_val[1024]={0};	 //most 1024 bytes for cookie key
 	
 	size_t key_size=strlen(request->req_spec.url)+sizeof(cookie_val);
 	char* cache_key=ALLOC(char, key_size);
@@ -460,8 +460,7 @@ char* get_cache_key(const struct tfe_http_half * request, const struct cache_key
 		cookie_scanvalue(desc->include_cookie, cookie, cookie_val, sizeof(cookie_val));
 		if(strlen(cookie_val)>0)
 		{
-			strncat(cache_key, "/C/", key_size);
-			strncat(cache_key, cookie_val, key_size);
+			snprintf(cache_key, key_size-strlen(cache_key), "/C/%s=%s", desc->include_cookie, cookie_val);
 		}
 	}
 	return cache_key;
@@ -1087,6 +1086,7 @@ enum cache_pending_result web_cache_async_pending(struct cache_handle* handle, u
 	ret=tango_cache_head_object(handle->clients[thread_id], ctx->f_tango_cache_fetch, &meta);
 	if(ret<0)
 	{
+		promise_dettach_ctx(p);
 		cache_pending_ctx_free_cb(ctx);
 		_mid->result=PENDING_RESULT_FOBIDDEN;
 		return _mid->result;