diff --git a/net/http/client.cpp b/net/http/client.cpp
index efb6b3b0..de5f6a88 100644
--- a/net/http/client.cpp
+++ b/net/http/client.cpp
@@ -29,7 +29,7 @@ namespace photon {
 namespace net {
 namespace http {
 static const uint64_t kDNSCacheLife = 3600UL * 1000 * 1000;
-static constexpr char USERAGENT[] = "EASE/0.21.6";
+static constexpr char USERAGENT[] = "PhotonLibOS_HTTP";
 
 
 class PooledDialer {
diff --git a/photon.cpp b/photon.cpp
index a17cfe72..cafc770c 100644
--- a/photon.cpp
+++ b/photon.cpp
@@ -38,7 +38,7 @@ static thread_local uint64_t g_event_engine = 0, g_io_engine = 0;
 
 // Try to init master engine with the recommended order
 #if defined(__linux__)
-static const int recommended_order[] = {INIT_EVENT_IOURING, INIT_EVENT_EPOLL, INIT_EVENT_SELECT};
+static const int recommended_order[] = {INIT_EVENT_EPOLL, INIT_EVENT_IOURING, INIT_EVENT_SELECT};
 #else   // macOS, FreeBSD ...
 static const int recommended_order[] = {INIT_EVENT_KQUEUE, INIT_EVENT_SELECT};
 #endif