diff --git a/service/http_client.go b/service/http_client.go
index be89c73c0..3ae6a6761 100644
--- a/service/http_client.go
+++ b/service/http_client.go
@@ -38,6 +38,7 @@ func InitHttpClient() {
 		MaxIdleConns:        common.RelayMaxIdleConns,
 		MaxIdleConnsPerHost: common.RelayMaxIdleConnsPerHost,
 		ForceAttemptHTTP2:   true,
+		Proxy:               http.ProxyFromEnvironment, // Support HTTP_PROXY, HTTPS_PROXY, NO_PROXY env vars
 	}
 
 	if common.RelayTimeout == 0 {