diff --git a/src/helpers/constants/http_status_codes.php b/src/helpers/constants/http_status_codes.php
index 6b2e637..e270394 100644
--- a/src/helpers/constants/http_status_codes.php
+++ b/src/helpers/constants/http_status_codes.php
@@ -24,6 +24,7 @@ $httpCodes = [
     204 => 'HTTP_NO_CONTENT',
     205 => 'HTTP_RESET_CONTENT',
     206 => 'HTTP_PARTIAL_CONTENT',
+    218 => 'HTTP_THIS_IS_FINE', // Apache specific
 
     // 300's (redirections / "go away")
     300 => 'HTTP_MULTIPLE_CHOICE',
@@ -57,12 +58,14 @@ $httpCodes = [
     236 => 'HTTP_UPGRADE_REQUIRED',
     428 => 'HTTP_PRECONDITION_REQUIRED',
     429 => 'HTTP_TOO_MANY_REQUESTS',
+    444 => 'HTTP_NO_RESPONSE', // Nginx specific, used internally to return no info and close connection immediately
     451 => 'HTTP_GAG_ORDER',
 
     // 500's (server-level problem, process died or configuration is incorrect / "server screwed up")
     500 => 'HTTP_SERVER_ERROR',
     501 => 'HTTP_NOT_IMPLEMENTED',
     503 => 'HTTP_UNAVAILABLE',
+    529 => 'HTTP_SITE_OVERLOADED', // Qualys specific, API response to indicate server resources are over capacity
     530 => 'HTTP_SUSPENDED',
 ];