From 982c7eda4fc775b66cab403df7dab8bd3ff29575 Mon Sep 17 00:00:00 2001
From: tobi <tobi.smethurst@protonmail.com>
Date: Mon, 24 Feb 2025 10:37:45 +0100
Subject: [PATCH] check incoming if-none-match header

---
 internal/api/robots/robots.go | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/internal/api/robots/robots.go b/internal/api/robots/robots.go
index d7af8b22b..b72a01ed6 100644
--- a/internal/api/robots/robots.go
+++ b/internal/api/robots/robots.go
@@ -51,11 +51,27 @@ func (m *Module) Route(attachHandler func(method string, path string, f ...gin.H
 func (m *Module) robotsGETHandler(c *gin.Context) {
 	const ETag = "\"" + apiutil.RobotsTxtETag + "\""
 	c.Header("ETag", ETag)
+
+	if c.Request.Header.Get("If-None-Match") == ETag {
+		// Cached.
+		c.AbortWithStatus(http.StatusNotModified)
+		return
+	}
+
+	// Not cached, serve.
 	c.String(http.StatusOK, apiutil.RobotsTxt)
 }
 
 func (m *Module) robotsGETHandlerDisallowNodeInfo(c *gin.Context) {
 	const ETag = "\"" + apiutil.RobotsTxtDisallowNodeInfoETag + "\""
 	c.Header("ETag", ETag)
+
+	if c.Request.Header.Get("If-None-Match") == ETag {
+		// Cached.
+		c.AbortWithStatus(http.StatusNotModified)
+		return
+	}
+
+	// Not cached, serve.
 	c.String(http.StatusOK, apiutil.RobotsTxtDisallowNodeInfo)
 }