From 11c65f46215fee9a436a0e25b2f968a883240771 Mon Sep 17 00:00:00 2001
From: Clown <3148835359@qq.com>
Date: Tue, 12 Nov 2024 19:27:21 +0800
Subject: [PATCH] fix GitHub notification interface return "Unable to parse
 If-Modified-Since request header"

---
 src/main/java/org/kohsuke/github/GHNotificationStream.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/java/org/kohsuke/github/GHNotificationStream.java b/src/main/java/org/kohsuke/github/GHNotificationStream.java
index 7e62d7b6c6..f769907125 100644
--- a/src/main/java/org/kohsuke/github/GHNotificationStream.java
+++ b/src/main/java/org/kohsuke/github/GHNotificationStream.java
@@ -187,7 +187,9 @@ GHThread fetch() {
                             Thread.sleep(waitTime);
                         }
 
-                        req.setHeader("If-Modified-Since", lastModified);
+                        if (lastModified != null) {
+                            req.setHeader("If-Modified-Since", lastModified);
+                        }
 
                         Requester requester = req.withUrlPath(apiUrl);
                         GitHubResponse<GHThread[]> response = ((GitHubPageContentsIterable<GHThread>) requester