From 9da0ebc85c2c64735acb728fda1e04f30b63c229 Mon Sep 17 00:00:00 2001
From: Christian Schneider
Date: Tue, 28 Jul 2026 17:04:20 +0200
Subject: Add option 'unconditional' to suppress If-Modified-Since header when
 refetching

---
 it_url.class | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'it_url.class')

diff --git a/it_url.class b/it_url.class
index fbb4101..6916661 100644
--- a/it_url.class
+++ b/it_url.class
@@ -201,7 +201,7 @@ static function _default_headers($url, $p)
 		'X-Ultra-Https' => $_SERVER['HTTPS'],
 	]);
 
-	if (is_int($p['filemtime']))
+	if (!$p['unconditional'] && is_int($p['filemtime']))
 		$headers['If-Modified-Since'] = gmdate("D, d M Y H:i:s T", $p['filemtime']);	# Use GMT as per https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/If-Modified-Since
 	return $headers;
 }
@@ -602,6 +602,7 @@ static function get_cache_filename($p)
  * @param $p['safety']      DEPRECATED. see $p['it_error']
  * @param $p['it_error']    parameters for it::error(), false means ignore errors, anything else gets passed to it::error() if errors occur
  * @param $p['keepfailed']  keep old versions of files if download fails
+ * @param $p['unconditional'] Make request unconditional, i.e. do not send If-Modified-Since header when refetching (Work-around for Windy webcam caching problem)
  * @param $p['returnheaders'] Return array($path, $headers) instead of simply $path
  * @param $p['postprocess'] UNSUPPORTED, use ::get_cache_contents
  * @param $p['lock']        prevent multiple requests to same url from different processes [true]
-- 
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