Merge pull request #36053 from nextcloud/backport/36043/stable25

[stable25] Link reference provider: Improve content-type check

Author: PVince81

lib/private/Collaboration/Reference/LinkReferenceProvider.php

@@ -116,7 +116,11 @@ private function fetchReference(Reference $reference): void {
 			return;
 		}
 		$linkContentType = $headResponse->getHeader('Content-Type');
-		if ($linkContentType !== 'text/html') {
+		$expectedContentType = 'text/html';
+		$suffixedExpectedContentType = $expectedContentType . ';';
+		$startsWithSuffixed = substr($linkContentType, 0, strlen($suffixedExpectedContentType)) === $suffixedExpectedContentType;
+		// check the header begins with the expected content type
+		if ($linkContentType !== $expectedContentType && !$startsWithSuffixed) {
 			$this->logger->debug('Skip resolving links pointing to content type that is not "text/html"');
 			return;
 		}