fix(@astrojs/rss): use standard rss content type, add utf-8 charset (#12644)

* fix(@astrojs/rss): use standard rss content type, add utf-8 charset

* Update .changeset/loud-cobras-rhyme.md

---------

Co-authored-by: Matt Kane <m@mk.gg>

Author: kunyan

.changeset/loud-cobras-rhyme.md

@@ -0,0 +1,5 @@
+---
+'@astrojs/rss': patch
+---
+
+Sends the standard RSS content type response header, with UTF-8 charset

packages/astro-rss/src/index.ts

@@ -89,7 +89,7 @@ export default async function getRssResponse(rssOptions: RSSOptions): Promise<Re
 	const rssString = await getRssString(rssOptions);
 	return new Response(rssString, {
 		headers: {
-			'Content-Type': 'application/xml',
+			'Content-Type': 'application/rss+xml; charset=utf-8',
 		},
 	});
 }

packages/astro-rss/test/rss.test.js

@@ -62,7 +62,7 @@ describe('rss', () => {
 		assertXmlDeepEqual(str, validXmlResult);
 
 		const contentType = response.headers.get('Content-Type');
-		assert.equal(contentType, 'application/xml');
+		assert.equal(contentType, 'application/rss+xml; charset=utf-8');
 	});
 
 	it('should be the same string as getRssString', async () => {