From d0621f7497c4c4a2f72a072e9f768a89a14adb00 Mon Sep 17 00:00:00 2001
From: MurakamiShinyu <murakami@vivliostyle.org>
Date: Tue, 29 Aug 2023 17:59:31 +0900
Subject: [PATCH] Experiment: EPUB encryption support test-2a

---
 packages/core/src/vivliostyle/net.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/packages/core/src/vivliostyle/net.ts b/packages/core/src/vivliostyle/net.ts
index de350cd28..e541b030d 100644
--- a/packages/core/src/vivliostyle/net.ts
+++ b/packages/core/src/vivliostyle/net.ts
@@ -69,7 +69,9 @@ export function ajax(
           opt_type,
           opt_method,
           opt_data,
-          opt_contentType,
+          opt_contentType ?? opt_type === XMLHttpRequestResponseType.DOCUMENT
+            ? "application/xml; charset=UTF-8"
+            : undefined,
         ).then((xhr2) => {
           xhr2.url = url;
           frame.finish(xhr2);
@@ -146,6 +148,9 @@ export function ajax(
         opt_contentType || "text/plain; charset=UTF-8",
       );
       request.send(opt_data);
+    } else if (opt_contentType) {
+      request.overrideMimeType(opt_contentType);
+      request.send(null);
     } else {
       if (
         /^file:|^https?:\/\/[^/]+\.githubusercontent\.com|\.(xhtml|xht|opf)$/i.test(