fix xhtml pages' content-disposition (#2903)

Co-authored-by: Yuki Okushi <jtitor@2k36.org>

actix-files/CHANGES.md

@@ -1,8 +1,10 @@
 # Changes
 
 ## Unreleased - 2022-xx-xx
+- XHTML files now use `Content-Disposition: inline` instead of `attachment`. [#2903]
 - Minimum supported Rust version (MSRV) is now 1.59 due to transitive `time` dependency.
 
+[#2903]: https://github.com/actix/actix-web/pull/2903
 
 ## 0.6.2 - 2022-07-23
 - Allow partial range responses for video content to start streaming sooner. [#2817]

actix-files/src/named.rs

@@ -132,7 +132,7 @@ impl NamedFile {
                 mime::IMAGE | mime::TEXT | mime::AUDIO | mime::VIDEO => DispositionType::Inline,
                 mime::APPLICATION => match ct.subtype() {
                     mime::JAVASCRIPT | mime::JSON => DispositionType::Inline,
-                    name if name == "wasm" => DispositionType::Inline,
+                    name if name == "wasm" || name == "xhtml" => DispositionType::Inline,
                     _ => DispositionType::Attachment,
                 },
                 _ => DispositionType::Attachment,