fix(core): use Headers in sendIpcMessage (#13227)

* Use `Headers` in `sendIpcMessage`

* Add change file

* Change files

* Don't use optional chaining
Seems like we have changed it in #9530 deliberately,
so preserving it in this change

* do not let the tauri headers to be overwritten

Co-authored-by: Sean Wang <126865849+WSH032@users.noreply.github.com>

* use HeadersInit on the type definition

---------

Co-authored-by: Lucas Nogueira <lucas@tauri.app>
Co-authored-by: Sean Wang <126865849+WSH032@users.noreply.github.com>

Author: 3 people

.changes/invoke-headers-non-ascii.md

@@ -0,0 +1,5 @@
+---
+"tauri": patch:bug
+---
+
+`invoke` will now properly throw when `options.headers` contains non-ascii characters instead of silently replacing them

.changes/invoke-headers.md

@@ -0,0 +1,5 @@
+---
+"tauri": patch:bug
+---
+
+Fix `invoke` ignores the headers option if it's an `Headers`

crates/tauri/scripts/ipc-protocol.js

@@ -27,16 +27,17 @@
       && (canUseCustomProtocol || cmd === fetchChannelDataCommand)
     ) {
       const { contentType, data } = processIpcMessage(payload)
+
+      const headers = new Headers((options && options.headers) || {})
+      headers.set('Content-Type', contentType)
+      headers.set('Tauri-Callback', callback)
+      headers.set('Tauri-Error', error)
+      headers.set('Tauri-Invoke-Key', __TAURI_INVOKE_KEY__)
+
       fetch(window.__TAURI_INTERNALS__.convertFileSrc(cmd, 'ipc'), {
         method: 'POST',
         body: data,
-        headers: {
-          'Content-Type': contentType,
-          'Tauri-Callback': callback,
-          'Tauri-Error': error,
-          'Tauri-Invoke-Key': __TAURI_INVOKE_KEY__,
-          ...((options && options.headers) || {})
-        }
+        headers
       })
         .then((response) => {
           const cb =

packages/api/src/core.ts

@@ -220,7 +220,7 @@ type InvokeArgs = Record<string, unknown> | number[] | ArrayBuffer | Uint8Array
  * @since 2.0.0
  */
 interface InvokeOptions {
-  headers: Headers | Record<string, string>
+  headers: HeadersInit
 }
 
 /**