feat: add protocol.handle (#36674)

docs/breaking-changes.md

@@ -12,6 +12,55 @@ This document uses the following convention to categorize breaking changes:
 * **Deprecated:** An API was marked as deprecated. The API will continue to function, but will emit a deprecation warning, and will be removed in a future release.
 * **Removed:** An API or feature was removed, and is no longer supported by Electron.
 
+## Planned Breaking API Changes (25.0)
+
+### Deprecated: `protocol.{register,intercept}{Buffer,String,Stream,File,Http}Protocol`
+
+The `protocol.register*Protocol` and `protocol.intercept*Protocol` methods have
+been replaced with [`protocol.handle`](api/protocol.md#protocolhandlescheme-handler).
+
+The new method can either register a new protocol or intercept an existing
+protocol, and responses can be of any type.
+
+```js
+// Deprecated in Electron 25
+protocol.registerBufferProtocol('some-protocol', () => {
+  callback({ mimeType: 'text/html', data: Buffer.from('<h5>Response</h5>') })
+})
+
+// Replace with
+protocol.handle('some-protocol', () => {
+  return new Response(
+    Buffer.from('<h5>Response</h5>'), // Could also be a string or ReadableStream.
+    { headers: { 'content-type': 'text/html' } }
+  )
+})
+```
+
+```js
+// Deprecated in Electron 25
+protocol.registerHttpProtocol('some-protocol', () => {
+  callback({ url: 'https://electronjs.org' })
+})
+
+// Replace with
+protocol.handle('some-protocol', () => {
+  return net.fetch('https://electronjs.org')
+})
+```
+
+```js
+// Deprecated in Electron 25
+protocol.registerFileProtocol('some-protocol', () => {
+  callback({ filePath: '/path/to/my/file' })
+})
+
+// Replace with
+protocol.handle('some-protocol', () => {
+  return net.fetch('file:///path/to/my/file')
+})
+```
+
 ## Planned Breaking API Changes (24.0)
 
 ### API Changed: `nativeImage.createThumbnailFromPath(path, size)`