electron/docs/fiddles/system/protocol-handler/launch-app-from-URL-in-anot.../index.html

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<title>app.setAsDefaultProtocol Demo</title>
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<h1>App Default Protocol Demo</h1>
<p>The protocol API allows us to register a custom protocol and intercept existing protocol requests.</p>
<p>These methods allow you to set and unset the protocols your app should be the default app for. Similar to when a
browser asks to be your default for viewing web pages.</p>
<p>Open the <a href="https://www.electronjs.org/docs/latest/api/protocol">full protocol API documentation</a> in your
browser.</p>
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<h3>Demo</h3>
<p>
First: Launch current page in browser
<button id="open-in-browser" class="js-container-target demo-toggle-button">
Click to Launch Browser
</button>
</p>
<p>
Then: Launch the app from a web link!
<a href="electron-fiddle://open">Click here to launch the app</a>
</p>
----
<p>You can set your app as the default app to open for a specific protocol. For instance, in this demo we set this app
as the default for <code>electron-fiddle://</code>. The demo button above will launch a page in your default
browser with a link. Click that link and it will re-launch this app.</p>
<h3>Packaging</h3>
<p>This feature will only work on macOS when your app is packaged. It will not work when you're launching it in
development from the command-line. When you package your app you'll need to make sure the macOS <code>plist</code>
for the app is updated to include the new protocol handler. If you're using <code>@electron/packager</code> then you
can add the flag <code>--extend-info</code> with a path to the <code>plist</code> you've created. The one for this
app is below:</p>
<p>
<h5>macOS plist</h5>
<pre><code>
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"&gt;
&lt;plist version="1.0"&gt;
&lt;dict&gt;
&lt;key&gt;CFBundleURLTypes&lt;/key&gt;
&lt;array&gt;
&lt;dict&gt;
&lt;key&gt;CFBundleURLSchemes&lt;/key&gt;
&lt;array&gt;
&lt;string&gt;electron-api-demos&lt;/string&gt;
&lt;/array&gt;
&lt;key&gt;CFBundleURLName&lt;/key&gt;
&lt;string&gt;Electron API Demos Protocol&lt;/string&gt;
&lt;/dict&gt;
&lt;/array&gt;
&lt;key&gt;ElectronTeamID&lt;/key&gt;
&lt;string&gt;VEKTX9H2N7&lt;/string&gt;
&lt;/dict&gt;
&lt;/plist&gt;
</code>
</pre>
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