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packages/plugin-ext/README.md

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+<br />
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+<img src='https://raw.githubusercontent.com/eclipse-theia/theia/master/logo/theia.svg?sanitize=true' alt='theia-ext-logo' width='100px' />
+
+<h2>ECLIPSE THEIA - PLUGIN-EXT EXTENSION</h2>
+
+<hr />
+
+</div>
+
+## Description
+
+The `@theia/plugin-ext` extension contributes functionality for the `plugin` API.
+
+## Implementation
+
+The implementation is inspired from: <https://blog.mattbierner.com/vscode-webview-web-learnings/>.
+
+## Environment Variables
+
+- `THEIA_WEBVIEW_EXTERNAL_ENDPOINT`
+
+  A string pattern possibly containing `{{uuid}}` and `{{hostname}}` which will be replaced. This is the host for which the `webviews` will be served on.
+  It is a good practice to host the `webview` handlers on a sub-domain as it is more secure.
+  Defaults to `{{uuid}}.webview.{{hostname}}`.
+
+## Security Warnings
+
+- Potentially Insecure Host Pattern
+
+  When you change the host pattern via the `THEIA_WEBVIEW_EXTERNAL_ENDPOINT` environment variable warning will be emitted both from the frontend and from the backend.
+  You can disable those warnings by setting `warnOnPotentiallyInsecureHostPattern: false` in the appropriate application configurations in your application's `package.json`.
+
+## Naming in this package
+
+This package has a different folder structure than other Theia packages. Stuff in the "hosted" folder is meant to be scoped to a front end,
+whereas "main" is global to a back end instance. Code in "plugin" runs inside the plugin host process. But be aware that this is not always the case,
+for example the plugin manifest scanners (e.g. `scanner-theia.ts`) are in the `hosted` folder, even though they a global concern.
+
+## Additional Information
+
+- [API documentation for `@theia/plugin-ext`](https://eclipse-theia.github.io/theia/docs/next/modules/_theia_plugin-ext.html)
+- [Theia - GitHub](https://github.com/eclipse-theia/theia)
+- [Theia - Website](https://theia-ide.org/)
+
+## License
+
+- [Eclipse Public License 2.0](http://www.eclipse.org/legal/epl-2.0/)
+- [一 (Secondary) GNU General Public License, version 2 with the GNU Classpath Exception](https://projects.eclipse.org/license/secondary-gpl-2.0-cp)
+
+## Trademark
+
+"Theia" is a trademark of the Eclipse Foundation
+<https://www.eclipse.org/theia>