• Nodejs (check the komga-webui/.nvmrc file)

You can run a live development server with npm run serve. The dev server will override the URL to connect to localhost:8080, so you can also run gradle bootRun to have a backend running, serving the API requests. The frontend will be loaded from localhost:8081.

Make sure you start the backend with the dev profile, else the frontend requests will be denied because of CORS.

The generated bundle is server by Apache Tomcat when running Spring. By default the site is hosted at /, but if server.servlet-context-path is set, the base URL can be dynamic.

The base URL needs to be set correctly so the web app works:

• in the API client
• in the Vue Router, to properly handle the web history
• in the generated bundle, to load other files (js/css/images)

1. Webpack is configured with __webpack_public_path__ to change the path dynamically.

2. To handle the dynamic path in index.html, a Gradle task webuiCopyIndex modifies index.html to duplicate href, src and content attributes as Thymeleaf variants.

   For example the following:

   <script
       type="module"
       crossorigin
       src="/assets/index-xEUJQodq.js"
   ></script>
   <link
       rel="stylesheet"
       crossorigin
       href="/assets/index-CQqFNa2f.css"
   />

   will be transformed to:

   <script
       type="module"
       crossorigin
       src="/assets/index-xEUJQodq.js"
       th:src="@{/assets/index-xEUJQodq.js}"
   ></script>
   <link
       rel="stylesheet"
       crossorigin
       href="/assets/index-CQqFNa2f.css"
       th:href="@{/assets/index-CQqFNa2f.css}"
   />

   In Thymeleaf, @{} will prepend the path with the context path dynamically when serving index.html.

3. when the index.html is served by the IndexController, a baseUrl attribute is injected, which contains the servlet context path (by default /, but could be /komga for example)

4. the index.html contains a Thymeleaf script block that will be processed when serving the page, effectively injecting the baseUrl value into window.ressourceBaseUrl.

5. window.ressourceBaseUrl is subsequently used in Typescript code to set the base URL