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Understanding Flutter Web Renderers: HTML vs. CanvasKit and How to Fix CORS Issues in Flutter 3.27.0+
Understanding Flutter Web Renderers: HTML vs. CanvasKit and How to Fix CORS Issues in Flutter 3.27.0+
Flutter 3.27.0 brought exciting improvements to Flutter Web, but with those improvements, many developers are encountering a frustrating CORS (Cross-Origin Resource Sharing) issue when loading external images. This blog post will explain the transition from HTML renderer to CanvasKit in Flutter 3.27.0, and how it affects the way images are loaded in web applications. We’ll also discuss the causes of the “Failed to execute ‘texImage2D’ on ‘WebGL2RenderingContext’” error and provide a solution to fix it.
What is Web Renderer in Flutter?
In Flutter, the Web Renderer is responsible for rendering your Flutter application to the browser. It determines how your app’s UI is displayed, including images, animations, text, and other graphics. Flutter offers two types of web renderers:
- HTML Renderer (Previously Default)
- CanvasKit Renderer (New Default in Flutter 3.27.0+)
