Disclosure: This draft was generated with AI and checked against the cited primary sources, with a separate AI editorial review. It was prepared for the FrameSprite team, which has a commercial interest in FrameSprite. Proposed examples are not executed tests unless explicitly identified as recorded fixture results.
When Bevy art loads locally but returns 404 from a web build, inspect the actual requested URL and the deployed asset directory before changing the PNG. AssetPlugin configures the asset source path; the browser and hosting route still determine where requests resolve. This guide uses the Bevy 0.17.2 AssetPlugin source.
Key Takeaways
- Capture a failed network URL before editing an asset path.
- Ship the matching asset directory alongside the web application.
- Distinguish a real image response from an HTML fallback returned with status 200.
Compare the requested path with the deployed file
Suppose the application is served at /demo/ and the intended image is /demo/assets/characters/hero.png. A request to /assets/characters/hero.png points somewhere different. The right correction depends on the deployed base, your asset source configuration and how the application was packaged.
Open the browser network panel, reload without relying on a previous successful cache, and record the exact request URL. Inspect the response content type and first bytes. A single-page application fallback may return HTML even though the URL ends in .png.
Compare filename case as well. A path that works on a case-insensitive development filesystem may not match a case-sensitive host. Keep spaces and special characters out of new asset identifiers where practical, while preserving old references deliberately.
Configure one asset root
Bevy's default unprocessed asset directory is assets. A fragment for a deliberate alternate directory is:
// Bevy 0.17.2 fragment; not executed here.
app.add_plugins(DefaultPlugins.set(AssetPlugin {
file_path: "game_assets".into(),
..default()
}));
// Load relative to that asset source:
// asset_server.load("characters/hero.png");
Do not automatically prepend the source directory again inside every load request. Inspect the official asset-loading example for relative asset names and the handle-based loading pattern.
A directory string is not a universal subdirectory-hosting fix. Confirm the resulting browser request in the actual packaged build. If the host rewrites URLs, changes a base path or serves processed assets, record that deployment behavior alongside the build configuration.
Check the reader used by the target
Native files and web requests do not provide identical environments. The asset source chooses a reader for the platform. For Bevy 0.17.2, compare the official browser asset-reader implementation with your deployment assumptions.
| Observation | Investigate next |
|---|---|
| 404 with intended directory absent | Packaging or upload list |
| 404 with wrong prefix | Configured source and hosting base |
| 200 containing HTML | Host fallback or rewrite |
| Image response but load fails | Decoder support and logged load error |
Keep the original asset while investigating. Re-exporting a sprite cannot fix a URL that points to an HTML page. The Bevy dependency-readiness guide handles failures after the request reaches the asset system.
Acceptance from the hosted build
Load the application directly at its public subdirectory, then refresh that URL. Confirm the character and one additional asset load without a warm cache. Test an intentionally missing filename and verify the error remains visible in logs.
Record the public application base, source directory and asset-relative names in the animation handoff checklist. Before deployment, use the sprite preparation workflow to keep file and frame naming consistent.
No hosted Bevy application was deployed or run for this guide. The example paths are hypothetical; acceptance requires checking the actual network request and response in your build.
Verify the uploaded package as one unit
Compare the asset manifest used by the build with the files actually uploaded. A correct URL configuration still fails when a deployment copies the application binary and omits its asset tree. Keep filenames, case and directory structure together during packaging. If the host serves an older cached application with newer assets, the requests can also disagree with the intended release. Diagnose that mismatch with explicit release and file records rather than changing load paths repeatedly. The browser response is the final evidence for the hosted build.
Sources and editorial ownership
Primary references checked on October 20, 2026:
Editorial owner: FrameSprite Workflow Team. Editorial and verification policy. Report a documentation correction.
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