I am building a Flutter mobile application and trying to cast a local .mp4 file to Chromecast.

✅ Current Architecture

• Flutter mobile app

• I start a local HTTP server on the mobile device (same WiFi network)

• Example served URL:

http://192.168.1.23:8080/video.mp4

• I pass this URL as contentId in the Google Cast LOAD request.

🔧 Media Load Request (Simplified)

await chromeCastSession.loadMedia(
GoogleCastMediaInformationIOS(
    contentId: contentUrl,
    contentUrl: Uri.parse(contentUrl),
    contentType: contentType,
    streamType: CastMediaStreamType.buffered,
    duration: videoDuration,
    metadata: metadata,
   )
);

🚫 Problem

The Chromecast receiver rejects the load/play request.

Symptoms:

• Media status becomes IDLE

• Player state does not change to BUFFERING or PLAYING

• No playback starts

• Receiver logs indicate load failure (no detailed error exposed in Flutter)

📌 Important Notes

• The Chromecast and mobile device are on the same WiFi network

• The URL works in:

  • Mobile browser

  • Laptop browser (same network)

• The .mp4 file plays correctly locally

• The server is a basic Dart HTTP server (dart:io)

❓ Questions

1. Does Chromecast require specific HTTP headers (e.g., Range support)?

2. Does the server need to support:

   • Partial content (206 responses)?

   • Byte range requests?

3. Are there known limitations when casting from a mobile-hosted HTTP server?

4. Could this be related to:

   • CORS?

   • MIME type?

   • Missing Accept-Ranges header?

   • HTTPS requirement?

🎯 What I Want to Understand

What are the exact server requirements for Chromecast to successfully load and play media from a local HTTP server?
How can I chrome cast .mp4 videos form mobile?