Issue
Although there is a valid manifest.json and <link rel="manifest" href="manifest.json"> in the head tag, chrome shows No Manifest Detected, service workers are installed successfully and http://127.0.0.1:8080/manifest.json is fine and accessible, but chrome not even requesting the manifest.json file! this is a flutter project which currently build for web using flutter build web --release
Solution
Finally I figured out the bug was introduced by flutter_native_splash which added some picture tag to the root of html page which caused the chrome not requesting the manifest.json, so moving the picture tag to body solved the issue.
https://pub.dev/packages/flutter_native_splash
Answered By – HoseinGhanbari
Answer Checked By – Mildred Charles (FlutterFixes Admin)