The manifest for a Progressive Web App (PWA) should include a start_url,
which indicates the URL to be loaded when the user launches the app.
If the browser doesn't receive an
HTTP 200 response
when accessing an app from the start_url,
either the start_url isn't correct, or the page isn't accessible offline.
This causes problems for users who have installed the app to their devices.
How the Lighthouse start_url audit fails
Lighthouse
flags web apps whose start URL doesn't respond with a 200 when offline:
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-04-16 UTC."],[],[]]