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• Summary: The Apps Script application is not working as expected. The first page works, but the second page does not. It is difficult to determine the root cause without additional information.
• Tags:
  • apps-script
  • script-execution
  • api-integration
  • error-handling

Additional resources:

• https://developers.google.com/apps-script/guides/support/troubleshooting
• https://developers.google.com/apps-script/support
• https://stackoverflow.com/.../how-to-debug-or-view-logs-in-google-app-scr...
• https://stackoverflow.com/.../appscript-webapp-hyperlink-not-working-the-...
• https://stackoverflow.com/.../serve-separate-html-pages-google-apps-script-...

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Facing the same issue with my web app. Customers open a link leading to the web app via iOS instagram browser and are unable to proceed due to due undefined being shown. Possible workaround is to open the page in an external browser, but that is a non-obvious solution for the user.

Can you share the output of the Apps Script Web HTTP request, specifically the headers and the body of the response after redacting any personal information? Does it return the same response if you spoof the agent in the HTTP call to match the instagram browser?

Device: iPhone 13 Pro iOS Version 17.1.2

My setup: The Google Web App is embedded as iFrame in the website. Tried spoofing user agent to the Safari Browser agent if the Instagram Browser agent is detected, but results remains the same.

Logs for Instagram Browser in iOS (Web App returns "undefined")

2|app  | Request Headers: {
2|app  |   connection: 'upgrade',
2|app  |   host: 'myRedactedWebsite.com',
2|app  |   'sec-fetch-site': 'cross-site',
2|app  |   'accept-encoding': 'gzip, deflate, br',
2|app  |   'if-none-match': 'W/"40d-Yo4aoXJWxlKJb0RDqgp4bxquM9w"',
2|app  |   'sec-fetch-mode': 'navigate',
2|app  |   accept: 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
2|app  |   'user-agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 17_1_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Mobile/15E148',
2|app  |   referer: 'https://l.instagram.com/',
2|app  |   'sec-fetch-dest': 'document',
2|app  |   'accept-language': 'en-GB,en;q=0.9'
2|app  | }
2|app  | Request Body: undefined

Logs for Safari Browser on iOS (Web App serves content)

2|app  | Request Headers: {
2|app  |   connection: 'upgrade',
2|app  |   host: 'myRedactedWebsite.com',
2|app  |   'sec-fetch-site': 'none',
2|app  |   'upgrade-insecure-requests': '1',
2|app  |   'sec-fetch-mode': 'navigate',
2|app  |   accept: 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
2|app  |   'user-agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 17_1_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1.2 Mobile/15E148 Safari/604.1',
2|app  |   'accept-language': 'en-GB,en;q=0.9',
2|app  |   'sec-fetch-dest': 'document',
2|app  |   'accept-encoding': 'gzip, deflate'
2|app  | }
2|app  | Request Body: undefined