After implementing Google One Tap I noticed some JS errors on the client side (these client-side errors are caught in the browser and sent to the backend; I can see them in the backend logs but cannot reproduce the issue in the client side) for which the stack trace looks like this:
Error: A
at Object._.ad (/_/gsi/_/js/k=gsi.gsi.en_US.PmiGgqd91Pc.O/am=CQ/d=1/ct=zgms/rs=AF0KOtWwHiXCDsPbTZybnAb2zlX1YPJDGg/m=gis_client_library:109:138)
at /_/gsi/_/js/k=gsi.gsi.en_US.PmiGgqd91Pc.O/am=CQ/d=1/ct=zgms/rs=AF0KOtWwHiXCDsPbTZybnAb2zlX1YPJDGg/m=gis_client_library:299:24
at He.<anonymous> (/_/gsi/_/js/k=gsi.gsi.en_US.PmiGgqd91Pc.O/am=CQ/d=1/ct=zgms/rs=AF0KOtWwHiXCDsPbTZybnAb2zlX1YPJDGg/m=gis_client_library:241:164)
at uc (/_/gsi/_/js/k=gsi.gsi.en_US.PmiGgqd91Pc.O/am=CQ/d=1/ct=zgms/rs=AF0KOtWwHiXCDsPbTZybnAb2zlX1YPJDGg/m=gis_client_library:87:200)
at He._.l.dispatchEvent (/_/gsi/_/js/k=gsi.gsi.en_US.PmiGgqd91Pc.O/am=CQ/d=1/ct=zgms/rs=AF0KOtWwHiXCDsPbTZybnAb2zlX1YPJDGg/m=gis_client_library:85:347)
at Be (/_/gsi/_/js/k=gsi.gsi.en_US.PmiGgqd91Pc.O/am=CQ/d=1/ct=zgms/rs=AF0KOtWwHiXCDsPbTZybnAb2zlX1YPJDGg/m=gis_client_library:179:210)
at Fe (/_/gsi/_/js/k=gsi.gsi.en_US.PmiGgqd91Pc.O/am=CQ/d=1/ct=zgms/rs=AF0KOtWwHiXCDsPbTZybnAb2zlX1YPJDGg/m=gis_client_library:181:245)
at He._.l.zc (/_/gsi/_/js/k=gsi.gsi.en_US.PmiGgqd91Pc.O/am=CQ/d=1/ct=zgms/rs=AF0KOtWwHiXCDsPbTZybnAb2zlX1YPJDGg/m=gis_client_library:186:212)
at He._.l.Nb (/_/gsi/_/js/k=gsi.gsi.en_US.PmiGgqd91Pc.O/am=CQ/d=1/ct=zgms/rs=AF0KOtWwHiXCDsPbTZybnAb2zlX1YPJDGg/m=gis_client_library:186:187)
The JS code that throws this error is embedded in a <script> tag inside an <iframe> that displays the One Tap login popup and it seems to expect an AJAX response with a specific prefix; the statement that throws the error basically looks like this (minified JS):
if (!a.startsWith(")]}'\n")) throw console.error("malformed JSON response:", a), Error("A");
I checked the network requests and noticed that there is an XHR request that returns the response in this format; the endpoint is https://accounts.google.com/gsi/status (with some extra request parameters) but I cannot find any documentation from google for this endpoint.
Does anyone know would could be the cause of this error?
Thank you