Google OAuth's strict redirect URI matching: A guide for multi-tenant apps
Blog post from WorkOS
Managing OAuth 2.0 redirect URIs with Google can be particularly challenging for multi-tenant applications due to its strict exact-match requirements, which differ from more flexible approaches by other providers like Microsoft Entra ID and Okta. Google's policy necessitates the precise registration of each redirect URI, contrasting with Microsoft's allowance for wildcard subdomain URIs and Okta's programmatic configuration capabilities. This strictness presents operational hurdles, particularly during domain migrations or when managing numerous customer-specific domains, as failure to update URIs promptly can lead to redirect_uri_mismatch errors. Solutions such as using a central proxy pattern or provisioning separate OAuth clients per customer can alleviate some of these issues, although they introduce additional complexities. The importance of carefully planning migrations and treating redirect URI management as a key infrastructure concern is emphasized, as Google's stringent security model aims to prevent potential attacks via wildcard redirects, placing the onus on developers to ensure seamless integration and customer experience.
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