Resolve OAuth redirect URI mismatches for portless local development.
npx skills add https://github.com/andreasasprou/polaris --skill oauth-andreasasprou
Please help me install this Agent Skill. Skill: oauth Source: https://github.com/andreasasprou/polaris/tree/main/.agents/skills/oauth Command: npx skills add https://github.com/andreasasprou/polaris --skill oauth-andreasasprou
Local OAuth flows often fail because providers reject .localhost subdomains or require publicly valid redirect URIs, causing errors like redirect_uri_mismatch or invalid redirect; this Skill explains how to use portless with a real TLD and correct environment/provider settings so callbacks succeed during local development.
Start a portless proxy with a valid public TLD and update your application's callback URLs and NEXTAUTH_URL to match the resulting https://myapp.dev so the registered provider redirect URIs align.
High-intent search queries and answers about installing and using this skill.
OAuth redirect_uri_mismatch happens because providers reject .localhost subdomains lacking a valid public-suffix TLD. You must use a local proxy like portless with a real TLD and HTTPS so your redirect URIs align with registered provider entries.
To configure Google and Apple OAuth redirect URIs, update your provider console entries to match a portless proxy URL like https://myapp.dev. Apple specifically requires public domain resolution, so ensure your local environment serves the callback over a valid public-suffix TLD.
Yes, NextAuth works with portless by updating your NEXTAUTH_URL environment variable to match your portless https://myapp.dev proxy address. This ensures your sign-in flows resolve correctly without provider rejections during local testing.
Fixing OAuth redirect errors requires updating environment variables like NEXTAUTH_URL, PORTLESS_URL, and callbackURL to match your portless proxy address. These variables ensure your application generates redirect URLs that align with your registered provider entries.
Yes, you need HTTPS for local OAuth callbacks when using a custom TLD because HSTS-enforced domains require secure connections. Running a trusted local proxy like portless with HTTPS ensures providers accept your redirect URIs without rejection.
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