Issue with CORS when response is cached about itty-router

[kwhitley]

Love the detailed writeup! Super helpful - should be fixed in 5.0.17 :)

[chris-laplante]

If anyone is still having issues with this in 5.0.17, I found that I had to bypass corsify for redirect responses. I'm not quite sure why, but it works now. Here is my code:

const { preflight, corsify } = cors();

type CFArgs = [Env, ExecutionContext];

// Do not corsify for redirections
const wrappedCorsify = (response: Response, request?: Request): Response => {
    if (response?.status === 302) {
        return response;
    }

    return corsify(response, request);
};

const router = AutoRouter<IRequest, CFArgs>({
    before: [preflight],
    finally: [wrappedCorsify]
});

router
    .get('/authorize', (request, env) => {
            return Response.redirect(
                `https://github.com/login/oauth/authorize?client_id=${env.GITHUB_OAUTH_APP_CLIENT_ID}&scope=gist`,
                302
            );
        }
    );