Runtime environment variable for rewrite

[autumn hearth]

Hi,

I have a rewrite configuration in next.config.ts in order to proxy some API requests:

const nextConfig = {
    output: "standalone",
    async rewrites() {
        const base = process.env.EGD_API_BASE_URL;
        if (!base) {
            console.warn(
                "EGD_API_BASE_URL is not set at build time; no /api rewrite will be emitted.",
            );
            return [];
        }
        return [
            {
                source: "/api/:path*",
                destination: `${base}/:path*`,
            },
        ];
    },
};
export default nextConfig;

I think that what is happening is that it's not picking up the environment variable at runtime (this is built into a Docker container for production).

Am I thinking along the right lines? And if so, is there a way to have the environment variable picked up at runtime?

[orchid marsh]

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[autumn hearth]

ChatGPT seems to believe that I'm thinking along the right lines about the cause of this problem - that the environment variable is baked in at build time and hence my issue.

Since this is getting deployed into a Kubernetes cluster, I'm now looking at proxying from within the ingress resource, rather than having the application handle it.

Still open to any advice on this...