Developer builds authenticated backend proxy to serve storage files without frontend changes

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A software engineer migrated his website's static files from a local wwwroot folder to an external open-source storage service that required authentication even for GET requests. To avoid exposing authorization tokens to the browser or rewriting the frontend, he built a backend middleware that intercepts image and document requests and proxies them server-to-server using a securely stored token. The solution keeps URLs identical for end users while the backend fetches file bytes from the external storage and returns them with the correct content type. As a result, the project repository became significantly lighter, deployments faster, and the auth token never reaches the client side. Upload endpoints still write locally for now, with full decoupling from wwwroot planned as the next development phase.

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ProgrammingDEV Community ·

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