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Nginx proxy to signed S3 URLs

  • Backend app sets X-Accel-Redirect header to a location that nginx is configured to handle (e.g. /s3-proxy/)

  • Backend app generates signed URL and stores it in HTTP header

  • Backend app stores s3 host in separate HTTP header

  • nginx location (e.g. /s3-proxy/) extracts content from HTTP headers and proxies requests to S3

  • Alternatives that didn't work

    • escaping s3 presigned url in X-Accel-Redirect
    • adding querystring to X-Accel-Redirect URI
    • TODO: Continue this list
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