Check status and pass headers when proxy-streaming from file-store #17
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Before this change, when there was any issue during proxy,
fileRes.pipe
might have proxied 0 bytes, or proxy error body from store with status 200.Such issues might be temporary, for example due to eventual consistency on S3 upload, but because the response status is 200 and caching headers are set for a year, this can cause invalid response to be cached forever when using cdn-cache.