And replace the 'ctx.WriteWithExpiration' with simple 'ctx.Write' at 'StaticEmbeddedHandler' of core/router/fs.go, now that we have plenty of options for client cache give the end-dev the oportunity to use them or not on static embedded handlers
Former-commit-id: 9c9e2f3de3c5ad8c9e14e453b67e6b649b02bde8