Automatically sets the ETag header on all String bodies.
The ETag header is skipped if ETag or Last-Modified headers are sent or if a sendfile body (body.responds_to :to_path) is given (since such cases should be handled by apache/nginx).
On initialization, you can pass two parameters: a Cache-Control directive used when Etag is absent and a directive when it is present. The first defaults to nil, while the second defaults to “max-age=0, private, must-revalidate”
# File lib/rack/etag.rb, line 22 def call(env) status, headers, body = @app.call(env) if etag_status?(status) && etag_body?(body) && !skip_caching?(headers) digest, body = digest_body(body) headers['ETag'] = %("#{digest}") if digest end unless headers['Cache-Control'] headers['Cache-Control'] = (digest ? @cache_control : @no_cache_control) || [] end [status, headers, body] end
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