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, privaute, must-revalidate"
# File lib/sinatra/rack_etag.rb, line 34 def initialize(app, no_cache_control = nil, cache_control = nil) @app = app @cache_control = cache_control || "max-age=0, private, must-revalidate" @no_cache_control = no_cache_control end
# File lib/sinatra/rack_etag.rb, line 40 def call(env) status, headers, body = @app.call(env) if etag_status?(status) && etag_body?(body) && !http_caching?(headers) digest, body = digest_body(body) headers['ETag'] = %("#{digest}") if digest end if not headers['Cache-Control'] and digest headers['Cache-Control'] = digest ? @cache_control : @no_cache_control end [status, headers, body] end
Generated with the Darkfish Rdoc Generator 2.