As enterprises continue to adopt Drupal for building and deploying high performance web applications, the need for high-performance caching becomes integral to their implementation strategy. Acquia and Varnish partner to deliver the ideal caching solution for optimizing web performance allowing developers to focus on creating great websites. Acquia will discuss how we've implemented Varnish in Acquia Hosting to improve performance for our customers, as well as the best practices that can help improve performance of any Drupal website. Join us for this complimentary webinar where we'll discuss: - Considerations for managing a high-performance site - How to manage caching behaviors in Drupal - Tools and tips for improving site performance

3. Varnish + Drupal Accelerating Drupal Performance and Flexibility with Varnish Cache Kurt Gray Hosting Engineer Acquia Inc. @kurt Kristian Lyngstøl Software Engineer Varnish Software @kristian Matt Ackley Marketing Acquia Inc. @mbackley

27. Varnish and Drupal: VCL snippets © 2010 Acquia, Inc. sub vcl_recv { # Normalize the Accept-Encoding header if (req.http.Accept-Encoding) { if (req.http.Accept-Encoding ~ "gzip") { set req.http.Accept-Encoding = "gzip"; } elsif (req.http.Accept-Encoding ~ "deflate") { set req.http.Accept-Encoding = "deflate"; } else { # unkown algorithm remove req.http.Accept-Encoding; } } }

28. Varnish and Drupal: VCL snippets © 2010 Acquia, Inc. sub vcl_recv { # Don't check cache for logged-in users if(req.http.cookie ~ "SESS") { return(pass); } # Cookie Bypass module: Don't check cache for anon # user who POSTed content less than 10 minutes ago. if(req.http.cookie ~ "NO_CACHE") { return(pass); } }

29. Varnish and Drupal: VCL snippets © 2010 Acquia, Inc. sub vcl_recv { # Don't check cache for GET /cron.php if(req.url ~ "^/cron.php") { return(pass); } }

30. Varnish and Drupal: VCL snippets © 2010 Acquia, Inc. sub vcl_fetch { # Don't cache if response has explicit no-cache headers if (beresp.http.Pragma ~ "no-cache" || beresp.http.Cache-Control ~ "no-cache" || beresp.http.Cache-Control ~ "private") { return(pass); } }