What is pipe mode and varnish skip mode

Question

what is pipe mode and transfer mode in lacquer cache ... I tried to link to this link to understand varnish. I understand a little, but I would like a better explanation. http://spin.atomicobject.com/2013/01/16/speed-up-website-varnish/

Answer 1

Pass mode is very common in Varnish and simply tells Varnish to pass the request to the backend, rather than trying and serving it from the cache. This is used for dynamic pages that cannot be cached. Example:

sub vcl_recv { if (req.url ~ "^/myprofile") { return (pass) } } 

The pipe mode is completely different and rarely used. If you want to transfer objects, such as video, you need to use the channel to avoid timeouts. Using pipe means that Varnish stops checking every request and just sends bytes directly to the server. When using the pipe, there are several errors at startup, so be sure to check using the protocol in the varnish documents.

Example:

 sub vcl_recv { if (req.url ~ "^/video/stream/") { return (pipe) } } sub vcl_pipe { # http://www.varnish-cache.org/ticket/451 # This forces every pipe request to be the first one. set bereq.http.connection = "close"; }