How to set Varnish so that it doesn't cache URL -

after waiting error time out:

error 503 service unavailable service unavailable varnish

i have tried:

if (req.http.host == "domain.com" && req.url == "/nextopia/") {     return (pass); }

and:

if (req.url ~ "^/nextopia/") {   return (pass); }

and:

.first_byte_timeout = 600s; .between_bytes_timeout = 600s;

but not effective, how export it??!! :(

the ~ matching need match url, like:

if (req.url ~ "/nextopia") {     return (pass); }

without using regex roof. req.url == "/nextopia/" match of exact /nextopia/ /nextopia wont match..

have check logs see if there error timeouts and/or other errors? cheers

O9