Increase browser cache TTL in Varnish VCL 4.0

Static_browser_cache.vcl

    # Cache statics
    if ((bereq.url ~ "\.(css)(?=\?|&|$)" && beresp.http.Content-Type ~ "text/css")
        || (bereq.url ~ "\.(jpe?g|png|gif|ico)(?=\?|&|$)" && beresp.http.Content-Type ~ "image/")
        || (bereq.url ~ "\.(js)(?=\?|&|$)" && beresp.http.Content-Type ~ "javascript")
        || (bereq.url ~ "\.(swf)(?=\?|&|$)" && beresp.http.Content-Type ~ "application/x-shockwave-flash")
        || (bereq.url ~ "\.(woff)(?=\?|&|$)" && beresp.http.Content-Type ~ "font")) {

        set beresp.http.Cache-Control = "public, max-age=604800"

    }