issues.vcl

# This is a basic VCL configuration file for varnish.  See the vcl(7)
# man page for details on VCL syntax and semantics.

# backend definition
backend default {
    .host = "tracker.phpbb.com";
    .port = "80";
}

# transformations on client requests
sub vcl_recv {
    # set host to backend host, otherwise client host is passed through
    set req.http.host = "tracker.phpbb.com";

    # /s/ and /images/ are static file urls.
    # header-separator and dropdowns are images which are not session-dependent.
    # clear cookies from client requests, which will allow such requests to be cached
    # http://varnish-cache.org/wiki/VCLExampleCacheCookies
    if (req.url ~ "^/(s|images)/" || req.url ~ "^/rest/api/1.0/(header-separator|dropdowns)($|\?)") {
        unset req.http.cookie;
    }

    # clean out requests sent via curls -X mode and LWP
    # http://varnish-cache.org/wiki/VCLExampleNormalizingReqUrl
    if (req.url ~ "^http://") {
        set req.url = regsub(req.url, "http://[^/]*", "");
    }

    # normalize accept-encoding header
    # http://varnish-cache.org/wiki/FAQ/Compression
    if (req.http.Accept-Encoding) {
        if (req.url ~ "\.(jpg|png|gif|gz|tgz|bz2|tbz|mp3|ogg)$") {
            # No point in compressing these
            remove req.http.Accept-Encoding;
        } elsif (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;
        }
    }
}

# transformations on backend responses
sub vcl_fetch {
    # /s/ and /images/ are static file urls.
    # header-separator and dropdowns are images which are not session-dependent.
    # if response contains any cookies, remove cookies before storing response in cache
    # and returning it to client.
    # note: incoming cookies are removed in vcl_recv block
    if (req.url ~ "^/(s|images)/" || req.url ~ "^/rest/api/1.0/(header-separator|dropdowns)($|\?)") {
        unset beresp.http.set-cookie;
    }

    # offsite use only - rewrite location header in redirects
    # http://varnish-cache.org/wiki/VCLExampleRemovingSomeCookies
    if (beresp.http.location) {
        set beresp.http.location = regsub(beresp.http.location, "^http://tracker.phpbb.com/", "/");
    }
}