我有一个简单的 PHP 索引文件网站，如果在端口 8080 上刷新，它会改变颜色，但由于以下 default.vcl，可以正确显示具有相同颜色的页面的缓存版本：
vcl 4.0;
# This is where your content lives. Adjust it to point at your web server.
backend default {
.host = "xx.xx.xx.xx";
.port = "8080";
}
# The only thing stopping Varnish from caching properly by default in most
# cases is the presence of cookies. Strip them, and voila, cache works.
sub vcl_recv {
# We leave cookies for content under "/user".
if (req.url !~ "^/user") {
unset req.http.cookie;
}
}
# That's all you need, but you might want to start adjusting cache duration
# too! You can do that by emitting "Cache-Control: s-maxage=123" from your
# backend server, telling Varnish to cache for 123 seconds. That requires 0
# configuration, but the following snippet removes "s-maxage" from the
# response before it is sent to the client, so as not to confuse other
# proxy servers between you and the client.
sub strip_smaxage {
# Remove white space
set beresp.http.cache-control = regsuball(beresp.http.cache-control, " ","");
# strip s-maxage - Varnish has already used it
set beresp.http.cache-control = regsub(beresp.http.cache-control, "s-maxage=[0-9]+\b","");
# Strip extra commas
set beresp.http.cache-control = regsub(beresp.http.cache-control, "(^,|,$|,,)", "");
}
# This just calls the above function at the appropriate time.
sub vcl_backend_response {
call strip_smaxage;
}
# You can read more about control Varnish through headers at
# https://varnishfoo.info/chapter-2.html
但是，我需要在同一台服务器上托管一个 Drupal 网站，因此我用以下内容替换了 default.vcl 文件：
vcl 4.0;
backend default {
.host = "xx.xx.xx.xx";
.port = "8080";
}
acl purge {
"localhost";
"127.0.0.1";
}
sub vcl_recv {
# Check the incoming request type is "PURGE", not "GET" or "POST".
if (req.method == "PURGE") {
# Check if the IP is allowed.
if (!client.ip ~ purge) {
# Return error code 405 (Forbidden) when not.
return (synth(405, "Not allowed."));
}
return (purge);
}
# Do not cache these paths.
if (req.url ~ "^/status\.php$" ||
req.url ~ "^/update\.php" ||
req.url ~ "^/install\.php" ||
req.url ~ "^/apc\.php$" ||
req.url ~ "^/admin" ||
req.url ~ "^/admin/.*$" ||
req.url ~ "^/user" ||
req.url ~ "^/user/.*$" ||
req.url ~ "^/users/.*$" ||
req.url ~ "^/info/.*$" ||
req.url ~ "^/flag/.*$" ||
req.url ~ "^.*/ajax/.*$" ||
req.url ~ "^.*/ahah/.*$" ||
req.url ~ "^/system/files/.*$") {
return (pass);
}
# Always cache the following file types for all users. This list of extensions
# appears twice, once here and again in vcl_backend_response so make sure you edit both
# and keep them equal.
if (req.url ~ "(?i)\.(pdf|asc|dat|txt|doc|xls|ppt|tgz|csv|png|gif|jpeg|jpg|ico|swf|css|js)(\?.*)?$") {
unset req.http.Cookie;
}
# Remove all cookies that Drupal doesn't need to know about. We explicitly
# list the ones that Drupal does need, the SESS and NO_CACHE. If, after
# running this code we find that either of these two cookies remains, we
# will pass as the page cannot be cached.
if (req.http.Cookie) {
# 1. Append a semi-colon to the front of the cookie string.
# 2. Remove all spaces that appear after semi-colons.
# 3. Match the cookies we want to keep, adding the space we removed
# previously back. (\1) is first matching group in the regsuball.
# 4. Remove all other cookies, identifying them by the fact that they have
# no space after the preceding semi-colon.
# 5. Remove all spaces and semi-colons from the beginning and end of the
# cookie string.
set req.http.Cookie = ";" + req.http.Cookie;
set req.http.Cookie = regsuball(req.http.Cookie, "; +", ";");
set req.http.Cookie = regsuball(req.http.Cookie, ";(SESS[a-z0-9]+|SSESS[a-z0-9]+|NO_CACHE)=", "; \1=");
set req.http.Cookie = regsuball(req.http.Cookie, ";[^ ][^;]*", "");
set req.http.Cookie = regsuball(req.http.Cookie, "^[; ]+|[; ]+$", "");
if (req.http.Cookie == "") {
# If there are no remaining cookies, remove the cookie header. If there
# aren't any cookie headers, Varnish's default behavior will be to cache
# the page.
unset req.http.Cookie;
}
else {
# If there is any cookies left (a session or NO_CACHE cookie), do not
# cache the page. Pass it on to Apache directly.
return (pass);
}
}
}
它可以很好地缓存 Drupal 网站，但会破坏其他“常规”网站，因为它会在端口 80（Varnish 缓存）和 8080（Apache）版本上每次刷新页面时开始改变颜色。
什么才是 default.vcl 文件的正确内容才能覆盖 Drupal 和非 Drupal 网站？
答案1
尝试不同的组合我发现只需合并if (req.http.host == "non-drupal-site.com") {到sub vcl_recv第二个（Drupal）配置文件的部分即可，如下所示：
sub vcl_recv {
if (req.http.host == "non-drupal-site.com") {
if (req.url !~ "^/user") {
unset req.http.cookie;
}
}
运行正常并达到了预期的效果：Drupal 页面缓存正确，而且简单网站的颜色缓存完整。