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# Recommended varnishncsa logging format: '%h %l %u %t "%m %{X-Forwarded-Proto}i://%{Host}i%U%q %H" %s %b "%{Referer}i" "%{User-agent}i"'
# Please use Varnish 7.0+ for proper Range Requests / Chunked encoding support
vcl 4.1;
import std;
backend default {
.host = "127.0.0.1";
.port = "4000";
}
# ACL for IPs that are allowed to PURGE data from the cache
acl purge {
"127.0.0.1";
}
sub vcl_recv {
# Redirect HTTP to HTTPS
if (std.port(server.ip) != 443) {
set req.http.X-Forwarded-Proto = "http";
set req.http.x-redir = "https://" + req.http.host + req.url;
return (synth(750, ""));
} else {
set req.http.X-Forwarded-Proto = "https";
}
# Pipe if WebSockets request is coming through
if (req.http.upgrade ~ "(?i)websocket") {
return (pipe);
}
# Allow purging of the cache
if (req.method == "PURGE") {
if (!client.ip ~ purge) {
return (synth(405,"Not allowed."));
}
return (purge);
}
}
sub vcl_backend_response {
# gzip text content
if (beresp.http.content-type ~ "(text|text/css|application/x-javascript|application/javascript)") {
set beresp.do_gzip = true;
}
# Retry broken backend responses.
if (beresp.status == 503) {
set bereq.http.X-Varnish-Backend-503 = "1";
return (retry);
}
# Bypass cache for large files
# 50000000 ~ 50MB
if (std.integer(beresp.http.content-length, 0) > 50000000) {
set beresp.uncacheable = true;
return (deliver);
}
# Don't cache objects that require authentication
if (beresp.http.Authorization && !beresp.http.Cache-Control ~ "public") {
set beresp.uncacheable = true;
return (deliver);
}
# Allow serving cached content for 6h in case backend goes down
set beresp.grace = 6h;
# Do not cache 5xx responses
if (beresp.status == 500 || beresp.status == 502 || beresp.status == 503 || beresp.status == 504) {
set beresp.uncacheable = true;
return (abandon);
}
# Do not cache redirects and errors
if ((beresp.status >= 300) && (beresp.status < 500)) {
set beresp.uncacheable = true;
set beresp.ttl = 30s;
return (deliver);
}
}
# The synthetic response for 301 redirects
sub vcl_synth {
if (resp.status == 750) {
set resp.status = 301;
set resp.http.Location = req.http.x-redir;
return (deliver);
}
}
# Ensure WebSockets through the pipe do not close prematurely
sub vcl_pipe {
if (req.http.upgrade) {
set bereq.http.upgrade = req.http.upgrade;
set bereq.http.connection = req.http.connection;
}
}
sub vcl_backend_fetch {
# Be more lenient for slow servers on the fediverse
if (bereq.url ~ "^/proxy/") {
set bereq.first_byte_timeout = 300s;
}
if (bereq.retries == 0) {
# Clean up the X-Varnish-Backend-503 flag that is used internally
# to mark broken backend responses that should be retried.
unset bereq.http.X-Varnish-Backend-503;
} else {
if (bereq.http.X-Varnish-Backend-503) {
if (bereq.method != "POST" &&
std.healthy(bereq.backend) &&
bereq.retries <= 4) {
# Flush broken backend response flag & try again.
unset bereq.http.X-Varnish-Backend-503;
} else {
return (abandon);
}
}
}
}
sub vcl_backend_error {
# Retry broken backend responses.
set bereq.http.X-Varnish-Backend-503 = "1";
return (retry);
}
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