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