1 # 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"'
10 # ACL for IPs that are allowed to PURGE data from the cache
16 # Redirect HTTP to HTTPS
17 if (std.port(server.ip) != 443) {
18 set req.http.X-Forwarded-Proto = "http";
19 set req.http.x-redir = "https://" + req.http.host + req.url;
20 return (synth(750, ""));
22 set req.http.X-Forwarded-Proto = "https";
26 if (req.http.Range ~ "bytes=") {
27 set req.http.x-range = req.http.Range;
30 # Pipe if WebSockets request is coming through
31 if (req.http.upgrade ~ "(?i)websocket") {
35 # Allow purging of the cache
36 if (req.method == "PURGE") {
37 if (!client.ip ~ purge) {
38 return(synth(405,"Not allowed."));
44 sub vcl_backend_response {
46 if (beresp.http.content-type ~ "(text|text/css|application/x-javascript|application/javascript)") {
47 set beresp.do_gzip = true;
50 # Retry broken backend responses.
51 if (beresp.status == 503) {
52 set bereq.http.X-Varnish-Backend-503 = "1";
57 if (bereq.http.x-range ~ "bytes=" && beresp.status == 206) {
59 set beresp.http.CR = beresp.http.content-range;
62 # Don't cache objects that require authentication
63 if (beresp.http.Authorization && !beresp.http.Cache-Control ~ "public") {
64 set beresp.uncacheable = true;
68 # Allow serving cached content for 6h in case backend goes down
69 set beresp.grace = 6h;
71 # Do not cache 5xx responses
72 if (beresp.status == 500 || beresp.status == 502 || beresp.status == 503 || beresp.status == 504) {
73 set beresp.uncacheable = true;
77 # Do not cache redirects and errors
78 if ((beresp.status >= 300) && (beresp.status < 500)) {
79 set beresp.uncacheable = true;
85 # The synthetic response for 301 redirects
87 if (resp.status == 750) {
88 set resp.status = 301;
89 set resp.http.Location = req.http.x-redir;
94 # Ensure WebSockets through the pipe do not close prematurely
96 if (req.http.upgrade) {
97 set bereq.http.upgrade = req.http.upgrade;
98 set bereq.http.connection = req.http.connection;
104 if (req.http.x-range ~ "bytes=") {
105 hash_data(req.http.x-range);
106 unset req.http.Range;
110 sub vcl_backend_fetch {
111 # Be more lenient for slow servers on the fediverse
112 if (bereq.url ~ "^/proxy/") {
113 set bereq.first_byte_timeout = 300s;
117 if (bereq.http.x-range) {
118 set bereq.http.Range = bereq.http.x-range;
121 if (bereq.retries == 0) {
122 # Clean up the X-Varnish-Backend-503 flag that is used internally
123 # to mark broken backend responses that should be retried.
124 unset bereq.http.X-Varnish-Backend-503;
126 if (bereq.http.X-Varnish-Backend-503) {
127 if (bereq.method != "POST" &&
128 std.healthy(bereq.backend) &&
129 bereq.retries <= 4) {
130 # Flush broken backend response flag & try again.
131 unset bereq.http.X-Varnish-Backend-503;
142 set resp.http.Content-Range = resp.http.CR;
147 sub vcl_backend_error {
148 # Retry broken backend responses.
149 set bereq.http.X-Varnish-Backend-503 = "1";