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- 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-redir = "https://" + req.http.host + req.url;
- return (synth(750, ""));
- }
-
- # CHUNKED SUPPORT
- if (req.http.Range ~ "bytes=") {
- set req.http.x-range = req.http.Range;
- }
-
- # 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);
- }
-
- # CHUNKED SUPPORT
- if (bereq.http.x-range ~ "bytes=" && beresp.status == 206) {
- set beresp.ttl = 10m;
- set beresp.http.CR = beresp.http.content-range;
- }
-
- # 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_hash {
- # CHUNKED SUPPORT
- if (req.http.x-range ~ "bytes=") {
- hash_data(req.http.x-range);
- unset req.http.Range;
- }
- }
-
- sub vcl_backend_fetch {
- # Be more lenient for slow servers on the fediverse
- if bereq.url ~ "^/proxy/" {
- set bereq.first_byte_timeout = 300s;
- }
-
- # CHUNKED SUPPORT
- if (bereq.http.x-range) {
- set bereq.http.Range = bereq.http.x-range;
- }
-
- 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_deliver {
- # CHUNKED SUPPORT
- if (resp.http.CR) {
- set resp.http.Content-Range = resp.http.CR;
- unset resp.http.CR;
- }
- }
-
- sub vcl_backend_error {
- # Retry broken backend responses.
- set bereq.http.X-Varnish-Backend-503 = "1";
- return (retry);
- }
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