Add DISABLE_IPV6 to ignore AAAA records when proxying requests

Dockerfile

@@ -117,5 +117,8 @@ ENV PROXY_CONNECT_READ_TIMEOUT="60s"
 ENV PROXY_CONNECT_CONNECT_TIMEOUT="60s"
 ENV PROXY_CONNECT_SEND_TIMEOUT="60s"
 
+# Disable use of IPv6 hosts for outbound proxy requests if set to true
+ENV DISABLE_IPV6="false"
+
 # Did you want a shell? Sorry, the entrypoint never returns, because it runs nginx itself. Use 'docker exec' if you need to mess around internally.
 ENTRYPOINT ["/entrypoint.sh"]

README.md

@@ -102,6 +102,7 @@ ENV PROXY_REQUEST_BUFFERING="true"
   - PROXY_CONNECT_READ_TIMEOUT : see [proxy_connect_read_timeout](https://github.com/chobits/ngx_http_proxy_connect_module#proxy_connect_read_timeout)
   - PROXY_CONNECT_CONNECT_TIMEOUT : see [proxy_connect_connect_timeout](https://github.com/chobits/ngx_http_proxy_connect_module#proxy_connect_connect_timeout)
   - PROXY_CONNECT_SEND_TIMEOUT : see [proxy_connect_send_timeout](https://github.com/chobits/ngx_http_proxy_connect_module#proxy_connect_send_timeout))
+- Env `DISABLE_IPV6`: If you have problems with `nginx` attempting to connect to hosts over IPv6 but your network doesn't properly support IPv6, set this to `true` to ignore IPv6 AAAA records in DNS responses.
 
 
 ### Simple (no auth, all cache)

entrypoint.sh

@@ -25,7 +25,11 @@ echo "DEBUG, determined RESOLVERS from /etc/resolv.conf: '$RESOLVERS'"
 conf=""
 for ONE_RESOLVER in ${RESOLVERS}; do
 	echo "Possible resolver: $ONE_RESOLVER"
-	conf="resolver $ONE_RESOLVER; "
+	if [[ "a${DISABLE_IPV6}" == "atrue" ]]; then
+		conf="resolver $ONE_RESOLVER ipv6=off; "
+	else
+		conf="resolver $ONE_RESOLVER; "
+	fi
 done
 
 echo "Final chosen resolver: $conf"