HTTPd: Use `Content-Type: application/x-empty` for 404 error pages.

This matches PHP's finfo_file() behavior for empty files, cf.
https://stackoverflow.com/questions/24015038/why-does-php-file-info-return-inode-x-empty-for-empty-text-files

1 files changed, 4 insertions, 2 deletions

diff --git a/files/etc/nginx/sites-available/webmap b/files/etc/nginx/sites-available/webmap
index 6921c2c..32937fa 100644
--- a/files/etc/nginx/sites-available/webmap
+++ b/files/etc/nginx/sites-available/webmap
@@ -65,7 +65,8 @@ server {
         expires 8h;
         brotli_static on;
         try_files $uri =404;
-        error_page 404 /_.txt;
+        # service an empty payload to save bandwidth
+        error_page 404 /_empty;
     }
     location = /tiles/metadata.json {
         expires epoch;
@@ -73,11 +74,12 @@ server {
         try_files $uri =404;
     }
 
-    location = /_.txt {
+    location = /_empty {
         # cache 404 responses for 8h like for valid tiles
         add_header Strict-Transport-Security "max-age=31557600; includeSubDomains" always;
         add_header Cache-Control "public; max-age=28800" always;
         #add_header Access-Control-Allow-Origin "*" always;
+        default_type application/x-empty;
         internal;
     }