From 1843371641f5b3898893df91094412eaeedc8807 Mon Sep 17 00:00:00 2001
From: Guilhem Moulin <guilhem@fripost.org>
Date: Wed, 21 May 2025 23:45:10 +0200
Subject: 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
---
 files/etc/nginx/sites-available/webmap | 6 ++++--
 tasks/httpd.yml                        | 4 ++--
 2 files changed, 6 insertions(+), 4 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;
     }
 
diff --git a/tasks/httpd.yml b/tasks/httpd.yml
index 2e1fa98..ea2dee0 100644
--- a/tasks/httpd.yml
+++ b/tasks/httpd.yml
@@ -55,8 +55,8 @@
         owner=root group=root
         mode=0755
 
-- name: Create /var/www/webmap/_.txt
-  copy: dest=/var/www/webmap/_.txt content=""
+- name: Create /var/www/webmap/_empty
+  copy: dest=/var/www/webmap/_empty content=""
         owner=root group=root
         mode=0644
 
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