fix: don't use default nginx image error page

Dockerfile.alpine

@@ -22,7 +22,8 @@ RUN echo -e "\ninclude /etc/nginx/toplevel.conf.d/*.conf;" >> /etc/nginx/nginx.c
    && sed -i -e '/^\}$/{s//\}\nworker_rlimit_nofile 20480;/;:a' -e '$!N;$!ba' -e '}' /etc/nginx/nginx.conf \
    && mkdir -p '/etc/nginx/toplevel.conf.d' \
    && mkdir -p '/etc/nginx/dhparam' \
-   && mkdir -p '/etc/nginx/certs'
+   && mkdir -p '/etc/nginx/certs' \
+   && mkdir -p '/usr/share/nginx/html/errors'
 
 # Install Forego + docker-gen
 COPY --from=forego /usr/local/bin/forego /usr/local/bin/forego

Dockerfile.debian

@@ -19,7 +19,8 @@ RUN echo "\ninclude /etc/nginx/toplevel.conf.d/*.conf;" >> /etc/nginx/nginx.conf
    && sed -i -e '/^\}$/{s//\}\nworker_rlimit_nofile 20480;/;:a' -e '$!N;$!ba' -e '}' /etc/nginx/nginx.conf \
    && mkdir -p '/etc/nginx/toplevel.conf.d' \
    && mkdir -p '/etc/nginx/dhparam' \
-   && mkdir -p '/etc/nginx/certs'
+   && mkdir -p '/etc/nginx/certs' \
+   && mkdir -p '/usr/share/nginx/html/errors'
 
 # Install Forego + docker-gen
 COPY --from=forego /usr/local/bin/forego /usr/local/bin/forego

docs/README.md

@@ -799,14 +799,14 @@ Per virtual-host `servers_tokens` directive can be configured by passing appropr
 
 ### Custom error page
 
-To override the default (nginx provided) error page displayed on 50x errors, mount your custom HTML error page inside the container at `/usr/share/nginx/html/50x.html`:
+To override the default (nginx provided) error page displayed on 50x errors, mount your custom HTML error page inside the container at `/usr/share/nginx/html/errors/50x.html`:
 
 ```console
 docker run --detach \
     --name nginx-proxy \
     --publish 80:80 \
     --volume /var/run/docker.sock:/tmp/docker.sock:ro \
-    --volume /path/to/error.html:/usr/share/nginx/html/50x.html:ro \
+    --volume /path/to/error.html:/usr/share/nginx/html/errors/50x.html:ro \
     nginxproxy/nginx-proxy:1.5
 ```
 

nginx.tmpl

@@ -703,10 +703,10 @@ server {
     }
         {{- end }}
 
-        {{- if (exists "/usr/share/nginx/html/50x.html") }}
+        {{- if (exists "/usr/share/nginx/html/errors/50x.html") }}
     error_page 500 502 503 504 /50x.html;
     location /50x.html {
-        root /usr/share/nginx/html;
+        root /usr/share/nginx/html/errors;
         internal;
     }
         {{- end }}

test/test_custom-error-page/test_custom-error-page.yml

@@ -5,4 +5,4 @@ services:
     image: nginxproxy/nginx-proxy:test
     volumes:
       - /var/run/docker.sock:/tmp/docker.sock:ro
-      - ./50x.html:/usr/share/nginx/html/50x.html:ro
+      - ./50x.html:/usr/share/nginx/html/errors/50x.html:ro