fix(static): UI does not send requests to registry under non-root url (#73)

Add example for this issue
fixes: #73

examples/issue-73/docker-compose.yml

@@ -0,0 +1,31 @@
+version: '2.0'
+services:
+  registry:
+    image: registry:2.6.2
+    volumes:
+      - ./registry-data:/var/lib/registry
+    networks:
+      - registry-ui-net
+
+  ui:
+    image: joxit/docker-registry-ui:static
+    environment:
+      - REGISTRY_TITLE=My Private Docker Registry
+      - REGISTRY_URL=http://registry:5000
+    depends_on:
+      - registry
+    networks:
+      - registry-ui-net
+
+  proxy:
+    image: nginx:alpine
+    volumes:
+      - ./nginx.conf:/etc/nginx/conf.d/default.conf
+    ports:
+      - 80:80
+    depends_on:
+      - ui
+    networks:
+      - registry-ui-net
+networks:
+  registry-ui-net:

examples/issue-73/nginx.conf

@@ -0,0 +1,35 @@
+server {
+    listen       80;
+    server_name  localhost;
+    resolver 127.0.0.11; # This is for docker container name resolver
+    #charset koi8-r;
+    #access_log  /var/log/nginx/host.access.log  main;
+
+    # disable any limits to avoid HTTP 413 for large image uploads
+    client_max_body_size 0;
+
+    # required to avoid HTTP 411: see Issue #1486 (https://github.com/moby/moby/issues/1486)
+    chunked_transfer_encoding on;
+    # required for strict SNI checking: see Issue #70 (https://github.com/Joxit/docker-registry-ui/issues/70)
+    proxy_ssl_server_name on;
+
+    location /ui/ {
+        proxy_pass http://ui/;
+    }
+
+    #error_page  404              /404.html;
+
+    # redirect server error pages to the static page /50x.html
+    #
+    error_page   500 502 503 504  /50x.html;
+    location = /50x.html {
+        root   /usr/share/nginx/html;
+    }
+
+    # deny access to .htaccess files, if Apache's document root
+    # concurs with nginx's one
+    #
+    #location ~ /\.ht {
+    #    deny  all;
+    #}
+}