Fix email links when using Docker with Gulp

{{cookiecutter.project_slug}}/config/settings/local.py

@@ -11,7 +11,7 @@ SECRET_KEY = env(
     default="!!!SET DJANGO_SECRET_KEY!!!",
 )
 # https://docs.djangoproject.com/en/dev/ref/settings/#allowed-hosts
-ALLOWED_HOSTS = ["localhost",{% if cookiecutter.js_task_runner == 'Gulp' and cookiecutter.use_docker == 'y' %} "django",{% endif %} "0.0.0.0", "127.0.0.1"]
+ALLOWED_HOSTS = ["localhost", "0.0.0.0", "127.0.0.1"]
 
 # CACHES
 # ------------------------------------------------------------------------------

{{cookiecutter.project_slug}}/gulpfile.js

@@ -127,12 +127,21 @@ function initBrowserSync() {
         `${paths.js}/*.js`,
         `${paths.templates}/*.html`
       ], {
+        // https://www.browsersync.io/docs/options/#option-proxy
         {%- if cookiecutter.use_docker == 'n' %}
-        proxy: "localhost:8000"
+        proxy: 'localhost:8000'
         {% else %}
-        proxy:  "django:8000",
-        // Browsersync may open the browser when ready, but it doesn't work from
-        // inside a container, so set this option to false
+        proxy:  {
+          target: 'django:8000',
+          proxyReq: [
+            function(proxyReq) {
+              // Set to the browsersync host & port to have email links working
+              proxyReq.setHeader('Host', 'localhost:3000')
+            }
+          ]
+        }
+        // https://www.browsersync.io/docs/options/#option-open
+        // Disable as it doesn't work from inside a container
         open: false
         {%- endif %}
       }

{{cookiecutter.project_slug}}/local.yml

@@ -95,6 +95,7 @@ services:
     command: npm run dev
     ports:
       - "3000:3000"
+      # Expose browsersync UI: https://www.browsersync.io/docs/options/#option-ui
       - "3001:3001"
 
   {%- endif %}