Enhancement: fully support custom headers (#6125)

docs/configs/docker.md

@@ -189,6 +189,8 @@ labels: ...
   - homepage.widgets[1].slug=youreventslughere
 ```
 
+To pass custom HTTP headers with a widget request when using labels, use the same dot-notation: `homepage.widget.headers.X-Auth-Key=secret` (or `homepage.widgets[0].headers.X-Auth-Key=secret` when multiple widgets are present).
+
 You can add specify fields for e.g. the [CustomAPI](../widgets/services/customapi.md) widget by using array-style dot notation:
 
 ```yaml

docs/configs/kubernetes.md

@@ -94,6 +94,7 @@ metadata:
     gethomepage.dev/name: Emby
     gethomepage.dev/widget.type: "emby"
     gethomepage.dev/widget.url: "https://emby.example.com"
+    gethomepage.dev/widget.headers.X-Auth-Key: "your-secret-here"
     gethomepage.dev/pod-selector: ""
     gethomepage.dev/weight: 10 # optional
     gethomepage.dev/instance: "public" # optional

docs/configs/services.md

@@ -101,6 +101,25 @@ Each service can have multiple widgets attached to it, for example:
 
       Multiple widgets per service are not yet supported with Kubernetes ingress annotations.
 
+#### Custom HTTP headers
+
+Widgets that make HTTP calls support extra request headers via `headers`. This is useful when a reverse proxy expects a secret header.
+
+```yaml
+- UptimeRobot:
+    icon: uptimekuma.png
+    href: https://uptimerobot.com/
+    widget:
+      type: uptimerobot
+      url: https://api.uptimerobot.com
+      key: ${UPTIMEROBOT_API_KEY}
+      headers:
+        User-Agent: homepage
+        X-Auth-Key: your-secret-here
+```
+
+If you define services via Docker labels or Kubernetes annotations, use the same key with dot-notation (for example `homepage.widget.headers.X-Auth-Key=secret` or `gethomepage.dev/widget.headers.X-Auth-Key: "secret"`).
+
 #### Field Visibility
 
 Each widget can optionally provide a list of which fields should be visible via the `fields` widget property. If no fields are specified, then all fields will be displayed. The `fields` property must be a valid YAML array of strings. As an example, here is the entry for Sonarr showing only a couple of fields.