add example with custom header (Gitlab)

docs/40_Examples.md

@@ -164,3 +164,28 @@ http.setAuth
 http.makeRequest GET "api"
 http.makeRequest GET "app"
 ```
+
+## Gitlab access token
+
+Gitlab uses the value `PRIVATE-TOKEN: <token>` in the request header for authorization.
+Here we need `http.addHeader` to add a custom header line.
+
+```sh
+URL='https://gitlab.example.com/api/v4'
+TOKEN='<add-your-token-here>' # glpat-**********
+
+# ---------- init
+
+http.init
+http.addHeader "PRIVATE-TOKEN: $TOKEN"
+http.setBaseUrl "$URL"
+
+# ---------- Requests to api
+
+http.makeRequest /users
+http.getResponse | jq
+
+http.makeRequest /projects
+http.getResponse | jq
+
+```