• I read the Generative AI policy and my contribution is either not created with the help of AI or is compatible with the policy and GNU/GPL 2 or later.

Summary of Changes

The plg_task_requests GET routine could only send a single, fixed Authorization header. Any API that needs a different header (X-API-Key, Accept, User-Agent), could not be called from a scheduled task. Additionally, some hosters block requests that arrive without a User-Agent header, so a scheduled GET Request task against those endpoints simply fails.

This PR adds a repeatable subform to the GET request to set custom headers.

Testing Instructions

• Create a new GET Request Task in the scheduled task component: /administrator/index.php?option=com_scheduler&view=tasks
• Use an endpoint that echoes request headers as the URL, e.g. https://webhook.site
• Enter some headers and run the task
• Check that they arrive in tmp/task_<id>_response.html

Actual result BEFORE applying this Pull Request

No way to set custom headers (except Authorization header)

Expected result AFTER applying this Pull Request

Repeatable custom headers table. The original authorization fields still exist for backwards compatibility.

Link to documentations

Please select:

• Documentation link for guide.joomla.org:

• No documentation changes for guide.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed