RedMine Create Issue Containing HTML through API - redmine

Question

I have a webhook which automatically opens tickets from our customer support software Freshdesk in Redmine. The description from the support software is sent containing plain HTML. When passing this to the Redmine API to create an issue, the description is created with the HTML and it is very difficult to read.
Example in request:
{
"issue":
{ "project_id": 62
, "priority_id": 6
, "tracker_id": 12
, "status_id": 6
, "assigned_to_id": 23
, "subject": "Freshdesk - {{ticket.subject}}"
, "description": "Product - {{ticket.portal_name}}\n\nDescription:\n<div>this is a div</div>\n\nLast Public Comment\n{{ticket.latest_public_comment}}\n\nLast Private Comment\n{{ticket.latest_private_comment}}\n\nAgent Email - {{ticket.agent.email}}\nFreshdesk URL - {{ticket.url}}"
}
}
In Redmine:
Product - Product Name
Description: <div>this is a div</div>
Last Public Comment public comment
Last Private Comment Private comment
Agent Email - agentemail#ticket.com
Freshdesk URL - www.freshdesk.com

Answer 1

Note: This issue is not linked to the Redmine API. You would have the same problem if you were to copy paste this directly into the issue description field.
What you want to achieve is not possible natively, as div tags are escaped.
You would need to change this line and add in the tags you want Redmine to keep:
ALLOWED_TAGS = %w(redpre pre code notextile div form input)
Be careful though, as this could mess up your layout and/or be potentially unsafe.