Support HTMX response headers

Proposed feature

A second control in the base library of HTMX is a set of custom response headers. The available headers are:

HX-Location

allows you to do a client-side redirect that does not do a full page reload

HX-Push-Url

pushes a new url into the history stack

HX-Redirect

can be used to do a client-side redirect to a new location

HX-Refresh

if set to “true” the client-side will do a full refresh of the page

HX-Replace-Url

replaces the current URL in the location bar

HX-Reswap

allows you to specify how the response will be swapped. See hx-swap for possible values

HX-Retarget

a CSS selector that updates the target of the content update to a different element on the page

HX-Reselect

a CSS selector that allows you to choose which part of the response is used to be swapped in. Overrides an
existing hx-select on the triggering element

HX-Trigger

allows you to trigger client-side events

HX-Trigger-After-Settle

allows you to trigger client-side events after the settle step

HX-Trigger-After-Swap

allows you to trigger client-side events after the swap step

Remaining tasks

Create an HtmxHeader class that uses a Symfony HeaderBag for storage.

User interface changes

API changes

Data model changes