WebDev- How can I respond HTTP code 204

gnguyen · November 30, 2019, 4:05pm

Hello everyone,
Using WebDev, I’ve to respond to a callback and the server accept only a code 204 No Content as a response. It seems that webdev answer 200 by default if there is nothing return.
How can I do that?
Many thanks

pturmel · December 1, 2019, 6:56pm

You should be able to do it directly with the servletResponse from the request, hinted at in the manual. You must return None to prevent normal handling of a webdev dictionary response.

Something like this:

    response = request['servletResponse']
    response.status = 204
    return None

gnguyen · December 2, 2019, 6:04am

Hi,

Thanks, that’s perfect.

pascal.fragnoud · January 6, 2025, 1:01pm

For those encountering this post in 2025, like I am now:
It seems returning a dict does work.

Here I changed the code to 302 and returned a dict:

endpoint's code for reference

def doGet(request, session):
	tag_paths = [
		"[System]Gateway/Redundancy/IsMaster",
		"[System]Gateway/Redundancy/IsActive"
	]
	is_master, is_active = [qv.value for qv in system.tag.readBlocking(tag_paths)]
	
	if not is_active:
		request['servletResponse'].status = 302
	
	return {
		'json': {
			'is_master': is_master,
			'ip_addr': system.net.getIpAddress(),
			'hostname': system.net.getHostName()
		}
	}