I'd like to create a cookie when the client makes a specific request. If I understand correctly, that means I need to add a

Set-Cookie

header in the response. However,

call.respond

doesn't take a lambda to configure the request, unlike its client-side equivalent. I found

call.respondText

, which has an override with a lambda with an

OutgoingContent

receiver, which has a

headers

attribute, however it seems to be immutable. How can I add a specific header for a specific request? I don't want that header to be present in other requests.

You can use

ResponseCookies

object to append cookies for a response:

routing {
    get("/") {
        call.response.cookies.append("name1", "value")
        call.response.cookies.append("name2", "value")
        call.respond(HttpStatusCode.OK)
    }
}

Oh, that's nice! And it also answers the next question I had because that also works the other way around with

call.request

.

hi, you can find how to specify various response parameters (including cookies) in the

Set response parameters

section: https://ktor.io/docs/responses.html#cookies

Ah, indeed. It doesn't appear in the table of contents nor in Google results so I couldn't find it.