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kotlinlang

With Ktor Server, is their any way to rewrite a header already written before?

```call.response.header("foo", "bar")
call.response.header("foo", "baz")```
This code returns a response with header `foo: bar` instead of `foo: baz`.

in HTTP headers can be set more than once - they can have multiple values.  Its likely your response has both “foo” headers in it (you’ll need to see the raw response via `curl -v` or somesuch, as lots of clients/libraries only pull out one of the headers).
Its not really possible to  “remove” a response header as it may already have been sent on the network.

I’m not sure about the network part, since the `append` method is not suspending. However, you’re right, the header is just probably sent multiple times.