i’m trying a simple echo handler basically that just returns the request it received as JSON in the ...

# http4k

[Nezteb]

i’m trying a simple echo handler basically that just returns the request it received as JSON in the body. I assume I need .body, not .with, but how can I convert the request to JSON? I could use a Jackson mapper manually, but I assume HTTP4k has a built-in way to do it

fun getRequestAsJson(): HttpHandler {
    return {
        Response(OK).body(it)
    }
}

[s4nchez]

What do you mean by "covert the request to JSON"? Can you provide an example on how you'd like the response to look like?

[Nezteb]

The method, uri, all the headers, all the query params, etc. Which are encapsulated in the object.

In javalin for example, you can just do jacksonMapper.readValue(request) and put it in the response body

[Nezteb]

Sweet, so I got that working, but the response header is always Content-Type →application/octet-stream

[Nezteb]

1. i assume it should default to JSON, since i’m not setting that anywhere
2. how can I change it? Via filter? Filters can operate on requests, but maybe not responses?

[s4nchez]

If you just want to print the request in the response, you can do Response(OK).body(request.toString()). The string versions of request and response are similar to what is sent over the wire

[s4nchez]

To set the response content-type you can either do Response(OK).header("content-type", "application/json") or, using Lens via Response(OK).with(Header.CONTENT_TYPE of ContentType.APPLICATION_JSON

[Nezteb]

fun health(): HttpHandler {
    return {
        Response(OK).body("I'm healthy!")
    }
}

the header here defaults to octet-stream every time.

[Nezteb]

if i manually set the header it’s fine, but octet-stream seems like an odd default

[Nezteb]

ooo good call with the .with(Header... bit, thanks~

[s4nchez]

The octet-stream is not our default. It's probably the backend you're using or what the browser or client assumes if the server sends none.

[Nezteb]

hmmmm, i’ll investigate. i’m using KtorCIO