Hey guys! I’m currently developing an API using Kt...

# ktor

[Sebastien Leclerc Lavallee]

Hey guys! I’m currently developing an API using Ktor and I need to inspect all incoming call for a specific header and return a HTTP 400 error if it’s not present. My understanding is that I could use an intercept for that purpose but I’m a bit confused where I should define and use it.
This is how my project is setup:

fun main(args: Array<String>): Unit = io.ktor.server.netty.EngineMain.main(args)

fun Application.module() {
  registerRoutes()
}

fun Application.registerRoutes() {
  routing {
    route("/") {
      get {
        call.respondText("Hello world!")
      }
    }
  }
}

What would be the best way? Where should I put it?
Thanks!

[Aleksei Tirman [JB]]

You can add an interceptor in the definition of the Application.module function. Here is an example:

fun Application.module() {
    intercept(ApplicationCallPipeline.Setup) {
        if (!call.request.headers.contains("my-header")) {
            call.respond(HttpStatusCode.BadRequest)
        }
    }
    // ...
}

[Sebastien Leclerc Lavallee]

Right on! Thanks a lot it worked like a charm 🙂