Question: if the client has a made a request that ...

# ktor

[Laxystem]

Question: if the client has a made a request that was redirected, can I get the server's redirection response?

[Laxystem]

Use case, am trying to get the the URL of the last request made (i.e. after all redirects) excluding 303 redirects.

[Laxystem]

Basically, trying to get example.com/bar where:
1. example.com/foo redirects to example.com/bar
2. example.com/bar redirects to exmaple.com/foobar with a 303
3. example.com/foobar redirects to example.net/foo

[Bruce Hamilton]

Yes, something like this should be possible with the HttpRedirect plugin

client.monitor.subscribe(HttpResponseRedirectEvent) { response ->
   println(response.status)
}

[Laxystem]

Wait, http redirects are a plugin?

[Laxystem]

oh wait yeah ic

[Laxystem]

@Bruce Hamilton but how can I pass this info to the rest of my code?

[Laxystem]

Are the redirecting response's call.attributes copied to the request?

[Bruce Hamilton]

I don't think so, it would likely just be a set of the attributes of the original request that are copied, though I'm not very familiar with the code there

[Laxystem]

@Bruce Hamilton so response.call.request.attributes should work?

[Bruce Hamilton]

it should 🤞 😄

[Aleksei Tirman [JB]]

Please note that the HttpResponseRedirectEvent is available only in Ktor 3.. To solve the problem for Ktor 2., you can write a plugin that would add a handler for the Send hook to save the latest redirected location in the request attributes. Here is an example:

val redirectKey = AttributeKey<String>("redirectKey")
val plugin = createClientPlugin("my plugin") {
    on(Send) { request ->
        val call = proceed(request)
        if (listOf(301, 302, 307, 308).contains(call.response.status.value)) {
            call.response.headers[HttpHeaders.Location]?.let { location ->
                request.attributes.put(redirectKey, location)
            }
        }
        call
    }
}

val client = HttpClient(CIO) {
    install(plugin)
}

val response = client.get("<https://httpbin.org/status/302>")
println(response.request.attributes[redirectKey])

[Laxystem]

@Aleksei Tirman [JB] I'm currently doing this:

client.monitor.subscribe(HttpRedirect.HttpResponseRedirect) {
        if (it.status == HttpStatusCode.SeeOther && FirstSeeOtherRedirectLocation !in it.call.attributes) {
            it.call.attributes.put(FirstSeeOtherRedirectLocation, it.request.url)
        }
    }

[Laxystem]

Ktor 2.3.9

[Sajal Kumar Jana]

override suspend fun getNoteById(noteId: Long): NoteRow? {
    return dbQuery {
        NotesTable
            .join(
                otherTable = UserTable,
                onColumn = NotesTable.userId,
                otherColumn = UserTable.userId,
                joinType = JoinType.INNER
            )
            .select { NotesTable.noteId eq noteId }
            .singleOrNull()
            ?.let { toNoteRow(it) }
    }
}override suspend fun getUserNotes(userId: Long): Response<NoteResponse> {
        val listOfNotes = notesDao.getUserNotes(userId)
        return if (listOfNotes.isEmpty()) {
            Response.Error(
                code = HttpStatusCode.InternalServerError,
                data = NoteResponse(
                    success = false,
                    message = "No notes available, click to add notes"
                )
            )
        } else {
            Response.Success(
                data = NoteResponse(
                    success = true,
                    notes = listOfNotes.map { toNote(it) },
                    message = "Notes fetched successfully"
                )
            )
        }

    }        route("/notes"){
            delete(path = "/{noteId}") {
                try {
                    val noteId = call.getLongParameter(name = "noteId")
                    val result = repository.deleteNote(noteId = noteId)
                    call.respond(
                        status = result.code,
                        message = result.data
                    )
                } catch (badRequestError: BadRequestException) {
                    return@delete
                } catch (anyError: Throwable) {
                    call.respond(
                        status = HttpStatusCode.InternalServerError,
                        message = NoteResponse(
                            success = false,
                            message = "An unexpected error has occurred, try again!"
                        )
                    )
                }
            }
            get("/{userId}") {
                try {
                    val userId = call.parameters["userId"]!!.toLong()
                    val response = repository.getUserNotes(userId)

                    call.respond(response)
                } catch (badRequestError: BadRequestException) {
                    return@get
                } catch (anyError: Throwable) {
                    call.respond(
                        status = HttpStatusCode.InternalServerError,
                        message = NoteResponse(
                            success = false,
                            message = "An unexpected error has occurred, try again!"
                        )
                    )
                }
            }
        } please help me fix the issue i am getting the any error throwabele for the get response i have two tables a usertable and a notes table linked by userId i want to fetch all the notes created by a user

[Aleksei Tirman [JB]]

@Sajal Kumar Jana, you'd better ask this question in the #exposed channel.