I'm facing a 404 Not Found error when trying to register a user in my Ktor application

Question

When sending a POST request to register a user using Postman, a 404 Not Found error is encountered. The Ktor server logs indicate a failure in resolving routes with the message: "No matched subtrees found."

Trace Output:

TRACE io.ktor.routing.Routing - Trace for [v1, users, register]
/, segment:0 -> SUCCESS @ /
  /, segment:0 -> SUCCESS @ /
    /(method:GET), segment:0 -> FAILURE "Selector didn't match" @ /(method:GET)
  /(method:POST), segment:0 -> FAILURE "Not all segments matched" @ /(method:POST)
Matched routes:
  No results
Route resolve result:
  FAILURE "No matched subtrees found" @ /
TRACE i.k.s.p.c.ContentNegotiation - Skipping response body transformation from HttpStatusCode to OutgoingContent for the POST /v1/users/register request because the HttpStatusCode type is ignored. See [ContentNegotiationConfig::ignoreType].

Additional Information: Endpoint Structure:

The project involves user authentication and note-related functionality. Endpoints include registration (/v1/users/register) and note operations (/v1/notes/create, /v1/notes/update, /v1/notes/delete). Routing Setup:

Routes are configured using the Ktor routing mechanism in multiple files (UserRoutes.kt, NoteRoutes.kt). The routes include authentication using JWT. Content Negotiation Issue:

The trace indicates a content negotiation issue: "Skipping response body transformation from HttpStatusCode to OutgoingContent." Potential Causes:

Mismatch in Accept headers in the request. Content type configuration in the application might be affecting negotiation. Ignoring HttpStatusCode type in content negotiation.

UserRoutes.kt:

package com.example.routes
import com.example.authentication.Jwt_Service
import com.example.data.model.LoginRequest
import com.example.data.model.RegistrationRequest
import com.example.data.model.SimpleResponse
import com.example.data.model.Userdata
import com.example.repository.repo
import io.ktor.http.*
import io.ktor.resources.*
import io.ktor.server.application.*
import io.ktor.server.request.*
import io.ktor.server.response.*
import io.ktor.server.routing.*
const val API_VERSION = "v1"
const val USERS = "$API_VERSION/users"
const val REGISTER = "$USERS/register"
const val LOGIN = "$USERS/login"

@Resource(REGISTER)
class Registration

@Resource(LOGIN)
class Login

fun Route.UserRoutes(db: repo, jwtService: Jwt_Service, hash: (String) -> String){
    post<Registration> {
        val register_request = try {
            call.receive<RegistrationRequest>()
        }catch (e:Exception){
            call.respond(HttpStatusCode.BadRequest, SimpleResponse(false,"Missing some fields"))
            return@post
        }
        try {
            val user = Userdata(register_request.email,register_request.name,register_request.password)
            db.addUser(user)
            call.respond(HttpStatusCode.OK,SimpleResponse(success = true,jwtService.generateToken(user)))
        }catch (e:Exception){
            call.respond(HttpStatusCode.Conflict,SimpleResponse(success = false,"Some error occured!"))
        }
    }

//similar method for login

The project have a similar file for defining NoteRoutes as well where the concept of Authentication is also implemented

Authentication:

fun Application.configureAuthentication(){
log.info("Authentication started")
val jwtService = Jwt_Service()
val db = repo()
install(Authentication){
    jwt("jwt"){
        verifier(jwtService.verifier)
        realm = "Notify Server"
        validate {
            val payload = it.payload
            val email = payload.getClaim("email").asString()
            val user = db.findUser(email)
            user
        }
    }
}

Data class for User is defined as:

@Serializable
data class Userdata(
    val email: String,
    val name: String,
    val hashpassword: String
):Principal

cURL version of postman request:

curl --location 'localhost:8080/v1/users/register' \
--header 'Content-Type: application/json' \
--data-raw '{
    "email":"ayushkt@gmail.com",
    "name":"ayush",
    "password":"bvdsjc"
}'