如果路径参数无效，则在Ktor-locations中捕获异常

import io.ktor.locations.*
import io.ktor.application.*
import io.ktor.features.ContentNegotiation
import io.ktor.http.HttpStatusCode
import io.ktor.http.HttpStatusCode.Companion.BadRequest
import io.ktor.jackson.jackson
import io.ktor.response.respond
import io.ktor.routing.Routing
import io.ktor.routing.get
import io.ktor.routing.routing

@Location("/users/{userId}")
data class UserLocation(val userId: Int)

fun Application.module() {
    install(ContentNegotiation) {
        jackson {}
    }

    routing {
        get<UserLocation> { userLocation ->
            try {
                // 根据用户ID执行相应的操作
                val userId = userLocation.userId
                // 其他逻辑...
                call.respond(HttpStatusCode.OK, "处理路径参数成功")
            } catch (e: Exception) {
                call.respond(BadRequest, "路径参数无效")
            }
        }
    }
}