In the ktor app, I'm trying to read posted parameters like this :
val params = call.receiveParameters()
But I'm facing this error :
No Default Transformations found for class io.ktor.utils.io.ByteBufferChannel and expected type TypeInfo(type=class io.ktor.http.Parameters, reifiedType=interface io.ktor.http.Parameters, kotlinType=io.ktor.http.Parameters) for call /...
io.ktor.server.plugins.BadRequestException: Failed to convert request body to class io.ktor.http.Parameters
I'm using ktor 3.0.0-beta-1, also I installed the Content Negotiation like this :
install(ContentNegotiation) {
gson {}
json(Json {
prettyPrint = true
isLenient = true
ignoreUnknownKeys = true
})
}
And I'm sending POST request to the app like this (using Axios):
axios.post(
`http://127.0.0.1:8080/api/...`,
{
a:"1",
b:"2"
},{})
Since I'm sending simple pairs of string keys and values, temporarily I'm using the below solution, and It works :
val paramsMap = call.receive<Map<String,String>>()
What is the correct way to solve this problem !?
receiveParameters is for reading form data - application/x-www-form-urlencoded or multipart/form-data. I'm not that familiar with axios, but the request you sent seems to just be application/json.
An example of a HTTP request that can be received using receiveParameters can be found here.
POST http://localhost:8080/signup Content-Type: application/x-www-form-urlencoded username=JetBrains&email=example@jetbrains.com&password=foobar&confirmation=foobar
To see how to send a x-www-form-urlencoded with axios, see this post.
If you just want to send JSON, using receive is the correct approach. If the keys are not dynamic, also consider writing @Serializable data class for this request, instead of deserialising it to Map.