How to add URL parameter in a Retrofit @GET request in Kotlin

Question

I am currently trying to fetch a JSONArray from a server using Retrofit in Kotlin. Here is the interface I am using:

interface TripsService {

    @GET("/coordsOfTrip{id}")
    fun getTripCoord(
            @Header("Authorization") token: String,
            @Query("id") id: Int
            ): Deferred<JSONArray>

    companion object{
        operator fun invoke(
            connectivityInterceptor: ConnectivityInterceptor
        ):TripsService{
            val okHttpClient = OkHttpClient.Builder().addInterceptor(connectivityInterceptor).build()
            return Retrofit.Builder()
                .client(okHttpClient)
                .baseUrl("https://someurl.com/")
                .addCallAdapterFactory(CoroutineCallAdapterFactory())
                .addConverterFactory(GsonConverterFactory.create())
                .build()
                .create(TripsService::class.java)
        }
    }
}

the desired url is: https://someurl.com/coordsOfTrip?id=201

I am getting the following error message:

retrofit2.HttpException: HTTP 405 Method Not Allowed

I know the URL is working because I can access it via a browser.

Can someone please help me identify what I am doing wrong?

Answer 1

Just change the parameter from

@GET("/coordsOfTrip{id}")

to

@GET("/coordsOfTrip")   // remove {id} part that's it

And you'd get the desired URL https://someurl.com/coordsOfTrip?id=201

If you want to use {id} in GET() then you've to use it like below

@GET("/coordsOfTrip{id}")
fun getTripCoord(
        @Header("Authorization") token: String,
        @Path("id") id: Int    // use @Path() instead of @Query()
): Deferred<JSONArray>

But in your case it doesn't require. Follow the first method I mentioned.

For more check Retorfit's official documentation URL Manipulation part

Answer 2

Replace

@GET("/coordsOfTrip{id}")

with:

@GET("/coordsOfTrip?id={id}")