Why Coroutine concurrency post body error I have two api using Coroutine and retorfit @POST("/api1") fun api1(@Body requestBody: Request1) @POST("/api2") fun api2(@Body requestBody: Request2) how I call fun callApi1() { GlobalScope.launch { Apiservice.api1() ... } } fun callApi2() { GlobalScope.launch { Apiservice.api2() ... } } they both work and get correct response I want but when I call them at the same time every 5 seconds fun getApi() { GlobalScope.launch {...