How to make a POST request using retrofit 2?

Question

I was only able to run the hello world example (GithubService) from the docs.

The problem is when I run my code, I get the following Error, inside of onFail

Answer 1

If you don't want JSON encoded params use this:

@FormUrlEncoded
@POST("/")
Call request(@Field("api_key") String apiKey, @Field("app_id") String appId);