Unauthorized error while trying to intercept Retrofit request

Question

I am using Retrofit below 2.0 in order to make API call. The endpoint is " http://api.themoviedb.org/3 ". The method is

@GET("/discover/movie")
void getMovies(Callback<MoviesResponse> callback);

They want me to add api_key as parameter. You can see the instructions here .

I am creating interceptor and setting it while building the client. This is the overridden method of the interceptor.

@Override
public void intercept(RequestFacade request) {
    request.addHeader("api_key", MY_API_KEY);
}

For some reason I get Unauthorized error. "Invalid API key: You must be granted a valid key."

The example they are giving is:

http://api.themoviedb.org/3/movie/550?api_key=###

Answer 1

I found what was wrong. I was adding a header while they were asking for parameter.

@Override
public void intercept(RequestFacade request) {
    request.addQueryParam(HEADER_NAME, mApiKey);
}