Add Header Parameter in Retrofit
Try this type header for Retrofit 1.9 and 2.0. For the JSON content type.
@Headers({"Accept: application/json"})
@POST("user/classes")
Call<playlist> addToPlaylist(@Body PlaylistParm parm);
You can add many more headers, i.e,
@Headers({
"Accept: application/json",
"User-Agent: Your-App-Name",
"Cache-Control: max-age=640000"
})
Dynamically add to headers:
@POST("user/classes")
Call<ResponseModel> addToPlaylist(@Header("Content-Type") String content_type, @Body RequestModel req);
Call your method, i.e.,
mAPI.addToPlayList("application/json", playListParam);
Or
Want to pass every time, then create an HttpClient object with the HTTP Interceptor:
OkHttpClient httpClient = new OkHttpClient();
httpClient.networkInterceptors().add(new Interceptor() {
@Override
public com.squareup.okhttp.Response intercept(Chain chain) throws IOException {
Request.Builder requestBuilder = chain.request().newBuilder();
requestBuilder.header("Content-Type", "application/json");
return chain.proceed(requestBuilder.build());
}
});
Then add to a Retrofit object
Retrofit retrofit = new Retrofit.Builder().baseUrl(BASE_URL).client(httpClient).build();
If you are using Kotlin, remove the { }
. Else it will not work.
You can use the below
@Headers("user-key: 9900a9720d31dfd5fdb4352700c")
@GET("api/v2.1/search")
Call<String> getRestaurantsBySearch(@Query("entity_id") String entity_id, @Query("entity_type") String entity_type, @Query("q") String query);
and
Call<String> call = endpoint.getRestaurantsBySearch("3","city","cafes");
The above is based in the zomato api which is documented at
https://developers.zomato.com/documentation#!/restaurant/search
Thing to note is the end point change api/v2.1/search and the Header @Headers("user-key: 9900a9720d31dfd5fdb4352700c")
.
Also check your base url .baseUrl("https://developers.zomato.com/")
Also i tried the above with a api key i generated and it works and my query was cafes as suggested the zomato documentation.
Note : I hope you have the below
.addConverterFactory(ScalarsConverterFactory.create()) // for string conversion
.build();
and the below in build.gradle file
compile group: 'com.squareup.retrofit2', name: 'converter-scalars', version: '2.2.0'
Edit:
You can also pass header with dynamic value as below
@GET("api/v2.1/search")
Call<String> getRestaurantsBySearch(@Query("entity_id") String entity_id, @Query("entity_type") String entity_type, @Query("q") String query,@Header("user-key") String userkey);
And
Call<String> call = endpoint.getRestaurantsBySearch("3","city","cafes","9900a9720d31dfd5fdb4352700c");
After trying a couple of times i figured out the answer.
The error
java.lang.IllegalStateException: Expected a string but was BEGIN_OBJECT at line 1 column 2 path $
was coming due the failure of parsing the json.
In the method call I was passing a String instead of a POJO class.
@Headers("user-key: 9900a9720d31dfd5fdb4352700c")
@GET("api/v2.1/search")
Call<String> getRestaurantsBySearch(@Query("entity_id") String entity_id, @Query("entity_type") String entity_type, @Query("q") String query);
I should have passed instead of Call<String> the type of Call<Data>
Data being the Pojo class
something like this
@Headers("user-key: 9900a9720d31dfd5fdb4352700c")
@GET("api/v2.1/search")
Call<Data> getRestaurantsBySearch(@Query("entity_id") String entity_id, @Query("entity_type") String entity_type, @Query("q") String query);