Send empty body in POST request in Retrofit

Question

My api expects an empty json body ({ }) when making post requests. How do I set this up in Retrofit and Jackson?

I tried passing null, and empty string, and "{}" but could not get this to work.

@POST(my/url)
Call<MyResponse> createPostRequest(@Body Object empty);

How can I set an empty JSON body?

I guess you can create some empty class, e.g. `EmptyRequest` with singleton instance and pass it as parameter. — ledniov, Jun 15 '17 at 20:13

score 8 · Answer 1 · answered Jan 31 '20 at 09:32

8

An empty Object does it for Kotlin:

interface ApiService {
    @POST("your.url")
    fun createPostRequest(@Body body: Any = Object()): Call<YourResponseType>
}

answered Jan 31 '20 at 09:32

Frans Hanyane

237
2
12

score 6 · Answer 2 · answered Apr 14 '18 at 13:15

6

try this . It worked for me now.

@POST(my/url)
Call<MyResponse> createPostRequest(@Body Hashmap );

while using this method pass new HasMap as paremater

apiservice.createPostRequest(new HashMap())

answered Apr 14 '18 at 13:15

Gautam Kumar

1,385
14
17

score 4 · Accepted Answer · answered Jun 16 '17 at 11:49

Empty class will do the trick:

class EmptyRequest {
    public static final EmptyRequest INSTANCE = new EmptyRequest();
}

interface My Service {

    @POST("my/url")
    Call<MyResponse> createPostRequest(@Body EmptyRequest request);

}

myService.createPostRequest(EmptyRequest.INSTANCE);

score 3 · Answer 4 · answered Dec 31 '19 at 21:08

Old question, but I found a more suitable solution by using a okhttp3.Interceptor that adds an empty body if no body is present. This solution does not require you to add an extra parameter for an empty @Body.

Example:

Interceptor interceptor = chain -> {
    Request         oldRequest = chain.request();
    Request.Builder newRequest = chain.request().newBuilder();

    if ("POST".equals(oldRequest.method()) && (oldRequest.body() == null || oldRequest.body().contentLength() <= 0)) {
        newRequest.post(RequestBody.create(MediaType.parse("application/json"), "{}"));
    }

    return chain.proceed(newRequest.build());
};

You can then create an instance of your service like so:

OkHttpClient.Builder client = new OkHttpClient.Builder();
client.addInterceptor(interceptor);

Retrofit retrofit = new Retrofit.Builder()
        .baseUrl("YourURL")
        .client(client.build())
        .build();

MyService service = retrofit.create(MyService.class);

score 2 · Answer 5 · answered Jan 19 '20 at 15:09

2

use:

@POST("something")
Call<MyResponse> createPostRequest(@Body Object o);

then call:

createPostRequest(new Object())

answered Jan 19 '20 at 15:09

Mahdi Moqadasi

2,029
4
26
52

score 0 · Answer 6 · answered Feb 05 '22 at 22:24

0

Heres the answer in Kotlin:

    @POST("CountriesList")
fun getCountriesNew(@Body body: HashMap<String, String>) : Call<CountryModel>

      val call = RetrofitClient.apiInterface.getCountriesNew(HashMap())

answered Feb 05 '22 at 22:24

Osama Ibrahim

995
10
13

Send empty body in POST request in Retrofit

6 Answers6

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