Caused by: retrofit.RetrofitError: method POST must have a request body

Question

I am using retrofit to make a post api call, I am getting the following error while trying to hit the endpoint.

     Caused by: rx.exceptions.OnErrorNotImple         


        

Answer 1

downgrade OkHttp to version 2.3.0

Answer 2

@Body String emptyBody wasn't working for me as backend server I was working with, was returning Bad request and not accepting empty string as a body.

I've just sent empty JSON instead of empty String

@POST("/some/url) Observable<Thing> doThing(@Body JsonElement empty);

and then I just called my method like this:

doThing(new JsonObject());

Hope it will help if someone has similar problem.

Answer 3

It looks like Retrofit wants POST requests to have a payload. There's already an issue for it: https://github.com/square/retrofit/issues/854

As a workaround, you could do something like this:

@POST("/service/v2/auth/ip-address")
rx.Observable<AuthState> verifyIP(@Body Object dummy);

and then do:

LoginService service = CKRestClient.get().create(LoginService.class);

service.verifyIP(null).observeOn(AndroidSchedulers.mainThread()).subscribe(
  new Action1<AuthState>() {
    @Override
    public void call(AuthState authState) {
      // ...
    }
  });
});

Or, if service.verifyIP(null) throws a NPE, replace it with service.verifyIP("") or similar.

Answer 4

It seems that Retrofit rel.1.9 is prone by the issue (https://github.com/square/retrofit/issues/854).

In the meantime, consider downgrading to rel.1.6 until current release will be fixed. It is verified that rel.1.6 is free of this particular bug.

Answer 5

just include in @Post Method

@Body String dummyValue , if body not required you must write this query and send "" to server

Answer 6

I solved this issue by replacing @Query to @Field, here is how:

Not working code:

@POST("/my/url/path")
Result postToServer(
        @Query("user_name") String userName);

Working example:

@FormUrlEncoded
@POST("/my/url/path")
Result postToServer(
        @Field("user_name") String userName);

For methods that do not have any fields I had to add empty string like below

Result postToServer(@Path("my_path") String myPath,
                               @Body String emptyString);

And call it passing "":

restClient.postToServer(myPath, "");