以下是cowin公共api的链接：
https://apisetu.gov.in/public/marketplace/api/cowin#/
https://cdn-api.co-vin.in/api/v2/admin/location/states
我一直在尝试使用改型库从android studio的第二个链接获取状态详细信息。但每次我运行应用程序时，它都会显示错误403。任何帮助都将不胜感激！！在下面添加我的代码：
关于创建活动：

Retrofit retrofit = new Retrofit.Builder().baseUrl("https://cdn-api.co-vin.in/api/").addConverterFactory(GsonConverterFactory.create()).build();

        CovidAPI covidAPI = retrofit.create(CovidAPI.class);

        Call<StateMainModel> call = covidAPI.getAllIndiaStates();

        call.enqueue(new Callback<StateMainModel>() {
            @Override
            public void onResponse(Call<StateMainModel> call, Response<StateMainModel> response) {
                if(!response.isSuccessful())
                {
                    Toast.makeText(getApplicationContext(),"Error!!Code: "+response.code()+response.toString(),Toast.LENGTH_SHORT).show();
                    tv.setText(response.toString());
                    return;
                }
                else
                {
                    StateMainModel stateMainModel = response.body();

                    int size = stateMainModel.getStates().size();

                    for(int i=0;i<size;i++)
                    {
                        stateList.add(stateMainModel.getStates().get(i).getState_name());
                    }

                    stateAutoCompleteTextView.setAdapter(stateAdapter);
                }

            }

            @Override
            public void onFailure(Call<StateMainModel> call, Throwable t) {
                Toast.makeText(getApplicationContext(),"Error!! Response: "+t.getMessage(),Toast.LENGTH_LONG).show();
            }
        });

api接口

@GET("v2/admin/location/states")
    Call<StateMainModel> getAllIndiaStates();

StateMain模型类

private ArrayList<StateIdNameModel> states;
    private Integer ttl;

    public StateMainModel() {
    }

    public StateMainModel(ArrayList<StateIdNameModel> states,Integer ttl) {
        this.states = states;
        this.ttl = ttl;
    }

    public ArrayList<StateIdNameModel> getStates() {
        return states;
    }

    public void setStates(ArrayList<StateIdNameModel> states) {
        this.states = states;
    }

    public Integer getTtl() {
        return ttl;
    }

    public void setTtl(Integer ttl) {
        this.ttl = ttl;
    }