HTTP 错误 400。请求主机名无效 - 改造

Posted 2023-03-31

【中文标题】HTTP 错误 400。请求主机名无效 - 改造

【英文标题】：HTTP Error 400. The request hostname is invalid - Retrofit

【发布时间】：2020-04-09 04:23:54

【问题描述】：

我正在 Visual Studio 2019 中运行一个 Web API 项目。它在我机器上的 localhost 上运行良好。当我发出 GET /POST 请求时，请求返回“400 bad requests invalid hostname”。

这是我的 Web API

    [AllowAnonymous]
    [HttpGet("forTest")]
    public async Task<IActionResult> ForTest()
    
        return Ok(true);
    

我可以在邮递员中访问服务器，调用https://localhost:44317/api/users/forTest。

---

这是我的 android studio 设置，

API客户端

public class APIClient 
    public static final String BASE_URL = "https://10.0.2.2:44317/api/";
    private static Retrofit retrofit = null;
    private static OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
    public static Retrofit getClient() 
        if (retrofit == null) 
        //Defining the Retrofit using Builder
        retrofit = new Retrofit.Builder()
            .baseUrl(BASE_URL) //This is the only mandatory call on Builder object.
            .addConverterFactory(GsonConverterFactory.create())
            .client(getUnsafeOkHttpClient().build())
            .build();
        
        return retrofit;
    

    public static OkHttpClient.Builder getUnsafeOkHttpClient() 
        try 
            // Create a trust manager that does not validate certificate chains
            final TrustManager[] trustAllCerts = new TrustManager[]
                    new X509TrustManager() 
                        @Override
                        public void checkClientTrusted(java.security.cert.X509Certificate[] 
                          chain, String authType) throws CertificateException 
                        

                        @Override
                        public void checkServerTrusted(java.security.cert.X509Certificate[] 
                           chain, String authType) throws CertificateException 
                        

                        @Override
                        public java.security.cert.X509Certificate[] getAcceptedIssuers() 
                            return new java.security.cert.X509Certificate[];
                        
                    
            ;

                // Install the all-trusting trust manager
                final SSLContext sslContext = SSLContext.getInstance("SSL");
                sslContext.init(null, trustAllCerts, new java.security.SecureRandom());

                // Create an ssl socket factory with our all-trusting manager
                final SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();

                OkHttpClient.Builder builder = new OkHttpClient.Builder();
                builder.sslSocketFactory(sslSocketFactory, (X509TrustManager) trustAllCerts[0]);
                builder.hostnameVerifier(new HostnameVerifier() 
                    @Override
                    public boolean verify(String hostname, SSLSession session) 
                        return true;
                    
                );
                return builder;
              catch (Exception e) 
                throw new RuntimeException(e);
             
        

ApiService

public interface ApiService 

    @POST("users/authenticate")
    Call<List<AuthData>> doLogin(@Body AuthBody authBody);

    @GET("users/forTest")
    Call<Boolean> ApiTest();

主活动

Retrofit retrofit = APIClient.getClient();
ApiService apiService = retrofit.create(ApiService.class);

Call<Boolean> call = apiService.ApiTest();

call.enqueue(new Callback<Boolean>() 
            @Override
            public void onResponse(Call<Boolean> call, Response<Boolean> response) 
                if(response.code() == 400)
                    try 
                        Log.i("TAG", response.errorBody().string());
                     catch (IOException e) 
                        e.printStackTrace();
                    
                
                Log.i("TAG", "ok");
            

            @Override
            public void onFailure(Call<Boolean> call, Throwable t) 
                Log.i("TAG", t.getLocalizedMessage());
            
        );

响应为，

HTTP 错误 400。请求主机名无效。

有什么解决办法吗？

【问题讨论】：

blog.lextudio.com/…

天哪。这就是解决方案。谢谢@LexLi

【参考方案1】：

根据@LexLi 的评论，我调查了问题并找出了解决方案。

原创文章-https://blog.lextudio.com/how-to-let-android-emulator-access-iis-express-f6530a02b1d3