使用 Retrofit 2 向所有请求添加标头

Question

Retrofit 2 的文档说：

可以使用 OkHttp 拦截器指定需要添加到每个请求的标头。

使用以前的版本可以轻松完成， 这是相关的 QA。

但是使用改造 2，我找不到可以应用于Retrofit.Builder对象的setRequestInterceptor或setInterceptor方法。

似乎OkHttp 中不再有RequestInterceptor了。 Retrofit 的文档向我们介绍了Interceptor ，我不太明白如何为此目的使用它。

我怎样才能做到这一点？

Answer 1

OkHttpClient.Builder httpClient = new OkHttpClient.Builder();

httpClient.addInterceptor(new Interceptor() {
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request().newBuilder().addHeader("parameter", "value").build();
        return chain.proceed(request);
    }
});
Retrofit retrofit = new Retrofit.Builder().addConverterFactory(GsonConverterFactory.create()).baseUrl(url).client(httpClient.build()).build();

Answer 2

最新的改造版本在这里 -> 2.1.0。

拉姆达版本：

  builder.addInterceptor(chain -> {
    Request request = chain.request().newBuilder().addHeader("key", "value").build();
    return chain.proceed(request);
  });

丑陋的长版：

  builder.addInterceptor(new Interceptor() {
    @Override public Response intercept(Chain chain) throws IOException {
      Request request = chain.request().newBuilder().addHeader("key", "value").build();
      return chain.proceed(request);
    }
  });

完整版本：

class Factory {

public static APIService create(Context context) {

  OkHttpClient.Builder builder = new OkHttpClient().newBuilder();
  builder.readTimeout(10, TimeUnit.SECONDS);
  builder.connectTimeout(5, TimeUnit.SECONDS);

  if (BuildConfig.DEBUG) {
    HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
    interceptor.setLevel(HttpLoggingInterceptor.Level.BASIC);
    builder.addInterceptor(interceptor);
  }

  builder.addInterceptor(chain -> {
    Request request = chain.request().newBuilder().addHeader("key", "value").build();
    return chain.proceed(request);
  });

  builder.addInterceptor(new UnauthorisedInterceptor(context));
  OkHttpClient client = builder.build();

  Retrofit retrofit =
      new Retrofit.Builder().baseUrl(APIService.ENDPOINT).client(client).addConverterFactory(GsonConverterFactory.create()).addCallAdapterFactory(RxJavaCallAdapterFactory.create()).build();

  return retrofit.create(APIService.class);
  }
}

gradle 文件（如果你打算使用它，你需要添加日志拦截器）：

  //----- Retrofit
  compile 'com.squareup.retrofit2:retrofit:2.1.0'
  compile "com.squareup.retrofit2:converter-gson:2.1.0"
  compile "com.squareup.retrofit2:adapter-rxjava:2.1.0"
  compile 'com.squareup.okhttp3:logging-interceptor:3.4.0'

Answer 3

在 Retrofit 1.9 和 2.0 中尝试使用这种类型的标头。 对于 Json 内容类型。

@Headers({"Accept: application/json"})
@POST("user/classes")
Call<playlist> addToPlaylist(@Body PlaylistParm parm);

您可以添加更多标题，即

@Headers({
        "Accept: application/json",
        "User-Agent: Your-App-Name",
        "Cache-Control: max-age=640000"
    })

动态添加到标题：

@POST("user/classes")
Call<ResponseModel> addToPlaylist(@Header("Content-Type") String content_type, @Body RequestModel req);

打电话给你的方法即

mAPI.addToPlayList("application/json", playListParam);

或者

想要每次都通过，然后使用 http 拦截器创建 HttpClient 对象：

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());
            }
        });

然后添加到改造对象

Retrofit retrofit = new Retrofit.Builder().baseUrl(BASE_URL).client(httpClient).build();

UPDATE如果您使用 Kotlin 删除{ }否则它将不起作用

Answer 4

为了记录您的请求和响应，您需要一个拦截器，并且还需要一个拦截器来设置标头，这是使用改造 2.1 同时添加两个拦截器的解决方案

 public OkHttpClient getHeader(final String authorizationValue ) {
        HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        OkHttpClient okClient = new OkHttpClient.Builder()
                .addInterceptor(interceptor)
                .addNetworkInterceptor(
                        new Interceptor() {
                            @Override
                            public Response intercept(Interceptor.Chain chain) throws IOException {
                                Request request = null;
                                if (authorizationValue != null) {
                                    Log.d("--Authorization-- ", authorizationValue);

                                    Request original = chain.request();
                                    // Request customization: add request headers
                                    Request.Builder requestBuilder = original.newBuilder()
                                            .addHeader("Authorization", authorizationValue);

                                    request = requestBuilder.build();
                                }
                                return chain.proceed(request);
                            }
                        })
                .build();
        return okClient;

    }

现在在您的改造对象中，在客户端中添加此标头

Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(url)
                .client(getHeader(authorizationValue))
                .addConverterFactory(GsonConverterFactory.create())
                .build();

Answer 5

在我的情况下， addInterceptor()无法将 HTTP 标头添加到我的请求中，我不得不使用addNetworkInterceptor() 。 代码如下：

OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
httpClient.addNetworkInterceptor(new AddHeaderInterceptor());

和拦截器代码：

public class AddHeaderInterceptor implements Interceptor {
    @Override
    public Response intercept(Chain chain) throws IOException {

        Request.Builder builder = chain.request().newBuilder();
        builder.addHeader("Authorization", "MyauthHeaderContent");

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

这个和更多关于这个要点的例子

Answer 6

如果您使用 addInterceptor 方法添加 HttpLoggingInterceptor，它将不会记录由晚于 HttpLoggingInterceptor 应用的其他拦截器添加的内容。

例如：如果您有两个拦截器“HttpLoggingInterceptor”和“AuthInterceptor”，并且首先应用了HttpLoggingInterceptor，那么您将无法查看AuthInterceptor 设置的http-params 或headers。

OkHttpClient.Builder builder = new OkHttpClient.Builder()
.addNetworkInterceptor(logging)
.addInterceptor(new AuthInterceptor());

我通过使用 addNetworkInterceptor 方法解决了它。

Answer 7

在 kotlin 中添加拦截器看起来像这样：

.addInterceptor{ it.proceed(it.request().newBuilder().addHeader("Cache-Control", "no-store").build())}

Answer 8

使用这个改造客户端

class RetrofitClient2(context: Context) : OkHttpClient() {

    private var mContext:Context = context
    private var retrofit: Retrofit? = null

    val client: Retrofit?
        get() {
            val logging = HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY)

            val client = OkHttpClient.Builder()
                    .connectTimeout(Constants.TIME_OUT, TimeUnit.SECONDS)
                    .readTimeout(Constants.TIME_OUT, TimeUnit.SECONDS)
                    .writeTimeout(Constants.TIME_OUT, TimeUnit.SECONDS)
            client.addInterceptor(logging)
            client.interceptors().add(AddCookiesInterceptor(mContext))

            val gson = GsonBuilder().setDateFormat("yyyy-MM-dd'T'HH:mm:ssZ").create()
            if (retrofit == null) {

                retrofit = Retrofit.Builder()
                        .baseUrl(Constants.URL)
                        .addConverterFactory(GsonConverterFactory.create(gson))
                        .client(client.build())
                        .build()
            }
            return retrofit
        }
}

---

我将 JWT 与每个请求一起传递。 请不要介意变量名称，这有点令人困惑。

class AddCookiesInterceptor(context: Context) : Interceptor {
    val mContext: Context = context
    @Throws(IOException::class)
    override fun intercept(chain: Interceptor.Chain): Response {
        val builder = chain.request().newBuilder()
        val preferences = CookieStore().getCookies(mContext)
        if (preferences != null) {
            for (cookie in preferences!!) {
                builder.addHeader("Authorization", cookie)
            }
        }
        return chain.proceed(builder.build())
    }
}

Answer 9

用 kotlin 编写的RetrofitHelper库，可以让您使用几行代码进行 API 调用。

在您的应用程序类中添加标题，如下所示：

class Application : Application() {

    override fun onCreate() {
    super.onCreate()

        retrofitClient = RetrofitClient.instance
                    //api url
                .setBaseUrl("https://reqres.in/")
                    //you can set multiple urls
        //                .setUrl("example","http://ngrok.io/api/")
                    //set timeouts
                .setConnectionTimeout(4)
                .setReadingTimeout(15)
                    //enable cache
                .enableCaching(this)
                    //add Headers
                .addHeader("Content-Type", "application/json")
                .addHeader("client", "android")
                .addHeader("language", Locale.getDefault().language)
                .addHeader("os", android.os.Build.VERSION.RELEASE)
            }

        companion object {
        lateinit var retrofitClient: RetrofitClient

        }
    }  

然后拨打您的电话：

retrofitClient.Get<GetResponseModel>()
            //set path
            .setPath("api/users/2")
            //set url params Key-Value or HashMap
            .setUrlParams("KEY","Value")
            // you can add header here
            .addHeaders("key","value")
            .setResponseHandler(GetResponseModel::class.java,
                object : ResponseHandler<GetResponseModel>() {
                    override fun onSuccess(response: Response<GetResponseModel>) {
                        super.onSuccess(response)
                        //handle response
                    }
                }).run(this)

有关更多信息，请参阅文档

Answer 10

Kotlin 版本将是

fun getHeaderInterceptor():Interceptor{
    return object : Interceptor {
        @Throws(IOException::class)
        override fun intercept(chain: Interceptor.Chain): Response {
            val request =
            chain.request().newBuilder()
                    .header(Headers.KEY_AUTHORIZATION, "Bearer.....")
                    .build()
            return chain.proceed(request)
        }
    }
}


private fun createOkHttpClient(): OkHttpClient {
    return OkHttpClient.Builder()
            .apply {
                if(BuildConfig.DEBUG){
                    this.addInterceptor(HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BASIC))
                }
            }
            .addInterceptor(getHeaderInterceptor())
            .build()
}