Okhttp拦截器问题

Question

我正在尝试向简单的 okhttp (Get) 请求添加标头。如何正确添加 HttpHeader？我可以调试以确保我的 Header 实际发送到服务器吗？

        Request request = new Request.Builder()
                .url("URL")
                .build();

        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .addInterceptor(new Interceptor() {
                    @Override
                    public okhttp3.Response intercept(Chain chain) throws IOException {
                        Request originalRequest = chain.request();
                        Request newRequest = originalRequest.newBuilder()
                                .addHeader("Header", "123")
                                .build();
                        return chain.proceed(newRequest);
                    }
                })
                .build();

        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
             }

我一直在寻找基本的简单示例，但它们使用的是 Retrofit、GSON、Interfaces 或 Kotlin。需要以代码方式理解它。

Answer 1

您可以通过方法 addHeader 发送链作为参数并添加标题。

 Request getRequest = chain.request();
        Request.Builder requestBuilder = getRequest.newBuilder()
            .addHeader("Header", "123");
        Request request = requestBuilder.build();
        return chain.proceed(request);

您也可以访问并查看答案link1 和link2。

这是您可以使用的所有请求结构。

OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
        httpClient.addInterceptor(new Interceptor() {
            @Override
            public Response intercept(Interceptor.Chain chain) throws IOException {
                Request original = chain.request();

                Request request = original.newBuilder()
                        .method(original.method(), original.body())
                        .build();

                return chain.proceed(request);
            }
        };
        OkHttpClient client = httpClient.build();

        Request request = new Request.Builder()
                .url("URL")
                .addHeader("Header", "123")
                .build();

        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                e.printStackTrace();
                Log.d("OKHTTP3", e.getMessage());
                // You get this failure
                runOnUiThread(() -> {

                });
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                try {
                    final String _body = response.body().string();
                    Log.d("OKHTTP3", _body);
                    runOnUiThread(() -> {

                    });
                } catch (InterruptedIOException e) {
                    runOnUiThread(() -> {
                        // Or this exception depending when timeout is reached

                    });
                }
            }
        });

Answer 2

要检查您的请求并添加标头，您可以使用拦截器。

添加标题，（复制自gist）：

OkHttpClient.Builder httpClient = new OkHttpClient.Builder();  
httpClient.addInterceptor(new Interceptor() {  
    @Override
    public Response intercept(Interceptor.Chain chain) throws IOException {
        Request original = chain.request();

        Request request = original.newBuilder()
            .header("User-Agent", "Your-App-Name")
            .header("Accept", "application/vnd.yourapi.v1.full+json")
            .method(original.method(), original.body())
            .build();

        return chain.proceed(request);
    }
}

OkHttpClient client = httpClient.build();  
Retrofit retrofit = new Retrofit.Builder()  
    .baseUrl(API_BASE_URL)
    .addConverterFactory(GsonConverterFactory.create())
    .client(client)
    .build();

要查看您的标题，您可以使用here提供的示例示例：

class LoggingInterceptor implements Interceptor {
  @Override public Response intercept(Interceptor.Chain chain) throws IOException {
    Request request = chain.request();

    long t1 = System.nanoTime();
    logger.info(String.format("Sending request %s on %s%n%s",
        request.url(), chain.connection(), request.headers()));

    Response response = chain.proceed(request);

    long t2 = System.nanoTime();
    logger.info(String.format("Received response for %s in %.1fms%n%s",
        response.request().url(), (t2 - t1) / 1e6d, response.headers()));

    return response;
  }
}

Answer 3

使用addHeader() 添加标题。 header() 将已添加的标头名称设置为值。

Request newRequest = originalRequest.newBuilder()
    .addHeader("Header", "123")
    .build();

为了验证它是否正常工作，您可以使用HttpLoggingInterceptor 记录您的网络请求。