如何向OkHttp请求拦截器添加标头？

Question

我有这个拦截器,我添加到我的OkHttp客户端:

public class RequestTokenInterceptor implements Interceptor {
@Override
public Response intercept(Chain chain) throws IOException {
  Request request = chain.request();
  // Here where we'll try to refresh token.
  // with an retrofit call
  // After we succeed we'll proceed our request
  Response response = chain.proceed(request);
  return response;
}
}

如何在我的拦截器中添加标头以进行请求？

我尝试了这个,但我犯了错误,在创建新请求时我失去了我的请求:

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

        try {
            Log.d("addHeader", "Before");
            String token = TokenProvider.getInstance(mContext).getToken();
            newRequest = request.newBuilder()
                    .addHeader(HeadersContract.HEADER_AUTHONRIZATION, O_AUTH_AUTHENTICATION + token)
                    .addHeader(HeadersContract.HEADER_CLIENT_ID, CLIENT_ID)
                    .build();
        } catch (Exception e) {
            Log.d("addHeader", "Error");
            e.printStackTrace();
            return chain.proceed(request);
        }

        Log.d("addHeader", "after");
        return chain.proceed(newRequest);
    }
}

请注意,我知道我可以在创建请求时添加标头,如下所示:

Request request = new Request.Builder()
    .url("https://api.github.com/repos/square/okhttp/issues")
    .header("User-Agent", "OkHttp Headers.java")
    .addHeader("Accept", "application/json; q=0.5")
    .addHeader("Accept", "application/vnd.github.v3+json")
    .build();

但它不符合我的需要.我需要它在拦截器中.

Answer 1

最后,我以这种方式添加了标题:

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

        newRequest = request.newBuilder()
                .addHeader(HeadersContract.HEADER_AUTHONRIZATION, O_AUTH_AUTHENTICATION)
                .addHeader(HeadersContract.HEADER_X_CLIENT_ID, CLIENT_ID)
                .build();
        return chain.proceed(newRequest);
    }

Answer 2

你可以这样做

private String GET(String url, Map<String, String> header) throws IOException {
        Headers headerbuild = Headers.of(header);
        Request request = new Request.Builder().url(url).headers(headerbuild).
                        build();

        Response response = client.newCall(request).execute();
        return response.body().string();
    }

Answer 3

遇到与其他样本类似的问题，这个 Kotlin 类对我有用

import okhttp3.Interceptor
import okhttp3.Response

class CustomInterceptor : Interceptor {
    override fun intercept(chain: Interceptor.Chain) : Response {               
        val request = chain.request().newBuilder()
            .header("x-custom-header", "my-value")
            .build()
        return chain.proceed(request)
    }
}

Answer 4

如果您正在使用Retrofit库,那么您可以使用@Header注释直接将标头传递给api请求,而无需使用Interceptor.以下是显示如何向Retrofit api请求添加标头的示例.

@POST(apiURL)
void methodName(
        @Header(HeadersContract.HEADER_AUTHONRIZATION) String token,
        @Header(HeadersContract.HEADER_CLIENT_ID) String token,
        @Body TypedInput body,
        Callback<String> callback);

希望能帮助到你!

Answer 5

这里是一个有用的依据来自lfmingo

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();

Answer 6

还有另一种方法可以在 OkHttp3（截至目前的最新版本）中添加拦截器，即将拦截器添加到 Okhttp 构建器中

okhttpBuilder.networkInterceptors().add(chain -> {
 //todo add headers etc to your AuthorisedRequest

  return chain.proceed(yourAuthorisedRequest);
});

最后从这个构建器构建你的 okHttpClient

OkHttpClient client = builder.build();

Answer 7

科特林版本：

fun okHttpClientFactory(): OkHttpClient {
    return OkHttpClient().newBuilder()
        .addInterceptor { chain ->
            chain.request().newBuilder()
                .addHeader(HEADER_AUTHONRIZATION, O_AUTH_AUTHENTICATION)
                .build()
                .let(chain::proceed)
        }
        .build()
}

Answer 8

这对我有用：

class JSONHeaderInterceptor : Interceptor {
    override fun intercept(chain: Interceptor.Chain) : Response {
        val request = chain.request().newBuilder()
            .header("Content-Type", "application/json")
            .build()
        return chain.proceed(request)
    }
}

fun provideHttpClient(): OkHttpClient {
    val okHttpClientBuilder = OkHttpClient.Builder()
    okHttpClientBuilder.addInterceptor(JSONHeaderInterceptor())
    return okHttpClientBuilder.build()
}