Java 如何向 OkHttp 请求拦截器添加标头？

How to add headers to OkHttp request interceptor?

提问by Morteza Rastgoo

I have this interceptor that i add to my OkHttp client:

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;
}
}

How can i add headers to request in my interceptor?

如何在拦截器中向请求添加标头？

I tried this but i am making mistake and i lose my request when creating new request:

我试过这个，但我犯了一个错误，我在创建新请求时丢失了我的请求：

    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);
    }
}

Note that, i know i can add header when creating request like this:

请注意，我知道我可以在创建这样的请求时添加标头：

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();

But it doesn't fit my needs. I need it in interceptor.

但它不符合我的需求。我在拦截器中需要它。

采纳答案by Morteza Rastgoo

Finally, I added the headers this way:

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);
    }

回答by Rajesh

If you are using Retrofit library then you can directly pass header to api request using @Headerannotation without use of Interceptor. Here is example that shows how to add header to Retrofit api request.

如果您使用的是 Retrofit 库，那么您可以使用@Header注释直接将标头传递给 api 请求，而无需使用拦截器。这是显示如何向 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);

Hope it helps!

希望能帮助到你！

回答by Kushagar Lall

There is yet an another way to add interceptors in your OkHttp3 (latest version as of now) , that is you add the interceptors to your Okhttp builder

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);
});

and finally build your okHttpClient from this builder

最后从这个构建器构建你的 okHttpClient

OkHttpClient client = builder.build();

回答by gaurang

you can do it this way

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();
    }

回答by chebaby

here is a useful gistfrom lfmingo

这是来自lfmingo的有用要点

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();

回答by Alex Nolasco

Faced similar issue with other samples, this Kotlin class worked for me

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)
    }
}

回答by MingalevME

package com.example.network.interceptors;

import androidx.annotation.NonNull;

import java.io.IOException;
import java.util.Map;

import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;

public class RequestHeadersNetworkInterceptor implements Interceptor {

    private final Map<String, String> headers;

    public RequestHeadersNetworkInterceptor(@NonNull Map<String, String> headers) {
        this.headers = headers;
    }

    @NonNull
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request.Builder builder = chain.request().newBuilder();
        for (Map.Entry<String, String> header : headers.entrySet()) {
            if (header.getKey() == null || header.getKey().trim().isEmpty()) {
                continue;
            }
            if (header.getValue() == null || header.getValue().trim().isEmpty()) {
                builder.removeHeader(header.getKey());
            } else {
                builder.header(header.getKey(), header.getValue());
            }
        }
        return chain.proceed(builder.build());
    }

}

Example of usage:

用法示例：

httpClientBuilder.networkInterceptors().add(new RequestHeadersNetworkInterceptor(new HashMap<String, String>()
{
    {
        put("User-Agent", getUserAgent());
        put("Accept", "application/json");
    }
}));