Retrofit2.0+OkHttp设置统一的请求头(request headers)

有时候要求Retrofit2的接口中每个都要增加上headers，又不想做重复的事情，可以使用这种方法来为每个request请求都设置上相同的请求头header。

修改请求头request headers主要是通过拦截器来实现，下面是我自己根据需要设置的。如果还有增加其他的header，可以再进行增加。

 /**
     * 请求拦截器，修改请求header
     */
    private class RequestInterceptor implements Interceptor{

        @Override
        public Response intercept(Chain chain) throws IOException {
            Request request = chain.request()
                    .newBuilder()
                    .addHeader("Content-Type", "text/html; charset=UTF-8")
//                    .addHeader("Accept-Encoding", "*")
                    .addHeader("Connection", "keep-alive")
                    .addHeader("Accept", "*/*")
                    .addHeader("Access-Control-Allow-Origin", "*")
                    .addHeader("Access-Control-Allow-Headers", "X-Requested-With")
                    .addHeader("Vary", "Accept-Encoding")
//                    .addHeader("Cookie", "add cookies here")
                    .build();

            Log.v("zcb", "request:" + request.toString());
            Log.v("zcb", "request headers:" + request.headers().toString());

            return chain.proceed(request);
        }
    }

使用方法：

    private OkHttpClient getOkHttpClient() {
        //定制OkHttp
        OkHttpClient.Builder httpClientBuilder = new OkHttpClient
                .Builder();
        //设置超时时间
        httpClientBuilder.connectTimeout(DEFAULT_TIMEOUT, TimeUnit.SECONDS);
        httpClientBuilder.writeTimeout(DEFAULT_TIMEOUT, TimeUnit.SECONDS);
        httpClientBuilder.readTimeout(DEFAULT_TIMEOUT, TimeUnit.SECONDS);
        //使用拦截器
        httpClientBuilder.addInterceptor(new RequestInterceptor());
        httpClientBuilder.addInterceptor(new LogInterceptor());
        
        return httpClientBuilder.build();
    }