Question

我需要在OkHttp Interceptor内重试请求。例如，存在需要Authorization令牌的传入请求。如果Authorization令牌过期，则服务器返回带有403代码的响应。在这种情况下，我正在检索新令牌，并尝试使用相同的chain对象再次拨打电话。

但OkHttp会抛出一个异常，该异常表明您不能使用相同的chain对象发出两个请求。

java.lang.IllegalStateException: network interceptor org.app.api.modules.ApplicationApiHeaders@559da2 must call proceed() exactly once

我想知道在OkHttp Interceptor内重试网络请求的问题是否有一个干净的解决方案？

public final class ApplicationApiHeaders implements Interceptor {
    private static final String AUTHORIZATION = "Authorization";
    private TokenProvider mProvider;

    public ApplicationApiHeaders(TokenProvider provider) {
        mProvider = provider;
    }

    @Override
    public Response intercept(Chain chain) throws IOException {
        Token token = mProvider.getApplicationToken();
        String bearerToken = "Bearer " + token.getAccessToken();

        System.out.println("Token: " + bearerToken);
        Request request = chain.request();
        request = request.newBuilder()
                .addHeader(AUTHORIZATION, bearerToken)
                .build();

        Response response = chain.proceed(request);
        if (!response.isSuccessful() && isForbidden(response.code())) {
            Token freshToken = mProvider.invalidateAppTokenAndGetNew();
            String freshBearerToken = freshToken.getAccessToken();

            Request newRequest = chain.request();
            newRequest = newRequest.newBuilder()
                    .addHeader(AUTHORIZATION, freshBearerToken)
                    .build();

            response = chain.proceed(newRequest);
        }

        return response;
    }

    private static boolean isForbidden(int code) {
        return code == HttpURLConnection.HTTP_FORBIDDEN;
    }
}

Answer 1

使用.interceptors()代替.networkInterceptors()，允许多次拨打.proceed()。

有关详细信息，请参阅：https://github.com/square/okhttp/wiki/Interceptors

通过OkHttp拦截器拦截和重试呼叫

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