java 通过 OkHttp Interceptors 拦截重试调用
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Intercept and retry call by means of OkHttp Interceptors
提问by Araz Abishov
I need to retry request inside of OkHttp Interceptor. For example there is incoming request which needs Authorizationtoken. If Authorizationtoken is expired, server returns response with 403code. In this case I am retrieving a new token and trying to make call again by using the same chainobject.
我需要在OkHttp Interceptor. 例如，有需要Authorization令牌的传入请求。如果Authorization令牌过期，服务器返回带有403代码的响应。在这种情况下，我正在检索一个新令牌并尝试使用相同的chain对象再次进行调用。
But OkHttp throws an exception, which states that you cannot make two requests with the same chainobject.
但是 OkHttp 抛出了一个异常，指出不能用同一个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
I wonder if there is a clean solution to this problem of retrying network request inside of OkHttp Interceptor?
我想知道在内部重试网络请求的问题是否有一个干净的解决方案OkHttp Interceptor？
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;
}
}
回答by Jake Wharton
Use .interceptors()instead of .networkInterceptors()which are allowed to call .proceed()more than once.
使用.interceptors()代替.networkInterceptors()which 允许.proceed()多次调用。
For more information see: https://square.github.io/okhttp/interceptors/
