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Refreshing OAuth token with okhttp interceptors. All requests will wait until token refresh finished, and then will continue with the new token.
private class HttpInterceptor implements Interceptor {
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
//Build new request
Request.Builder builder = request.newBuilder();
builder.header("Accept", "application/json"); //if necessary, say to consume JSON
String token = settings.getAccessToken(); //save token of this request for future
setAuthHeader(builder, token); //write current token to request
request =; //overwrite old request
Response response = chain.proceed(request); //perform request, here original request will be executed
if (response.code() == 401) { //if unauthorized
synchronized (httpClient) { //perform all 401 in sync blocks, to avoid multiply token updates
String currentToken = settings.getAccessToken(); //get currently stored token
if(currentToken != null && currentToken.equals(token)) { //compare current token with token that was stored before, if it was not updated - do update
int code = refreshToken() / 100; //refresh token
if(code != 2) { //if refresh token failed for some reason
if(code == 4) //only if response is 400, 500 might mean that token was not updated
logout(); //go to login screen
return response; //if token refresh failed - show error to user
if(settings.getAccessToken() != null) { //retry requires new auth token,
setAuthHeader(builder, settings.getAccessToken()); //set auth token to updated
request =;
return chain.proceed(request); //repeat request with new token
return response;
private void setAuthHeader(Request.Builder builder, String token) {
if (token != null) //Add Auth token to each request if authorized
builder.header("Authorization", String.format("Bearer %s", token));
private int refreshToken() {
//Refresh token, synchronously, save it, and return result code
//you might use retrofit here
private int logout() {
//logout your user
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