in uber-core/src/main/java/com/uber/sdk/core/client/internal/ApiInterceptor.java [48:58]
public Response intercept(Chain chain) throws IOException {
Request.Builder requestBuilder = chain.request().newBuilder();
requestBuilder.addHeader(HEADER_ACCEPT_LANGUAGE,
authenticator.getSessionConfiguration().getLocale().getLanguage());
requestBuilder.addHeader(HEADER_USER_AGENT, "Java Rides SDK v" + LIB_VERSION);
authenticator.signRequest(requestBuilder);
return chain.proceed(requestBuilder.build());
}