春季集成RSS源 - 403錯誤

Question

我正在嘗試使用Spring集成輪詢RSS源，並且我正在使用SO用戶源URL作爲示例。然而，當應用程序運行時我得到以下錯誤：

Disconnected from the target VM, address: '127.0.0.1:58603', transport: 'socket' 
2016-03-04 19:34:36.252 ERROR 2345 --- [ask-scheduler-4] o.s.integration.handler.LoggingHandler : org.springframework.messaging.MessagingException: Failed to retrieve feed at url 'http://stackoverflow.com/feeds/user/813852'; nested exception is com.rometools.fetcher.FetcherException: Authentication required for that resource. HTTP Response code was:403 
    at org.springframework.integration.feed.inbound.FeedEntryMessageSource.getFeed(FeedEntryMessageSource.java:216) 
    at org.springframework.integration.feed.inbound.FeedEntryMessageSource.populateEntryList(FeedEntryMessageSource.java:182) 
    at org.springframework.integration.feed.inbound.FeedEntryMessageSource.doReceive(FeedEntryMessageSource.java:157) 
    at org.springframework.integration.feed.inbound.FeedEntryMessageSource.receive(FeedEntryMessageSource.java:122) 
    at org.springframework.integration.endpoint.SourcePollingChannelAdapter.receiveMessage(SourcePollingChannelAdapter.java:175) 
    at org.springframework.integration.endpoint.AbstractPollingEndpoint.doPoll(AbstractPollingEndpoint.java:224) 
    at org.springframework.integration.endpoint.AbstractPollingEndpoint.access$000(AbstractPollingEndpoint.java:57) 
    at org.springframework.integration.endpoint.AbstractPollingEndpoint$1.call(AbstractPollingEndpoint.java:176) 
    at org.springframework.integration.endpoint.AbstractPollingEndpoint$1.call(AbstractPollingEndpoint.java:173) 
    at org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller$1.run(AbstractPollingEndpoint.java:330) 
    at org.springframework.integration.util.ErrorHandlingTaskExecutor$1.run(ErrorHandlingTaskExecutor.java:55) 
    at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) 
    at org.springframework.integration.util.ErrorHandlingTaskExecutor.execute(ErrorHandlingTaskExecutor.java:51) 
    at org.springframework.integration.endpoint.AbstractPollingEndpoint$Poller.run(AbstractPollingEndpoint.java:324) 
    at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54) 
    at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81) 
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) 
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) 
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    at java.lang.Thread.run(Thread.java:745) 
Caused by: com.rometools.fetcher.FetcherException: Authentication required for that resource. HTTP Response code was:403 
    at com.rometools.fetcher.impl.AbstractFeedFetcher.throwAuthenticationError(AbstractFeedFetcher.java:183) 
    at com.rometools.fetcher.impl.AbstractFeedFetcher.handleErrorCodes(AbstractFeedFetcher.java:170) 
    at com.rometools.fetcher.impl.HttpURLFeedFetcher.retrieveAndCacheFeed(HttpURLFeedFetcher.java:186) 
    at com.rometools.fetcher.impl.HttpURLFeedFetcher.retrieveFeed(HttpURLFeedFetcher.java:140) 
    at com.rometools.fetcher.impl.HttpURLFeedFetcher.retrieveFeed(HttpURLFeedFetcher.java:99) 
    at org.springframework.integration.feed.inbound.FeedEntryMessageSource.getFeed(FeedEntryMessageSource.java:204) 
    ... 22 more 

的URL加載罰款通過瀏覽器（甚至在隱身模式，因此該錯誤信息可能誤導）。我下載了一個RSS閱讀器，並且Feed正常運行。

我這是怎麼配置的飼料：

<int-feed:inbound-channel-adapter id="stackOverflow" 
             channel="log" 
             url="http://stackoverflow.com/feeds/user/813852"> 
     <int:poller fixed-rate="10000" max-messages-per-poll="100" /> 
</int-feed:inbound-channel-adapter> 
<int:logging-channel-adapter id="log" level="DEBUG" /> 

我也嘗試另一個RSS提要URL和它的工作。任何想法可能是錯的？

Answer 1

我只是跑了Wireshark的痕跡，它看起來像StackOverflow的不喜歡的Java用戶代理：

User-Agent: Java/1.8.0_66\r\n 

... 

<p>The owner of this website (stackoverflow.com) has banned your access based 
on your browser's signature (27e797571e1923de-ua21).</p>\n 

設置自定義用戶代理去解決這個限制：

public class CustomFeedFetcher extends HttpURLFeedFetcher { 
    @Override 
    public void setUserAgent(String s) { 
     super.setUserAgent("AgentName"); 
    } 
}