“获取时超时”URLFetch GAE / J.

Question

I'm using the XMLReader to simply read a feed like below.

URLConnection urlConnection = url.openConnection(); 
XmlReader reader = new XmlReader(urlConnection); 

When this is called I receive within 5 seconds an IOException "Timeout while fetching". So I tried to set the timeouts to the max. (10 sec) but still no luck and still an IOExeption in 5 sec.

urlConnection.setConnectTimeout(10000); 

(the max is stated in documentation: http://code.google.com/intl/nl-NL/appengine/docs/java/urlfetch/overview.html )

Seems that the size of the feed is too large. When I call a smaller feed it works properly. Is there any workaround or solution for this? I need to be able to call larger feeds.

Answer 1

You should use setReadTimeout method that sets the read deadline:

urlConnection.setReadTimeout(10000); //10 Sec

You should be able to download larger feeds in 10 seconds.
If you still have problem, try to fiddle with this different approach.

Answer 2

The reason is:

If no data is available for the read timeout period, exception can be thrown. From the doc of Oracle

A SocketTimeoutException can be thrown when reading from the returned input stream if the read timeout expires before data is available for read.

By the way, ReadTimeout is different with ConnectTimeout , the read timeout is the timeout to get data from the host, see different connection timeout and read timeout

So as @systempuntoout answer, need to set read timeout.