You need to set no-cache headers because it seems the urlfetchservice caches
the responses. I use the HttpRequest method for downloading fresh content
like this:
HTTPRequest request = new HTTPRequest(uri.toURL());
//Without these headers, AppEngine caches the url fetch
request.setHeader(new HTTPHeader("Cache-Control", "no-cache,max-age=0"));
request.setHeader(new HTTPHeader("Pragma", "no-cache"));
Future<HTTPResponse> future = this.urlFetchService.fetchAsync(request);
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