PocoDNSTestCase.cpp

#include <Poco/Net/HTTPClientSession.h>
#include <Poco/Net/HTTPRequest.h>
#include <Poco/Net/HTTPResponse.h>
#include <Poco/StreamCopier.h>
#include <iostream>

/*
*	Test case to show slow DNS lookup when making a request to a 
*	particular domain. The HTTP level in terms of the response 
*	is not that important- the actual lookup happens as part of 
*	creating a Net::SocketAddress in Net::HTTPClientSession::reconnect()
*
*	Compiled with:
*	g++ -o"PocoDNSTestCase" PocoDNSTestCase.cpp -lPocoUtil -lPocoNet
*	and ran with : ./PocoDNSTestCase
*/	

using namespace Poco::Net;

#define BROKEN_DOMAIN "word-view.beta.officeapps.live.com"

int main(int argc, char *argv[]){
	//isolated test of the problem domain

	HTTPClientSession hcs(BROKEN_DOMAIN);
	// send request
	HTTPRequest req(HTTPRequest::HTTP_GET, "/", HTTPMessage::HTTP_1_1);
	hcs.sendRequest(req); //hangs here- DNS lookup takes a long time

	// get response
	HTTPResponse res;
	std::cerr<< res.getStatus() << " " << res.getReason() << std::endl;

	// print response
	std::istream &is = hcs.receiveResponse(res);
	Poco::StreamCopier::copyStream(is, std::cerr);
}