Simple program to get data using HTTP.

ipv6test.cc

#include <iostream>
#include <cstdlib>
#include <event.h>
#include <evhttp.h>
#include <event2/dns.h>
#include <event2/event.h>

using namespace std;


static void request_cb(struct evhttp_request *req, void *state) {

	cout << "started request_cb." << endl;

        printf("in reqhandler. state == %s\n", (char *) state);
	string body;
	if (req == NULL) {
		cout << "Server returned NULL." << endl;
	} else {
                cout << "response code:" << req->response_code << endl;
		int len = evbuffer_get_length(req->input_buffer);
		void *buf = malloc(len);
		evbuffer_copyout(req->input_buffer, buf, len);
		
		body = string(static_cast<char*>(buf), len);
		
		free(buf);
		
		cout << "BODY LEN:" << endl << len << endl;
		cout << "BODY:" << endl << body << endl;
	}

	cout << "finished request_cb." << endl;
  

}

int main(int argc, char *argv[]) {
	cout << "ipv6test.cc started  " << endl;

	//show version used in runtime
	const char *libeventver = event_get_version();
	cout << "using libevent version:" << libeventver << endl;

	//showing debug messages requires libevent compile time debug flags
	event_enable_debug_mode();
	//event_set_log_callback(logfn);

	//prepare request data to use
	string url = "/index.html";

	//ipv6 data -not working
	const char *addr = "[::1]";
	string remote_host ="ip6-localhost";

	//ipv4 data -working 
	//const char *addr = "127.0.0.1";
	//string remote_host ="localhost";

	cout << "initializing libevent subsystem." << endl;
	struct event_base* base = event_init();
	unsigned int port = 80;
        cout << "Connecting to addr:" << addr << " sending header Host:" << remote_host << " fetching url:" << url << endl;

	cout << "before creating connection." << endl;
	struct evhttp_connection *connection = evhttp_connection_new(addr, port);
        if (connection == NULL){
	     cout << "connection is null - failed new connection" << endl;
        }
	else
	{
	    cout << "connection is not null " << endl;
	}

	struct evhttp_request *request;
	
	request = evhttp_request_new(request_cb, NULL);
	evhttp_add_header(request->output_headers, "Host", remote_host.c_str());
	evhttp_add_header(request->output_headers, "Content-Length", "0");
	if (evhttp_make_request(connection, request, EVHTTP_REQ_GET, url.c_str())==-1){
	    cout << "failed making request" << endl;
	}
        else
        {
	    cout << "NOT failed" << endl;

        };
	cout << "after make request" << endl;

	event_dispatch();
}