Bad access exception in Poco::Net::HTTPClientSession when network connection is lost - poco-libraries

Question

When I run the following code without a network connection, I get a bad access error on the last line.
Poco::URI uri(sRemoteLoggingURL);
HTTPClientSession session(uri.getHost(), uri.getPort());
HTTPRequest request(HTTPRequest::HTTP_POST, uri.getPathAndQuery());
request.set("User-Agent", "Poco");
string reqBody = "{\"logMessage\":\""+ message + "\", \"application_name\":\""+ sAppName +"\"}";
request.setContentLength( reqBody.length() );
std::ostream& sessionStream = session.sendRequest(request);
Is this expected behavior? Do I need to check for network connectivity before I try to send a request? If so, how do I do that? I've tried session.connected(), but that is returning false even when I do have a network connection.

Answer 1

I think I figured it out. Apparently, you need to be sure to call reset on the session before you destroy it (or before it goes out of scope) if there's an exception. This code works:
Poco::URI uri(sRemoteLoggingURL);
HTTPClientSession session(uri.getHost(), uri.getPort());
try{
HTTPRequest request(HTTPRequest::HTTP_POST, uri.getPathAndQuery());
request.set("User-Agent", "Poco");
string reqBody = "{\"logMessage\":\""+ message + "\", \"application_name\":\""+ sAppName +"\"}";
request.setContentLength( reqBody.length() );
std::ostream& sessionStream = session.sendRequest(request);
if (sessionStream.good()) {
sessionStream << reqBody;
HTTPResponse res;
string text;
istream &is = session.receiveResponse(res);
StreamCopier::copyToString(is, text);
}
}catch(Poco::Exception& e){
// apparently, you MUST call reset before destroying the session, or you'll crash
session.reset();
sdfLog::logFormat("appContent::doIdle Poco::Exception: %s\n", e.what());
}catch(...){
session.reset();
sdfLog::logFormat("appContent::doIdle exception in remote logger %s\n");
}