Specifying timeouts

To prevent unresponsive servers from indefinitely hanging a program, the urdl::istream class uses a timeout when opening the stream and when reading content.

urdl::istream is;

// Fail if the URL cannot be opened within 60 seconds.
is.open_timeout(60000);
is.open("http://somehost/path");

if (!is)
{
  // If the open operation timed out then:
  //   is.error() == boost::system::errc::timed_out
  // holds true.
}

...

// Fail if an individual read does not complete within 30 seconds.
is.read_timeout(30000);

// From here on, use urdl::istream like any other std::istream object.
std::string line;
while (std::getline(is, line))
{
  std::cout << line << std::endl;
}

// If a read operation timed out then:
//   is.error() == boost::system::errc::timed_out
// holds true.