Is it uncommon for a foreign head of state to address the US Congress while the President is out of the country?

Without getting into the details of what PM Netanyahu is surely going to be discussing, it feels strange to me that he’s addressing Congress about US policy while the President, who formally sets and executes that policy, is representing the nation in another country.

Is there precedent for this (Googleable, I’m sure), and how common? How was it received in the past?

admission: I’m an American living abroad, blissfully ignorant of US cable news