Support HEAD requests

qwarc/__init__.py

@@ -51,7 +51,7 @@ class Item:
 		#TODO: Rewrite using 'async with self.session.get'
 
 		url = yarl.URL(url) # Explicitly convert for normalisation, percent-encoding, etc.
-		assert method in ('GET', 'POST'), 'method must be GET or POST'
+		assert method in ('GET', 'POST', 'HEAD'), 'method must be GET, POST, or HEAD'
 		headers = self.headers + headers
 		#TODO Deduplicate headers with later values overriding earlier ones
 		history = []