Connection: close headers to disable http-keep-alive

Some Connection: close headers are needed so clients know that
servefile does not support keepalive connections.

servefile

@@ -74,6 +74,7 @@ class FileBaseHandler(BaseHTTPServer.BaseHTTPRequestHandler):
 
 		if fileLength >= 0:
 			self.send_header('Content-Length', str(fileLength))
+		self.send_header('Connection', 'close')
 		self.send_header('Last-Modified', lastModified)
 		self.send_header('Content-Type', 'application/octet-stream')
 		self.send_header('Content-Disposition', 'attachment; filename="%s"' % fileName)
@@ -339,6 +340,7 @@ class DirListingHandler(FileBaseHandler):
 				</body>
 				</html>""" % self.escapeHTML(urllib.unquote(self.path))
 			self.send_header("Content-Length", str(len(errorMsg)))
+			self.send_header('Connection', 'close')
 			self.end_headers()
 			if not head:
 				self.wfile.write(errorMsg)
@@ -452,6 +454,7 @@ class DirListingHandler(FileBaseHandler):
 			self.end_headers()
 			return
 		self.send_header("Content-Length", str(len(listing)))
+		self.send_header('Connection', 'close')
 		self.end_headers()
 		self.wfile.write(listing)
 
@@ -596,6 +599,7 @@ class FilePutter(BaseHTTPServer.BaseHTTPRequestHandler):
 		self.send_response(code)
 		self.send_header('Content-Type', 'text/html')
 		self.send_header('Content-Length', str(len(msg)))
+		self.send_header('Connection', 'close')
 		self.end_headers()
 		self.wfile.write(msg)