Do not "keep-alive" if "upgrade" was requested
Do not "keep-alive" if "upgrade" was requested

ghaderer/libmicrohttpd,maru/libmicrohttpd-http2,maru/libmicrohttpd-http2,ghaderer/libmicrohttpd,ghaderer/libmicrohttpd,maru/libmicrohttpd-http2