Add in HTTP/2 support with right deps and log info

daphne/server.py

@@ -4,6 +4,7 @@ import warnings
 from twisted.internet import reactor, defer
 from twisted.internet.endpoints import serverFromString
 from twisted.logger import globalLogBeginner, STDLibLogObserver
+from twisted.web import http
 
 from .http_protocol import HTTPFactory
 
@@ -84,6 +85,12 @@ class Server(object):
         else:
             globalLogBeginner.beginLoggingTo([STDLibLogObserver(__name__)])
 
+        # Detect what Twisted features are enabled
+        if http.H2_ENABLED:
+            logger.info("HTTP/2 support enabled")
+        else:
+            logger.info("HTTP/2 support not enabled (install the http2 and tls Twisted extras)")
+
         # Disabled deliberately for the moment as it's worse performing
         if "twisted" in self.channel_layer.extensions and False:
             logger.info("Using native Twisted mode on channel layer")

setup.py

@@ -24,7 +24,7 @@ setup(
     include_package_data=True,
     install_requires=[
         'asgiref>=1.0.0',
-        'twisted>=16.0',
+        'twisted>=17.0',
         'autobahn>=0.12',
     ],
     extras_require={