Corrected docs & tests re that headers must use bytestrings. (#1246)

docs/topics/consumers.rst

@@ -328,7 +328,7 @@ primitives to implement a HTTP endpoint::
  async def handle(self, body):
  await asyncio.sleep(10)
  await self.send_response(200, b"Your response bytes", headers=[
- ("Content-Type", "text/plain"),
+ (b"Content-Type", b"text/plain"),
  ])
 
 You are expected to implement your own ``handle`` method. The
@@ -352,7 +352,7 @@ be explained in detail later::
  class LongPollConsumer(AsyncHttpConsumer):
  async def handle(self, body):
  await self.send_headers(headers=[
- ("Content-Type", "application/json"),
+ (b"Content-Type", b"application/json"),
  ])
  # Headers are only sent after the first body event.
  # Set "more_body" to tell the interface server to not
@@ -372,9 +372,9 @@ Of course you can also use those primitives to implement a HTTP endpoint for
  class ServerSentEventsConsumer(AsyncHttpConsumer):
  async def handle(self, body):
  await self.send_headers(headers=[
- ("Cache-Control", "no-cache"),
- ("Content-Type", "text/event-stream"),
- ("Transfer-Encoding", "chunked"),
+ (b"Cache-Control", b"no-cache"),
+ (b"Content-Type", b"text/event-stream"),
+ (b"Transfer-Encoding", b"chunked"),
  ])
  while True:
  payload = "data: %s\n\n" % datetime.now().isoformat()

tests/test_generic_http.py

@@ -18,7 +18,7 @@ async def handle(self, body):
  await self.send_response(
  200,
  json.dumps({"value": data["value"]}).encode("utf-8"),
- headers={"Content-Type": "application/json"},
+ headers={b"Content-Type": b"application/json"},
  )
 
  # Open a connection
@@ -31,4 +31,4 @@ async def handle(self, body):
  response = await communicator.get_response()
  assert response["body"] == b'{"value": 42}'
  assert response["status"] == 200
- assert response["headers"] == [("Content-Type", "application/json")]
+ assert response["headers"] == [(b"Content-Type", b"application/json")]