Add troubleshooting.md

docs/index.rst

@@ -24,6 +24,7 @@ Guides
    sanic/testing
    sanic/deploying
    sanic/extensions
+   sanic/troubleshooting
    sanic/contributing
 
 

docs/sanic/troubleshooting.md

@@ -0,0 +1,54 @@
+# Troubleshooting
+
+## ERROR: NoneType: None in console
+
+The message `ERROR: NoneType: None` is caused by timeout error caused by request not occuring in Keep-Alive.
+There are two methods not to display a message.
+
+* Invalidating Keep-Alive.
+
+```python
+from sanic.config import Config
+Config.KEEP_ALIVE = False
+```
+
+* Setting custom protocol.
+
+```python
+from time import time
+from sanic import Sanic
+from sanic.response import json
+from sanic.config import Config
+from sanic.server import HttpProtocol
+from sanic.exceptions import RequestTimeout
+
+
+class CustomHttpProtocol(HttpProtocol):
+
+    def connection_timeout(self):
+        current_time = time()
+        time_elapsed = current_time - self._last_request_time
+        if time_elapsed < self.request_timeout:
+            time_left = self.request_timeout - time_elapsed
+            self._timeout_handler = ( 
+                self.loop.call_later(time_left, self.connection_timeout))
+        else:
+            if self._request_handler_task:
+                self._request_handler_task.cancel()
+            if self._total_request_size == 0:
+                self.transport.close()
+            else:
+                exception = RequestTimeout('Request Timeout')
+                self.write_error(exception)
+
+
+app = Sanic()
+
+
+@app.route("/")
+async def handler(request):
+        return json({"hello": "world"})
+
+if __name__ == "__main__":
+    app.run(host="127.0.0.1", port=8000, protocol=CustomHttpProtocol)
+```