diff --git a/sanic/server.py b/sanic/server.py
index fd31680e..81b56bad 100644
--- a/sanic/server.py
+++ b/sanic/server.py
@@ -99,6 +99,7 @@ class HttpProtocol(asyncio.Protocol):
         self._request_handler_task = None
         self._request_stream_task = None
         self._keep_alive = keep_alive
+        self._header_fragment = b''
         self.state = state if state else {}
         if 'requests_count' not in self.state:
             self.state['requests_count'] = 0
@@ -173,14 +174,25 @@ class HttpProtocol(asyncio.Protocol):
             self.write_error(exception)
 
     def on_url(self, url):
-        self.url = url
+        if not self.url:
+            self.url = url
+        else:
+            self.url += url
 
     def on_header(self, name, value):
-        if name == b'Content-Length' and int(value) > self.request_max_size:
-            exception = PayloadTooLarge('Payload Too Large')
-            self.write_error(exception)
+        self._header_fragment += name
 
-        self.headers.append((name.decode().casefold(), value.decode()))
+        if value is not None:
+            if self._header_fragment == b'Content-Length' \
+                    and int(value) > self.request_max_size:
+                exception = PayloadTooLarge('Payload Too Large')
+                self.write_error(exception)
+
+            self.headers.append(
+                    (self._header_fragment.decode().casefold(),
+                     value.decode()))
+
+            self._header_fragment = b''
 
     def on_headers_complete(self):
         self.request = self.request_class(