fix: InvalidNegotiatedProtocol __str__ method

scrapy/core/http2/agent.py

@@ -68,7 +68,7 @@ class H2ConnectionPool:
 
         # Now as we have established a proper HTTP/2 connection
         # we fire all the deferred's with the connection instance
-        pending_requests = self._pending_requests.pop(key)
+        pending_requests = self._pending_requests.pop(key, None)
         while pending_requests:
             d = pending_requests.popleft()
             d.callback(conn)

scrapy/core/http2/protocol.py

@@ -39,7 +39,7 @@ class InvalidNegotiatedProtocol(H2Error):
         self.negotiated_protocol = negotiated_protocol
 
     def __str__(self) -> str:
-        return f'InvalidHostname: Expected h2 as negotiated protocol, received {self.negotiated_protocol!r}'
+        return f'InvalidNegotiatedProtocol: Expected h2 as negotiated protocol, received {self.negotiated_protocol!r}'
 
 
 class RemoteTerminatedConnection(H2Error):

scrapy/core/http2/stream.py

@@ -31,6 +31,9 @@ class InactiveStreamClosed(ConnectionClosed):
     def __init__(self, request: Request):
         self.request = request
 
+    def __str__(self) -> str:
+        return f'InactiveStreamClosed: Connection was closed without sending the request {self.request!r}'
+
 
 class InvalidHostname(H2Error):