Fix some issues, improve documentation

server/requesthandler.py

@@ -57,7 +57,7 @@ class RequestHandler:
                 retriever = Retriever.create(self.conn, headers)
             except UnsupportedEncoding as e:
                 logging.error("Encoding not supported: %s=%s", e.enc_type, e.encoding)
-                raise NotImplemented()
+                raise NotImplemented(f"{e.enc_type}={e.encoding}")
 
             for buffer in retriever.retrieve():
                 body += buffer
@@ -68,7 +68,7 @@ class RequestHandler:
 
         cmd = command.create(message)
         msg = cmd.execute()
-        logging.debug("---response begin---\r\n%s---response end---", msg)
+        logging.debug("---response begin---\r\n%s\r\n---response end---", msg.split(b"\r\n\r\n", 1)[0].decode(FORMAT))
         self.conn.conn.sendall(msg)
 
     def _check_request_line(self, method: str, target: Union[ParseResultBytes, ParseResult], version):
@@ -77,22 +77,22 @@ class RequestHandler:
             raise MethodNotAllowed(METHODS)
 
         if version not in ("1.0", "1.1"):
-            raise HTTPVersionNotSupported()
+            raise HTTPVersionNotSupported(version)
 
         # only origin-form and absolute-form are allowed
         if target.scheme not in ("", "http"):
             # Only http is supported...
-            raise BadRequest()
+            raise BadRequest(f"scheme={target.scheme}")
 
         if target.netloc != "" and target.netloc != self.conn.host and target.netloc != self.conn.host.split(":")[0]:
-            raise NotFound()
+            raise NotFound(str(target))
 
         if target.path == "" or target.path[0] != "/":
-            raise NotFound()
+            raise NotFound(str(target))
 
     def _validate_request(self, msg):
         if msg.version == "1.1" and "host" not in msg.headers:
-            raise BadRequest()
+            raise BadRequest("Missing host header")
 
         self._check_request_line(msg.method, msg.target, msg.version)
 
@@ -119,5 +119,5 @@ class RequestHandler:
         message += "Content-Length: 0\r\n"
         message += "\r\n"
 
-        logging.debug("Sending: %r", message)
+        logging.debug("---response begin---\r\n%s---response end---", message)
         client.sendall(message.encode(FORMAT))