Description
If I try to check if a dbfs folder exists on databricks instance, with code like client.dbfs.exists('/mnt'), I get error "InvalidParameterValue: Path must be absolute: \mnt".

The issue happens on windows only.

Reproduction

1. On Windows start ipython
2. use following code:
   import logging import argparse from databricks.sdk import WorkspaceClient from databricks.sdk.service.compute import DataSecurityMode, RuntimeEngine, Library from datetime import timedelta import os client = WorkspaceClient() client.dbfs.exists('/mnt')
3. Error message:
   InvalidParameterValue: Path must be absolute: \mnt

Expected behavior
"true" or "false", depending on whether the path exists on databricks.

Is it a regression?
I didn't try.

Debug Logs
'Cell In[11], line 1
----> 1 client.dbfs.exists('/mnt')

File C:\ProgramData\anaconda3\envs\databricks2\lib\site-packages\databricks\sdk\mixins\files.py:572, in DbfsExt.exists(self, path)
570 """If file exists on DBFS"""
571 p = self._path(path)
--> 572 return p.exists()

File C:\ProgramData\anaconda3\envs\databricks2\lib\site-packages\databricks\sdk\mixins\files.py:490, in _DbfsPath.exists(self)
488 def exists(self) -> bool:
489 try:
--> 490 self._api.get_status(self.as_string)
491 return True
492 except NotFound:

File C:\ProgramData\anaconda3\envs\databricks2\lib\site-packages\databricks\sdk\service\files.py:624, in DbfsAPI.get_status(self, path)
621 if path is not None: query['path'] = path
622 headers = {'Accept': 'application/json', }
--> 624 res = self._api.do('GET', '/api/2.0/dbfs/get-status', query=query, headers=headers)
625 return FileInfo.from_dict(res)

File C:\ProgramData\anaconda3\envs\databricks2\lib\site-packages\databricks\sdk\core.py:132, in ApiClient.do(self, method, path, query, headers, body, raw, files, data, response_headers)
128 headers['User-Agent'] = self._user_agent_base
129 retryable = retried(timeout=timedelta(seconds=self._retry_timeout_seconds),
130 is_retryable=self._is_retryable,
131 clock=self._cfg.clock)
--> 132 response = retryable(self._perform)(method,
133 path,
134 query=query,
135 headers=headers,
136 body=body,
137 raw=raw,
138 files=files,
139 data=data)
141 resp = dict()
142 for header in response_headers if response_headers else []:

File C:\ProgramData\anaconda3\envs\databricks2\lib\site-packages\databricks\sdk\retries.py:54, in retried..decorator..wrapper(*args, **kwargs)
50 retry_reason = f'{type(err).name} is allowed to retry'
52 if retry_reason is None:
53 # raise if exception is not retryable
---> 54 raise err
56 logger.debug(f'Retrying: {retry_reason} (sleeping ~{sleep}s)')
57 clock.sleep(sleep + random())

File C:\ProgramData\anaconda3\envs\databricks2\lib\site-packages\databricks\sdk\retries.py:33, in retried..decorator..wrapper(*args, **kwargs)
31 while clock.time() < deadline:
32 try:
---> 33 return func(*args, **kwargs)
34 except Exception as err:
35 last_err = err

File C:\ProgramData\anaconda3\envs\databricks2\lib\site-packages\databricks\sdk\core.py:243, in ApiClient._perform(self, method, path, query, headers, body, raw, files, data)
239 if not response.ok: # internally calls response.raise_for_status()
240 # TODO: experiment with traceback pruning for better readability
241 # See https://stackoverflow.com/a/58821552/277035
242 payload = response.json()
--> 243 raise self._make_nicer_error(response=response, **payload) from None
244 # Private link failures happen via a redirect to the login page. From a requests-perspective, the request
245 # is successful, but the response is not what we expect. We need to handle this case separately.
246 if _is_private_link_redirect(response):

InvalidParameterValue: Path must be absolute: \mnt'

Other Information

• OS: Windows
• Version: 10 Enterprise
• databricks-sdk 0.28.0
• databricks-api 0.9.0

Additional context
If I manually add the following row in Lib\site-packages\databricks\sdk\core.py , the code returns correct 'true' value:
def do(self, method: str, path: str, query: dict = None, headers: dict = None, body: dict = None, raw: bool = False, files=None, data=None, response_headers: List[str] = None) -> Union[dict, BinaryIO]: logger.warning(f"AAA path:{path}; method:{method}; query:{query}; headers:{headers}; body:{body}; raw:{raw}; files:{files}; data:{data}; response_headers:{response_headers}") if 'path' in query: query['path'] = query['path'].replace('\\', '/')