basic example doesn't work

[madhur-tandon]

basic example doesn't work:

import os
import asyncio
from stagehand import Stagehand, StagehandConfig

async def main():
    # Configure Stagehand
    config = StagehandConfig(
        env="LOCAL",
        model_name="google/gemini-2.0-flash",
        model_client_options={"apiKey": "xxxxx"},
    )

    # Initialize Stagehand
    stagehand = Stagehand(config=config)
    await stagehand.init()
    print(f"Session created: {stagehand.session_id}")
    
    # Get page reference
    page = stagehand.page

    # Navigate to a page
    await page.goto("https://google.com/")

if __name__ == "__main__":
    asyncio.run(main())

and leads to the following:

2025-06-19 01:34:34 INFO - Launching new local browser context...
2025-06-19 01:34:35 INFO - Local browser context launched successfully.
Session created: None
2025-06-19 01:34:35 ERROR - [EXCEPTION] Header value must be str or bytes, not <class 'NoneType'>
Traceback (most recent call last):
  File "/Users/madhur/Desktop/stagehand/tranzit-py/vietnam.py", line 68, in <module>
    asyncio.run(main())
  File "/Users/madhur/miniforge3/envs/tranzit/lib/python3.10/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/Users/madhur/miniforge3/envs/tranzit/lib/python3.10/asyncio/base_events.py", line 649, in run_until_complete
    return future.result()
  File "/Users/madhur/Desktop/stagehand/tranzit-py/vietnam.py", line 47, in main
    await page.goto("https://google.com/")
  File "/Users/madhur/miniforge3/envs/tranzit/lib/python3.10/site-packages/stagehand/page.py", line 103, in goto
    result = await self._stagehand._execute("navigate", payload)
  File "/Users/madhur/miniforge3/envs/tranzit/lib/python3.10/site-packages/stagehand/api.py", line 111, in _execute
    async with self._client.stream(
  File "/Users/madhur/miniforge3/envs/tranzit/lib/python3.10/contextlib.py", line 199, in __aenter__
    return await anext(self.gen)
  File "/Users/madhur/miniforge3/envs/tranzit/lib/python3.10/site-packages/httpx/_client.py", line 1570, in stream
    request = self.build_request(
  File "/Users/madhur/miniforge3/envs/tranzit/lib/python3.10/site-packages/httpx/_client.py", line 367, in build_request
    headers = self._merge_headers(headers)
  File "/Users/madhur/miniforge3/envs/tranzit/lib/python3.10/site-packages/httpx/_client.py", line 430, in _merge_headers
    merged_headers.update(headers)
  File "/Users/madhur/miniforge3/envs/tranzit/lib/python3.10/site-packages/httpx/_models.py", line 275, in update
    headers = Headers(headers)
  File "/Users/madhur/miniforge3/envs/tranzit/lib/python3.10/site-packages/httpx/_models.py", line 156, in __init__
    bytes_value = _normalize_header_value(v, encoding)
  File "/Users/madhur/miniforge3/envs/tranzit/lib/python3.10/site-packages/httpx/_models.py", line 81, in _normalize_header_value
    raise TypeError(f"Header value must be str or bytes, not {type(value)}")
TypeError: Header value must be str or bytes, not <class 'NoneType'>

My editor also gives the following warning and these arguments seem like they follow JS based naming..

Arguments missing for parameters "apiKey", "projectId", "apiUrl", "modelApiKey", "verbose", "logger", "use_rich_logging", "domSettleTimeoutMs", "browserbaseSessionCreateParams", "enableCaching", "browserbaseSessionID", "modelName", "selfHeal", "waitForCaptchaSolves", "systemPrompt", "localBrowserLaunchOptions", "use_api", "experimental"Pylance[reportCallIssue](https://github.com/microsoft/pylance-release/blob/main/docs/diagnostics/reportCallIssue.md)
No parameter named "model_client_options"Pylance[reportCallIssue](https://github.com/microsoft/pylance-release/blob/main/docs/diagnostics/reportCallIssue.md)

I only did pip install stagehand and then playwright install in a fresh new conda environment

[madhur-tandon]

I also get
"goto" is not a known attribute of "None"Pylance[reportOptionalMemberAccess](https://github.com/microsoft/pylance-release/blob/main/docs/diagnostics/reportOptionalMemberAccess.md)
for await page.goto("https://google.com/") as a warning in my editor.

[miguelg719]

This is now solved right? we still need to revisit the editor complaints, but that might be a separate issue @madhur-tandon

[madhur-tandon]

Yes, solved with 0.0.6