[BUG] `ClientManager` should verify `db_url` is pointing to a chroma server before creating the client

[Davidyz]

Discussed in #239

^{Originally posted by ahakanbaba July 8, 2025}
This is the error message I am getting

$ vectorcode drop
ERROR: vectorcode.main : Traceback (most recent call last):
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpx/_transports/default.py", line 101, in map_httpcore_exceptions
    yield
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpx/_transports/default.py", line 394, in handle_async_request
    resp = await self._pool.handle_async_request(req)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpcore/_async/connection_pool.py", line 256, in handle_async_request
    raise exc from None
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpcore/_async/connection_pool.py", line 236, in handle_async_request
    response = await connection.handle_async_request(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpcore/_async/connection.py", line 103, in handle_async_request
    return await self._connection.handle_async_request(request)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpcore/_async/http11.py", line 136, in handle_async_request
    raise exc
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpcore/_async/http11.py", line 106, in handle_async_request
    ) = await self._receive_response_headers(**kwargs)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpcore/_async/http11.py", line 177, in _receive_response_headers
    event = await self._receive_event(timeout=timeout)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpcore/_async/http11.py", line 231, in _receive_event
    raise RemoteProtocolError(msg)
httpcore.RemoteProtocolError: Server disconnected without sending a response.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/vectorcode/main.py", line 86, in async_main
    return_val = await drop(final_configs)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/vectorcode/subcommands/drop.py", line 12, in drop
    async with ClientManager().get_client(config) as client:
  File "/usr/lib/python3.11/contextlib.py", line 210, in __aenter__
    return await anext(self.gen)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/vectorcode/common.py", line 268, in get_client
    if not await try_server(configs.db_url):
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/vectorcode/common.py", line 53, in try_server
    response = await client.get(url=heartbeat_url)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpx/_client.py", line 1768, in get
    return await self.request(
           ^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpx/_client.py", line 1540, in request
    return await self.send(request, auth=auth, follow_redirects=follow_redirects)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpx/_client.py", line 1629, in send
    response = await self._send_handling_auth(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpx/_client.py", line 1657, in _send_handling_auth
    response = await self._send_handling_redirects(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpx/_client.py", line 1694, in _send_handling_redirects
    response = await self._send_single_request(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpx/_client.py", line 1730, in _send_single_request
    response = await transport.handle_async_request(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpx/_transports/default.py", line 393, in handle_async_request
    with map_httpcore_exceptions():
  File "/usr/lib/python3.11/contextlib.py", line 158, in __exit__
    self.gen.throw(typ, value, traceback)
  File "/home/coder/.local/pipx/venvs/vectorcode/lib/python3.11/site-packages/httpx/_transports/default.py", line 118, in map_httpcore_exceptions
    raise mapped_exc(message) from exc
httpx.RemoteProtocolError: Server disconnected without sending a response.

This is the config file

$ cat .vectorcode/config.json5
// ~/.config/vectorcode/config.json5
{
  "hnsw": {
    "hnsw:M": 64,
    "hnsw:construction_ef": 200,
    "hnsw:search_ef": 20,
  },
}

The usually printed " Using the bundled chroma server... " is even not printing.