Add URL path to client URL in in Client._parse_host()

[bplunkert]

This fix for #113 allows instantiating a client with a custom URL path as part of the host argument.

Resolves #244
Resolves #113

[HorseCheng]

Someone please approve the PR and merge the code. 🥺

ChatOllama uses this library, which has an issue that needs to be addressed as well.
The sample code below shows that the URL path "copilot" is not passed in:

from langchain_ollama import ChatOllama

chat_model = ChatOllama(
    model="llama3.1",
    base_url = "https://aaaaaaaaaaa.com/copilot"
)

chat_model.invoke("hello")

[jason-heo]

Resolves #244 as well.

I'd love to see this PR get merged.

[mxyng]

Thanks for the PR. I can merge this is you add some doc tests. Something like this should be sufficient:

  >>> _parse_host('example.com/path')
  'http://example.com:11434/path'
  >>> _parse_host('example.com:56789/path')
  'http://example.com:56789/path'
  >>> _parse_host('https://example.com:56789/path')
  'https://example.com:56789/path'
  >>> _parse_host('example.com:56789/path/')
  'http://example.com:56789/path'

[bplunkert]

thanks @mxyng I've added your suggestions to the pull request.

[mxyng]

Awesome thanks!