support for ollama api keys

[theoden8]

Feature request

Please, support api keys for ollama.

Motivation

Ollama is not compatible with openai API, e.g. /v1/models. It is possible to hide ollama instance behind pre-determined api keys.

Your contribution

I believe this is the part where this feature would be implemented: https://github.com/davidmigloz/langchain_dart/blob/main/packages/langchain_ollama/lib/src/chat_models/chat_ollama.dart#L148. The api key is passed as Bearer token in request header.

[davidmigloz]

Hello @theoden8,

You can provide any custom header using theheaders field:

final chat = ChatOllama(
  baseUrl: 'https://your-base-url.com/api',
  headers: { 'api-key': 'YOUR_API_KEY' },
  defaultOptions: ChatOllamaOptions(
    model: 'llama3',
    temperature: 0,
  ),
);