Unable to use headers in chat ollama

[ronneldavis]

Checked other resources

• I added a very descriptive title to this issue.
• I searched the LangChain.js documentation with the integrated search.
• I used the GitHub search to find a similar question and didn't find it.
• I am sure that this is a bug in LangChain.js rather than my code.
• The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

Example Code

import { ChatOllama } from "@langchain/ollama";
let model = new ChatOllama({
      baseUrl: "some-url",
      model: model,
      temperature: 0.1,
      numCtx: 16384,
      keepAlive: "60m",
      headers: {

      }
});

Error Message and Stack Trace (if applicable)

No response

Description

I am trying to set headers in chat ollama, I see that it had been fixed for the community library but since splitting out chat ollama, I don't see the option to set custom headers anymore.

Relevant links:

• Custom headers for Ollama / ChatOllama #4465
• community[patch]: Allow custom headers on Ollama / ChatOllama / OllamaEmbeddings  #4466

System Info

"langchain": "^0.2.11",
"@langchain/anthropic": "^0.2.13",
"@langchain/core": "0.2.22",
"@langchain/google-genai": "^0.0.25",
"@langchain/google-vertexai": "^0.0.21",
"@langchain/groq": "^0.0.16",
"@langchain/langgraph": "^0.0.33",
"@langchain/ollama": "^0.0.4",
"@langchain/openai": "^0.2.6"

[dosubot]

I found some similar issues that might help you:

1. Currently, it is not possible to pass headers when creating a RemoteRunnable - This issue is closed, and the solution is now documented here ^[1].

2. Custom headers for Ollama / ChatOllama - This issue was closed by a pull request that allows custom headers on Ollama / ChatOllama / OllamaEmbeddings ^[2].

To set custom headers in ChatOllama using LangChain.js, you can follow the approach shown below. The OllamaCallOptions interface supports a headers property where you can specify your custom headers.

Here is an example:

import { ChatOllama } from "@langchain/ollama";

const model = new ChatOllama({
  model: "your-model-name",
  maxTokens: 1024,
  clientOptions: {
    headers: {
      "X-Api-Key": process.env.OLLAMA_API_KEY,
      "Custom-Header": "YourCustomHeaderValue",
    },
  },
});

const res = await model.invoke("Your query here");

console.log(res);

In this code snippet, replace "your-model-name" with the actual model name you are using and add any custom headers you need in the headers object. This will ensure that your custom headers are included in the requests made by the ChatOllama instance ^[3][4].

To continue talking to Dosu, mention @dosu.

[bracesproul]

It appears the Ollama SDK doesn't have support for passing headers through to the requests. I've sent a message to the Ollama team asking about the best way to go about this, and will update you when I hear back.

[ronneldavis]

Thanks @bracesproul! Looking forward to hearing back from you 👍🏼

[ronneldavis]

@bracesproul I have been able to create a PR for ollama js that adds optional headers: ollama/ollama-js#138

[sdorra]

@bracesproul the pr is now merged and the version v0.5.9 includes the change.