Issue Connecting to Langgraph Cloud API Server

[kihumban]

I previously hosted my Langgraph backend API locally using a Docker container, and everything worked as long as the container was running. The frontend was hosted on Vercel.

Recently, I migrated the backend API to Langgraph Cloud and redeployed the frontend on Vercel after removing the previous deployment. I updated the environment variable NEXT_PUBLIC_API_URL to point to the new cloud API server and modified the frontend code accordingly.

`export const createClient = () => {
const apiUrl = process.env.NEXT_PUBLIC_API_URL;
const apiKey = process.env.LANGSMITH_API_KEY;

return new Client({
apiUrl: apiUrl,
apiKey: apiKey
});
};`

However, the application is now failing to work, and I keep receiving error messages. The error log from the browser console is included below. It seems that the API requests are not including the necessary authentication information, even though I have provided the API key.

`Failed to load resource: the server responded with a status of 403 ()Understand this errorAI
hopeforum-3c3acab5702053c6bd3f6b4ba3dd4af5.us.langgraph.app/threads:1

       Failed to load resource: the server responded with a status of 403 ()Understand this errorAI

7864-89868cf8d113930b.js:1 Error creating thread HTTPError: HTTP 403: {"detail":"Missing authentication headers"}
at HTTPError.fromResponse (7933-37d17a5b62912814.js:256:24595)
at async 7933-37d17a5b62912814.js:256:25713
at async RetryOperation._fn (7933-37d17a5b62912814.js:204:6647)
(anonymous) @ 7864-89868cf8d113930b.js:1Understand this errorAI
7933-37d17a5b62912814.js:256 Uncaught (in promise) HTTPError: HTTP 403: {"detail":"Missing authentication headers"}
at HTTPError.fromResponse (7933-37d17a5b62912814.js:256:24595)
at async 7933-37d17a5b62912814.js:256:25713
at async RetryOperation._fn (7933-37d17a5b62912814.js:204:6647)`

Could you please advise on what additional authentication details or configuration might be required?

Thank you for your assistance.

[dasshims]

I am also getting -
"detail": "Missing authentication headers"
Do you know where do I get the x-api-key from?

[kihumban]

@dasshims Are you using Langgraph cloud server?

x-api-key is just a header variable whose value is your API key, in this case Langsmith API key, assuming you are connecting to Langgraph Cloud server. Normally something like this:

`headers = {
"Content-Type": "application/json",
"X-API-Key": api_key,

}`

[kihumban]

@dasshims did you manage to resolve this error? I have not managed to resolve it.

[dasshims]

The headers can be passed using defaultHeaders, unfortunately, headers didn't work for me.

I am creating a client like below -

return new Client({ apiUrl, apiKey: process.env.LANGCHAIN_API_KEY, defaultHeaders: { "x-api-key": "your langsmith api key", }, });