Hi there! I was reading through the documentation, and it mentions that env vars are accessible inside the http provider However, when I try to use an env var as a url, it throws a zod error

errors: [
    {
      code: 'invalid_type',
      expected: 'string',
      received: 'object',
      path: [ 'url' ],
      message: 'Expected string, received object'
    }
  ]

Here's my provider:

yaml
providers:
  - id: https
    label: Base model
    config:
      url: {{ env.PROVIDER_URL }}
      maxRetries: 3
      method: POST
      headers:
        'Content-Type': 'application/json'
        'Authorization': 'Bearer {{ env.GOOGLE_ID_TOKEN }}'
      body:
        agent:
          query: '{{query}}'
      transformResponse: |
        {
          output: json.finalMessageContent,
          tokenUsage: {
            total: json.tokenUsage?.totalTokens || 0,
            prompt: json.tokenUsage?.inputTokens || 0,
            completion: json.tokenUsage?.outputTokens || 0,
            cached: json.tokenUsage?.cacheReadTokens || 0,
            numRequests: json.tokenUsage?.llmCalls || 0
          },
          cost: json.cost
        }

Does

'{{ env.PROVIDER_URL }}'

work?

Yep! It fixes that error, thank you!

You'll need to deserialize the response returned by the HTTP provider

I think I'm already doing that in the above example, or am I doing that wrong?

Ah, I'm sorry, totally missed that.

Oh sure thing thanks! I do appreciate that