Feature Request: Expose `baseUrlOverride` on proxy/get/post/put/patch/delete methods in Node & TS SDK

[Gamatel]

Summary

Right now, the Nango Proxy REST API supports the Base-Url-Override header (see docs) to override the default base URL for proxied calls.
However, this override is not exposed as a first-class option in the SDKs (Node & TS), which means SDK users cannot configure a custom base API URL directly through the SDK method signatures.

For example, in the Node SDK (@nangohq/node) and the generated TS SDK (speakeasy-sdks/nango-typescript-sdk), methods such as:

• nango.proxy({...})
• nango.get({...})
• nango.post({...})
• nango.put({...})
• nango.patch({...})
• nango.delete({...})

do not expose a typed baseUrlOverride param to match the underlying API’s support for overriding proxy base URLs.

Problem

When integrating with APIs that are either:

• not defined in providers.yaml,
• or where the base URL must be dynamic (e.g., tenant-specific instance_url),
  the only current workaround is manually injecting the Base-Url-Override header. This is error-prone, lacks type support, and prevents ergonomic SDK use.

Proposal

Add a baseUrlOverride option in the proxy configuration for all relevant methods in:

1. The Node backend SDK (@nangohq/node)
2. The Typescript SDK (speakeasy-sdks/nango-typescript-sdk)

This should be added for:

• proxy method (nango.proxy({...}))
• HTTP request helpers (nango.get({...}), nango.post({...}), etc.)
• Any generated SDK clients that wrap proxy calls

The desired behavior is that SDK methods automatically set the Base-Url-Override header when baseUrlOverride is provided, reducing friction and making it explicit in the typing.

Benefits

• Better ergonomics and DX when using the proxy for custom/tenant-specific APIs
• Explicit SDK support aligns with the documented Proxy REST API behavior
• Avoids the need to manually hack headers or custom HTTP clients

Example Use Case

await nango.proxy({
  endpoint: '/v1/foo',
  providerConfigKey: 'my-provider',
  connectionId: 'conn-id',
  baseUrlOverride: 'https://api.custom.baz',
});

[linear]

NAN-4892