Development store Proxy app CORS problem

Shopify Partner
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I'm unable to use my development store Shopify proxy app when creating requests from my storefront code(hosted in Netlify) or from Postman - it gets CORS error. When I go directly to my proxy link, it works fine.

Access to XMLHttpRequest at '' from origin '' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
CartItems.client.tsx:34 Error ========> U {message: 'Network Error', name: 'AxiosError', code: 'ERR_NETWORK', config: {…}, request: XMLHttpRequest, …}
xhr.js:220 GET net::ERR_FAILED 302

Is it related somehow to development store password protection or pw page, which is not returning correct header?
Is there a workaround for development stores, for example add store password somewhere into request and bypass that check?

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