In the HTTP model, technically status code 102 Processing would fit best. Though, no longer part of the HTTP specification. https://http.dev/102 https://http.d

In the HTTP model, technically status code 102 Processing would fit best. Though, no longer part of the HTTP specification. https://http.dev/102 https://http.dev/102 100 Continue could be usable as a workaround. Would probably require at a bare minimum some extra integration code on the client side.