Function composeURL

backend/go/cloud-proxy/proxy.go:397–406

composeURL combines the configured upstream URL with the per-request path. The upstream URL typically already includes the canonical path (e.g. https://api.openai.com/v1/chat/completions) so the per-request path is ignored in that case. When upstream_url is a bare host (https://api.openai.com), the

(upstream, reqPath string)

// path is ignored in that case. When upstream_url is a bare host
// (https://api.openai.com), the request path is appended.
func composeURL(upstream, reqPath string) (string, error) {
	u, err := url.Parse(upstream)
	if err != nil {
		return "", fmt.Errorf("cloud-proxy: parse upstream_url %q: %w", upstream, err)
	}
	if u.Path == "" || u.Path == "/" {
		u.Path = reqPath
	}
	return u.String(), nil
}

// applyAuthHeader writes the appropriate authorization header for the
// provider. OpenAI/Anthropic/most providers use Bearer; Anthropic