POST request fails with io.Reader reuse in Fiber framework **Description**

[francescobianco]

POST request fails with io.Reader reuse in Fiber framework

Description
When using Fiber, reusing request body causes empty payload in SDK call.

Code snippet

app.Post("/proxy", func(c *fiber.Ctx) error {
    buf := bytes.NewBuffer(c.Body())

    _, err := apiClient.Request(c.Context(), "POST", baseURL, "/endpoint", buf, nil)
    return err
})

Observed behavior
API receives empty body.