Golang - Proxy route to another backend

route.go

// Original post: https://github.com/gin-gonic/gin/issues/686#issuecomment-240619920

router.POST("/api/v1/endpoint1", ReverseProxy())

func ReverseProxy() gin.HandlerFunc {
  target := "localhost:3000"

  return func(c *gin.Context) {
    director := func(req *http.Request) {
      r := c.Request
      req = r
      req.URL.Scheme = "http"
      req.URL.Host = target
      req.Header["my-header"] = []string{r.Header.Get("my-header")}
      // Golang camelcases headers
      delete(req.Header, "My-Header")
    }
    
    proxy := &httputil.ReverseProxy{Director: director}
    proxy.ServeHTTP(c.Writer, c.Request)
  }
}