Updated handler config (#63)

vendor/github.com/labstack/echo/middleware/proxy_1_11.go

@@ -0,0 +1,25 @@
+// +build go1.11
+
+package middleware
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httputil"
+
+	"github.com/labstack/echo"
+)
+
+func proxyHTTP(tgt *ProxyTarget, c echo.Context, config ProxyConfig) http.Handler {
+	proxy := httputil.NewSingleHostReverseProxy(tgt.URL)
+	proxy.ErrorHandler = func(resp http.ResponseWriter, req *http.Request, err error) {
+		desc := tgt.URL.String()
+		if tgt.Name != "" {
+			desc = fmt.Sprintf("%s(%s)", tgt.Name, tgt.URL.String())
+		}
+		c.Logger().Errorf("remote %s unreachable, could not forward: %v", desc, err)
+		c.Error(echo.NewHTTPError(http.StatusServiceUnavailable))
+	}
+	proxy.Transport = config.Transport
+	return proxy
+}