adapt ForwardProxyURL to use the NetworkProxyRaw

Signed-off-by: Mohammed Al Sahaf <msaa1990@gmail.com>

caddytest/integration/caddyfile_adapt/reverse_proxy_http_transport_forward_proxy_url.txt

@@ -0,0 +1,41 @@
+:8884
+reverse_proxy 127.0.0.1:65535 {
+	transport http {
+		forward_proxy_url http://localhost:8080
+	}
+}
+----------
+{
+	"apps": {
+		"http": {
+			"servers": {
+				"srv0": {
+					"listen": [
+						":8884"
+					],
+					"routes": [
+						{
+							"handle": [
+								{
+									"handler": "reverse_proxy",
+									"transport": {
+										"network_proxy": {
+											"from": "url",
+											"url": "http://localhost:8080"
+										},
+										"protocol": "http"
+									},
+									"upstreams": [
+										{
+											"dial": "127.0.0.1:65535"
+										}
+									]
+								}
+							]
+						}
+					]
+				}
+			}
+		}
+	}
+}

modules/caddyhttp/reverseproxy/caddyfile.go

@@ -33,6 +33,7 @@ import (
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp/headers"
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp/rewrite"
 	"github.com/caddyserver/caddy/v2/modules/caddytls"
+	"github.com/caddyserver/caddy/v2/modules/internal/network"
 )
 
 func init() {
@@ -1078,8 +1079,8 @@ func (h *HTTPTransport) UnmarshalCaddyfile(d *caddyfile.Dispenser) error {
 			if !d.NextArg() {
 				return d.ArgErr()
 			}
-
+			u := network.ProxyFromURL{URL: d.Val()}
-			h.ForwardProxyURL = d.Val()
+			h.NetworkProxyRaw = caddyconfig.JSONModuleObject(u, "from", "url", nil)
 
 		case "network_proxy":
 			if !d.NextArg() {

modules/caddyhttp/reverseproxy/httptransport.go

@@ -24,7 +24,6 @@ import (
 	weakrand "math/rand"
 	"net"
 	"net/http"
-	"net/url"
 	"os"
 	"reflect"
 	"strings"
@@ -36,8 +35,10 @@ import (
 	"golang.org/x/net/http2"
 
 	"github.com/caddyserver/caddy/v2"
+	"github.com/caddyserver/caddy/v2/caddyconfig"
 	"github.com/caddyserver/caddy/v2/modules/caddyhttp"
 	"github.com/caddyserver/caddy/v2/modules/caddytls"
+	"github.com/caddyserver/caddy/v2/modules/internal/network"
 )
 
 func init() {
@@ -344,6 +345,11 @@ func (h *HTTPTransport) NewTransport(caddyCtx caddy.Context) (*http.Transport, e
 
 	// negotiate any HTTP/SOCKS proxy for the HTTP transport
 	proxy := http.ProxyFromEnvironment
+	if h.ForwardProxyURL != "" {
+		caddyCtx.Logger().Warn("forward_proxy_url is deprecated; use network_proxy instead")
+		u := network.ProxyFromURL{URL: h.ForwardProxyURL}
+		h.NetworkProxyRaw = caddyconfig.JSONModuleObject(u, "from", "url", nil)
+	}
 	if len(h.NetworkProxyRaw) != 0 {
 		proxyMod, err := caddyCtx.LoadModule(h, "ForwardProxyRaw")
 		if err != nil {
@@ -356,16 +362,6 @@ func (h *HTTPTransport) NewTransport(caddyCtx caddy.Context) (*http.Transport, e
 		}
 	}
 
-	if h.ForwardProxyURL != "" {
-		caddyCtx.Logger().Warn("forward_proxy_url is deprecated; use network_proxy instead")
-		pUrl, err := url.Parse(h.ForwardProxyURL)
-		if err != nil {
-			return nil, fmt.Errorf("failed to parse transport proxy url: %v", err)
-		}
-		caddyCtx.Logger().Info("setting transport proxy url", zap.String("url", h.ForwardProxyURL))
-		proxy = http.ProxyURL(pUrl)
-	}
-
 	rt := &http.Transport{
 		Proxy:                  proxy,
 		DialContext:            dialContext,