shithub: hugo

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Add liveReloadPort flag to server

This makes live reloading behind a HTTPS proxy working, as in the example below using the service from https://ngrok.com:

```
hugo server -b https://ba6sdfe72.ngrok.io --appendPort=false --liveReloadPort=443 --navigateToChanged
```

Fixes #3882

--- a/commands/server.go

+++ b/commands/server.go

@@ -38,6 +38,7 @@

 	serverAppend      bool

 	serverInterface   string

 	serverPort        int

+	liveReloadPort    int

 	serverWatch       bool

 	noHTTPCache       bool

 )

@@ -85,6 +86,7 @@

 	initHugoBuilderFlags(serverCmd)

 	serverCmd.Flags().IntVarP(&serverPort, "port", "p", 1313, "port on which the server will listen")

+	serverCmd.Flags().IntVar(&liveReloadPort, "liveReloadPort", -1, "port for live reloading (i.e. 443 in HTTPS proxy situations)")

 	serverCmd.Flags().StringVarP(&serverInterface, "bind", "", "127.0.0.1", "interface to which the server will bind")

 	serverCmd.Flags().BoolVarP(&serverWatch, "watch", "w", true, "watch filesystem for changes and recreate as needed")

 	serverCmd.Flags().BoolVar(&noHTTPCache, "noHTTPCache", false, "prevent HTTP caching")

@@ -144,6 +146,11 @@

 	}

 	c.Set("port", serverPort)

+	if liveReloadPort != -1 {

+		c.Set("liveReloadPort", liveReloadPort)

+	} else {

+		c.Set("liveReloadPort", serverPort)

+	}

 	baseURL, err = fixURL(c.Cfg, baseURL)

 	if err != nil {

--- a/hugolib/site.go

+++ b/hugolib/site.go

@@ -1845,7 +1845,7 @@

 		}

 		if s.running() && s.Cfg.GetBool("watch") && !s.Cfg.GetBool("disableLiveReload") {

-			transformLinks = append(transformLinks, transform.LiveReloadInject(s.Cfg.GetInt("port")))

+			transformLinks = append(transformLinks, transform.LiveReloadInject(s.Cfg.GetInt("liveReloadPort")))

 		}

 		// For performance reasons we only inject the Hugo generator tag on the home page.