go fmt

Proxy servers can set the X-Forwarded-Host and X-Forwarded-Proto headers to pass on the original host and protocol.
We should also support the Forwarded header (which combines this in one header described in RFC7239 - but seems echo does not support parsing that one?)

lnme.go

@@ -152,8 +152,13 @@ func main() {
 	if !cfg.Bool("disable-ln-address") {
 		lnurlHandler := func(c echo.Context) error {
 			host := c.Request().Host
-			if c.Request().Header.Get(echo.HeaderXForwardedFor) != "" {
-				host = c.Request().Header.Get(echo.HeaderXForwardedFor)
+			proto := c.Scheme()
+			// TODO: support RFC7239 Forwarded header
+			if c.Request().Header.Get("X-Forwarded-Host") != "" {
+				host = c.Request().Header.Get("X-Forwarded-Host")
+			}
+			if c.Request().Header.Get("X-Forwarded-Proto") != "" {
+				proto = c.Request().Header.Get("X-Forwarded-Proto")
 			}
 			name := c.Param("name")
 			lightningAddress := name + "@" + host
@@ -162,7 +167,7 @@ func main() {
 			if amount := c.QueryParam("amount"); amount == "" {
 				lnurlPayResponse1 := lnurl.LNURLPayResponse1{
 					LNURLResponse:   lnurl.LNURLResponse{Status: "OK"},
-					Callback:        fmt.Sprintf("%s://%s%s", c.Scheme(), host, c.Request().URL.Path),
+					Callback:        fmt.Sprintf("%s://%s%s", proto, host, c.Request().URL.Path),
 					MinSendable:     1000,
 					MaxSendable:     100000000,
 					EncodedMetadata: lnurlMetadata,