From c9395c7ed1e1af7f288e50415d03dcf421c15fd5 Mon Sep 17 00:00:00 2001
From: Artur Signell <artur@vaadin.com>
Date: Thu, 28 Mar 2019 16:38:22 +0200
Subject: [PATCH] Make exported web components work on hosts where https is
 proxied to http

---
 .../server/communication/WebComponentBootstrapHandler.java     | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/flow-server/src/main/java/com/vaadin/flow/server/communication/WebComponentBootstrapHandler.java b/flow-server/src/main/java/com/vaadin/flow/server/communication/WebComponentBootstrapHandler.java
index 47a9434fc06..795183aa8c3 100644
--- a/flow-server/src/main/java/com/vaadin/flow/server/communication/WebComponentBootstrapHandler.java
+++ b/flow-server/src/main/java/com/vaadin/flow/server/communication/WebComponentBootstrapHandler.java
@@ -64,6 +64,9 @@ protected BootstrapContext createAndInitUI(Class<? extends UI> uiClass,
         // remove path prefix but keep the trailing slash
         String serviceUrl = requestURL.substring(0,
                 requestURL.length() - PATH_PREFIX.length() + 1);
+        // replace http:// or https:// with // to work with https:// proxies which proxies to the same http:// url
+        serviceUrl = serviceUrl.replaceFirst("^.*://", "//");
+
         assert serviceUrl.endsWith("/");
         config.put(ApplicationConstants.SERVICE_URL, serviceUrl);
         return context;