Make sure openid discovery uses correct URLs when accessed behind proxy

Author: plexus

dev/log4j2.json

@@ -11,7 +11,7 @@
     },
     "loggers": {
       "logger": [
-        {"name": "io.helidon", "level": "info"},
+        {"name": "org.eclipse.jetty", "level": "info"},
         {"name": "io.methvin.watcher", "level": "info"},
         {"name": "org.eclipse.aether", "level": "info"},
         {"name": "org.apache.http", "level": "info"},

resources/log4j2.json

@@ -13,7 +13,7 @@
     },
     "loggers": {
       "logger": [
-        {"name": "io.helidon", "level": "info"}
+        {"name": "org.eclipse.jetty", "level": "info"}
       ],
       "root": {
         "level": "info",

src/co/gaiwan/oak/util/routing.clj

@@ -5,9 +5,12 @@
 
 (defn base-url [req]
   (let [{:keys [headers authority scheme host]} req
-        host (or (get headers "host") ;; HTTP 1.1
-                 authority)] ;; HTTP 2.0
-    (str (name scheme) "://" host)))
+        scheme (or (get headers "X-Forwarded-Proto") ;; behind proxy
+                   (name scheme))
+        host (or (get headers "X-Forwarded-Host")    ;; behind proxy
+                 (get headers "host")                ;; HTTP 1.1
+                 authority)]                         ;; HTTP 2.0
+    (str scheme "://" host)))
 
 (defn path-for
   ([req name]