Merge pull request #6056 from Stoehr-Sauer/FIX_WebRequest_CustomRequestHeaders

Fix web request custom request headers

dist/preview release/what's new.md

@@ -232,6 +232,7 @@
 - PointerDragBehavior validateDrag predicate to stop dragging to specific points ([TrevorDev](https://github.com/TrevorDev))
 - Auto Update Touch Action [#5674](https://github.com/BabylonJS/Babylon.js/issues/5674)([Sebavan](https://github.com/Sebavan))
 - Add hemispheric lighting to gizmos to avoid flat look ([TrevorDev](https://github.com/TrevorDev))
+- Fix a bug causing `WebRequest.open` to crash if `WebRequest.CustomRequestHeaders` are set [#6055](https://github.com/BabylonJS/Babylon.js/issues/6055)([susares](https://github.com/susares))
 
 ### Viewer
 

src/Misc/webRequest.ts

@@ -112,6 +112,10 @@ export class WebRequest {
      * @param body defines an optional request body
      */
     public send(body?: Document | BodyInit | null): void {
+        if (WebRequest.CustomRequestHeaders) {
+            this._injectCustomRequestHeaders();
+        }
+
         this._xhr.send(body);
     }
 
@@ -121,10 +125,6 @@ export class WebRequest {
      * @param url defines the url to connect with
      */
     public open(method: string, url: string): void {
-        if (WebRequest.CustomRequestHeaders) {
-            this._injectCustomRequestHeaders();
-        }
-
         for (var update of WebRequest.CustomRequestModifiers) {
             update(this._xhr);
         }