fix(tracker): fix fetch proxy headers check

tracker/tracker/CHANGELOG.md

@@ -1,3 +1,7 @@
+# 9.0.5
+
+- same fixes but for fetch proxy
+
 # 9.0.2 & 9.0.3 & 9.0.4
 
 - fixes for "setSessionTokenHeader" method

tracker/tracker/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@openreplay/tracker",
   "description": "The OpenReplay tracker main package",
-  "version": "9.0.4",
+  "version": "9.0.5",
   "keywords": [
     "logging",
     "replay"

tracker/tracker/src/main/modules/Network/fetchProxy.ts

@@ -147,14 +147,16 @@ export class FetchProxyHandler<T extends typeof fetch> implements ProxyHandler<T
       if (argsList[1] === undefined && argsList[0] instanceof Request) {
         return argsList[0].headers.append(name, value)
       } else {
+        if (!argsList[1]) argsList[1] = {}
         if (argsList[1].headers === undefined) {
-          argsList[1].headers = {}
+          argsList[1] = { ...argsList[1], headers: {} }
         }
         if (argsList[1].headers instanceof Headers) {
           argsList[1].headers.append(name, value)
         } else if (Array.isArray(argsList[1].headers)) {
           argsList[1].headers.push([name, value])
         } else {
+          // @ts-ignore
           argsList[1].headers[name] = value
         }
       }