diff --git a/g4f/Provider/needs_auth/OpenaiChat.py b/g4f/Provider/needs_auth/OpenaiChat.py
index 29e3d4b4..38b97022 100644
--- a/g4f/Provider/needs_auth/OpenaiChat.py
+++ b/g4f/Provider/needs_auth/OpenaiChat.py
@@ -412,7 +412,7 @@ class OpenaiChat(AsyncGeneratorProvider, ProviderModelMixin):
                 if "proofofwork" in chat_requirements:
                     proofofwork = generate_proof_token(
                         **chat_requirements["proofofwork"],
-                        user_agent=cls._headers["user-agent"],
+                        user_agent=cls._headers.get("user-agent"),
                         proof_token=RequestConfig.proof_token
                     )
                 [debug.log(text) for text in (
@@ -439,15 +439,15 @@ class OpenaiChat(AsyncGeneratorProvider, ProviderModelMixin):
                     messages = messages if conversation_id is None else [messages[-1]]
                     data["messages"] = cls.create_messages(messages, image_request)
                 headers = {
-                    "Accept": "text/event-stream",
-                    "Content-Type": "application/json",
-                    "Openai-Sentinel-Chat-Requirements-Token": chat_token,
-                    **cls._headers
+                    **cls._headers,
+                    "accept": "text/event-stream",
+                    "content-type": "application/json",
+                    "openai-sentinel-chat-requirements-token": chat_token,
                 }
                 if RequestConfig.arkose_token:
-                    headers["Openai-Sentinel-Arkose-Token"] = RequestConfig.arkose_token
+                    headers["openai-sentinel-arkose-token"] = RequestConfig.arkose_token
                 if proofofwork is not None:
-                    headers["Openai-Sentinel-Proof-Token"] = proofofwork
+                    headers["openai-sentinel-proof-token"] = proofofwork
                 if need_turnstile and RequestConfig.turnstile_token is not None:
                     headers['openai-sentinel-turnstile-token'] = RequestConfig.turnstile_token
                 async with session.post(
diff --git a/g4f/Provider/openai/har_file.py b/g4f/Provider/openai/har_file.py
index d731bf73..2c7c1604 100644
--- a/g4f/Provider/openai/har_file.py
+++ b/g4f/Provider/openai/har_file.py
@@ -63,26 +63,28 @@ def readHAR():
                 continue
             for v in harFile['log']['entries']:
                 v_headers = get_headers(v)
-                try:
-                    if "openai-sentinel-proof-token" in v_headers:
-                        RequestConfig.proof_token = json.loads(base64.b64decode(
-                            v_headers["openai-sentinel-proof-token"].split("gAAAAAB", 1)[-1].encode()
-                        ).decode())
-                    if "openai-sentinel-turnstile-token" in v_headers:
-                        RequestConfig.turnstile_token = v_headers["openai-sentinel-turnstile-token"]
-                except Exception as e:
-                    debug.log(f"Read proof token: {e}")
                 if arkose_url == v['request']['url']:
                     RequestConfig.arkose_request = parseHAREntry(v)
-                elif v['request']['url'] == start_url or v['request']['url'].startswith(conversation_url):
+                elif v['request']['url'].startswith(start_url):
                     try:
                         match = re.search(r'"accessToken":"(.*?)"', v["response"]["content"]["text"])
                         if match:
                             RequestConfig.access_token = match.group(1)
                     except KeyError:
-                        continue
-                    RequestConfig.cookies = {c['name']: c['value'] for c in v['request']['cookies']}
-                    RequestConfig.headers = v_headers
+                        pass
+                    try:
+                        if "openai-sentinel-proof-token" in v_headers:
+                            RequestConfig.headers = v_headers
+                            RequestConfig.proof_token = json.loads(base64.b64decode(
+                                v_headers["openai-sentinel-proof-token"].split("gAAAAAB", 1)[-1].encode()
+                            ).decode())
+                        if "openai-sentinel-turnstile-token" in v_headers:
+                            RequestConfig.turnstile_token = v_headers["openai-sentinel-turnstile-token"]
+                        if "authorization" in v_headers:
+                            RequestConfig.access_token = v_headers["authorization"].split(" ")[1]
+                        RequestConfig.cookies = {c['name']: c['value'] for c in v['request']['cookies']}
+                    except Exception as e:
+                        debug.log(f"Error on read headers: {e}")
     if RequestConfig.proof_token is None:
         raise NoValidHarFileError("No proof_token found in .har files")