1 files changed, 8 insertions, 10 deletions

diff --git a/g4f/Provider/GeminiPro.py b/g4f/Provider/GeminiPro.py
index 1c5487b1..a22304d5 100644
--- a/g4f/Provider/GeminiPro.py
+++ b/g4f/Provider/GeminiPro.py
@@ -26,38 +26,35 @@ class GeminiPro(AsyncGeneratorProvider, ProviderModelMixin):
         stream: bool = False,
         proxy: str = None,
         api_key: str = None,
-        api_base: str = None,
-        use_auth_header: bool = True,
+        api_base: str = "https://generativelanguage.googleapis.com/v1beta",
+        use_auth_header: bool = False,
         image: ImageType = None,
         connector: BaseConnector = None,
         **kwargs
     ) -> AsyncResult:
-        model = "gemini-pro-vision" if not model and image else model
+        model = "gemini-pro-vision" if model is None and image is not None else model
         model = cls.get_model(model)
 
         if not api_key:
             raise MissingAuthError('Missing "api_key"')
 
         headers = params = None
-        if api_base and use_auth_header:
+        if use_auth_header:
             headers = {"Authorization": f"Bearer {api_key}"}
         else:
             params = {"key": api_key}
 
-        if not api_base:
-            api_base = f"https://generativelanguage.googleapis.com/v1beta"
-
         method = "streamGenerateContent" if stream else "generateContent"
         url = f"{api_base.rstrip('/')}/models/{model}:{method}"
         async with ClientSession(headers=headers, connector=get_connector(connector, proxy)) as session:
             contents = [
                 {
-                    "role": "model" if message["role"] == "assistant" else message["role"],
+                    "role": "model" if message["role"] == "assistant" else "user",
                     "parts": [{"text": message["content"]}]
                 }
                 for message in messages
             ]
-            if image:
+            if image is not None:
                 image = to_bytes(image)
                 contents[-1]["parts"].append({
                     "inline_data": {
@@ -87,7 +84,8 @@ class GeminiPro(AsyncGeneratorProvider, ProviderModelMixin):
                             lines = [b"{\n"]
                         elif chunk == b",\r\n" or chunk == b"]":
                             try:
-                                data = json.loads(b"".join(lines))
+                                data = b"".join(lines)
+                                data = json.loads(data)
                                 yield data["candidates"][0]["content"]["parts"][0]["text"]
                             except:
                                 data = data.decode() if isinstance(data, bytes) else data