Refactor Copilot provider to improve authentication handling and streamline media uploads; add error handling for user retrieval. Enhance QwenCode provider to manage token validation and refresh logic. Update backend API to include new error handling for model and provider not found scenarios. Add start-browser script for automated Chrome launch.

g4f/gui/server/backend_api.py

@@ -31,7 +31,7 @@ try:
 except ImportError as e:
     has_markitdown = False
 try:
-    from .crypto import rsa, serialization, create_or_read_keys, decrypt_data, encrypt_data, get_session_key
+    from .crypto import serialization, create_or_read_keys, decrypt_data, encrypt_data, get_session_key
     has_crypto = True
 except ImportError:
     has_crypto = False
@@ -42,7 +42,7 @@ from ...providers.response import FinishReason, AudioResponse, MediaResponse, Re
 from ...client.helper import filter_markdown
 from ...tools.files import supports_filename, get_streaming, get_bucket_dir, get_tempfile
 from ...tools.run_tools import iter_run_tools
-from ...errors import ProviderNotFoundError, MissingAuthError
+from ...errors import ModelNotFoundError, ProviderNotFoundError, MissingAuthError, RateLimitError
 from ...image import is_allowed_extension, process_image, MEDIA_TYPE_MAP
 from ...cookies import get_cookies_dir
 from ...image.copy_images import secure_filename, get_source_url, get_media_dir, copy_media
@@ -368,6 +368,12 @@ class Backend_Api(Api):
                     response = response if isinstance(response, str) else "".join(response)
                     return Response(filter_markdown(response, None if is_true_filter else do_filter, response if is_true_filter else ""), mimetype='text/plain')
                 return Response(response, mimetype='text/plain')
+            except (ModelNotFoundError, ProviderNotFoundError) as e:
+                return jsonify({"error": {"message": f"{type(e).__name__}: {e}"}}), 404
+            except MissingAuthError as e:
+                return jsonify({"error": {"message": f"{type(e).__name__}: {e}"}}), 401
+            except RateLimitError as e:
+                return jsonify({"error": {"message": f"{type(e).__name__}: {e}"}}), 429
             except Exception as e:
                 logger.exception(e)
                 return jsonify({"error": {"message": f"{type(e).__name__}: {e}"}}), 500