disable rich exception output in console for API by default, use...

disable rich exception output in console for API by default, use WEBUI_RICH_EXCEPTIONS env var to enable

modules/api/api.py

 import base64
 import io
+import os
 import time
 import datetime
 import uvicorn
@@ -98,14 +99,16 @@ def encode_pil_to_base64(image):
 
 
 def api_middleware(app: FastAPI):
-    rich_available = True
+    rich_available = False
     try:
-        import anyio # importing just so it can be placed on silent list
-        import starlette # importing just so it can be placed on silent list
-        from rich.console import Console
-        console = Console()
+        if os.environ.get('WEBUI_RICH_EXCEPTIONS', None) is not None:
+            import anyio  # importing just so it can be placed on silent list
+            import starlette  # importing just so it can be placed on silent list
+            from rich.console import Console
+            console = Console()
+            rich_available = True
     except Exception:
-        rich_available = False
+        pass
 
     @app.middleware("http")
     async def log_and_time(req: Request, call_next):
@@ -116,14 +119,14 @@ def api_middleware(app: FastAPI):
         endpoint = req.scope.get('path', 'err')
         if shared.cmd_opts.api_log and endpoint.startswith('/sdapi'):
             print('API {t} {code} {prot}/{ver} {method} {endpoint} {cli} {duration}'.format(
-                t = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f"),
-                code = res.status_code,
-                ver = req.scope.get('http_version', '0.0'),
-                cli = req.scope.get('client', ('0:0.0.0', 0))[0],
-                prot = req.scope.get('scheme', 'err'),
-                method = req.scope.get('method', 'err'),
-                endpoint = endpoint,
-                duration = duration,
+                t=datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f"),
+                code=res.status_code,
+                ver=req.scope.get('http_version', '0.0'),
+                cli=req.scope.get('client', ('0:0.0.0', 0))[0],
+                prot=req.scope.get('scheme', 'err'),
+                method=req.scope.get('method', 'err'),
+                endpoint=endpoint,
+                duration=duration,
             ))
         return res
 
@@ -134,7 +137,7 @@ def api_middleware(app: FastAPI):
             "body": vars(e).get('body', ''),
             "errors": str(e),
         }
-        if not isinstance(e, HTTPException): # do not print backtrace on known httpexceptions
+        if not isinstance(e, HTTPException):  # do not print backtrace on known httpexceptions
             message = f"API error: {request.method}: {request.url} {err}"
             if rich_available:
                 print(message)