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main.py

@@ -1248,6 +1248,35 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
+from fastapi.exceptions import RequestValidationError
+from fastapi.responses import JSONResponse
+from fastapi.encoders import jsonable_encoder
+
+@app.exception_handler(RequestValidationError)
+async def validation_exception_handler(request: Request, exc: RequestValidationError):
+    """
+    Handle validation errors gracefully, stripping binary/unsafe data from logs/response.
+    Fixes UnicodeDecodeError when multipart/form-data is sent to JSON endpoint.
+    """
+    errors = exc.errors()
+    clean_errors = []
+    for error in errors:
+        copy = error.copy()
+        # Remove raw binary input which causes jsonable_encoder crash
+        if 'input' in copy:
+            val = copy['input']
+            if isinstance(val, (bytes, bytearray)):
+                copy['input'] = "<binary_data_stripped>"
+            elif isinstance(val, str) and len(val) > 200:
+                copy['input'] = val[:200] + "..." # Truncate long inputs
+        clean_errors.append(copy)
+        
+    logger.warning(f"Validation Error on {request.url.path}: {clean_errors}")
+    return JSONResponse(
+        status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+        content={"detail": jsonable_encoder(clean_errors)},
+    )
+
 @app.middleware("http")
 async def limit_concurrency(request: Request, call_next):
     """Limit concurrent requests to MAX_CONCURRENT_USERS."""