fix: if on macOS use uvicorn

langflow/backend/langflow_backend/__main__.py

@@ -8,16 +8,10 @@ import typer
 from fastapi.staticfiles import StaticFiles
 from pathlib import Path
 
-from langflow_backend.server import LangflowApplication
-
 
 def get_number_of_workers(workers=None):
     if workers is None:
-        workers = (
-            int(os.environ.get("OBJC_DISABLE_INITIALIZE_FORK_SAFETY", "0") == "YES")
-            if platform.system() == "Darwin"
-            else 1
-        )
+        workers = 1
     elif workers == -1:
         workers = (multiprocessing.cpu_count() * 2) + 1
     return workers
@@ -40,14 +34,24 @@ def serve(
     if not timeout:
         timeout = 60
 
+    host = "127.0.0.1"
+    port = 5003
     options = {
-        "bind": "127.0.0.1:5003",
+        "bind": f"{host}:{port}",
         "workers": get_number_of_workers(workers),
         "worker_class": "uvicorn.workers.UvicornWorker",
         "timeout": timeout,
     }
 
-    LangflowApplication(app, options).run()
+    if platform.system() == "Darwin":
+        # Run using uvicorn on MacOS
+        import uvicorn
+
+        uvicorn.run(app, host=host, port=port, log_level="info")
+    else:
+        from langflow_backend.server import LangflowApplication
+
+        LangflowApplication(app, options).run()
 
 
 def main():