Set LitServer.stream using LitSpec.stream (#398)

* set stream using method

* fix

src/litserve/server.py

@@ -43,7 +43,6 @@
 from litserve.loops import LitLoop, get_default_loop, inference_worker
 from litserve.middlewares import MaxSizeMiddleware, RequestCountMiddleware
 from litserve.python_client import client_template
-from litserve.specs import OpenAISpec
 from litserve.specs.base import LitSpec
 from litserve.utils import LitAPIStatus, WorkerSetupStatus, call_after_stream
 
@@ -146,8 +145,8 @@ def __init__(
             raise ValueError("batch_timeout must be less than timeout")
         if max_batch_size <= 0:
             raise ValueError("max_batch_size must be greater than 0")
-        if isinstance(spec, OpenAISpec):
-            stream = True
+        if isinstance(spec, LitSpec):
+            stream = spec.stream
 
         if loop is None:
             loop = "auto"

src/litserve/specs/base.py

@@ -26,6 +26,10 @@ def __init__(self):
 
         self._server: LitServer = None
 
+    @property
+    def stream(self):
+        return False
+
     def pre_setup(self, lit_api: "LitAPI"):
         pass
 

src/litserve/specs/openai.py

@@ -262,6 +262,10 @@ def __init__(
         self.add_endpoint("/v1/chat/completions", self.chat_completion, ["POST"])
         self.add_endpoint("/v1/chat/completions", self.options_chat_completions, ["OPTIONS"])
 
+    @property
+    def stream(self):
+        return True
+
     def pre_setup(self, lit_api: "LitAPI"):
         from litserve import LitAPI