[serve] Remove start_server flag (#8620)

python/ray/serve/api.py

@@ -62,7 +62,6 @@ def accept_batch(f):
 
 def init(cluster_name=None,
          blocking=False,
-         start_server=True,
          http_host=DEFAULT_HTTP_HOST,
          http_port=DEFAULT_HTTP_PORT,
          ray_init_kwargs={
@@ -84,8 +83,6 @@ def init(cluster_name=None,
             specified in all subsequent serve.init() calls.
         blocking (bool): If true, the function will wait for the HTTP server to
             be healthy, and other components to be ready before returns.
-        start_server (bool): If true, `serve.init` starts http server.
-            (Default: True)
         http_host (str): Host for HTTP server. Default to "0.0.0.0".
         http_port (int): Port for HTTP server. Default to 8000.
         ray_init_kwargs (dict): Argument passed to ray.init, if there is no ray
@@ -126,10 +123,9 @@ def init(cluster_name=None,
     master_actor = ServeMaster.options(
         name=master_actor_name,
         max_restarts=-1,
-    ).remote(cluster_name, start_server, http_node_id, http_host, http_port,
-             metric_exporter)
+    ).remote(cluster_name, http_node_id, http_host, http_port, metric_exporter)
 
-    if start_server and blocking:
+    if blocking:
         block_until_http_ready("http://{}:{}/-/routes".format(
             http_host, http_port))