examples: Add a client example to quickstart (#3752)

* new server API

* update server code

* add server test

* format

* format2

* better error messages for server

* miscellaneous test fixes

* add context test and better tests for everything

* Update tests/e2e/bento_server_http/tests/test_serve.py

Co-authored-by: Aaron Pham <29749331+aarnphm@users.noreply.github.com>

* examples: Add a client example to quickstart

* Update client.py

* Update client.py

* Fix style.

---------

Co-authored-by: Sauyon Lee <git@sjle.co>
Co-authored-by: Sauyon Lee <2347889+sauyon@users.noreply.github.com>
Co-authored-by: Aaron Pham <29749331+aarnphm@users.noreply.github.com>

examples/quickstart/client.py

@@ -0,0 +1,21 @@
+import logging
+
+import numpy as np
+
+from bentoml import HTTPServer
+from bentoml.client import Client
+
+logging.basicConfig(level=logging.WARN)
+
+if __name__ == "__main__":
+    server = HTTPServer("iris_classifier:latest", production=True, port=3000)
+
+    # Start the server in a separate process and connect to it using a client
+    with server.start() as client:
+        res = client.classify(np.array([[4.9, 3.0, 1.4, 0.2]]))
+        print(f"Successfully received results, {res}")
+
+        # Alternatively, you can use Client.from_url to connect to an already running server
+        client = Client.from_url("http://localhost:3000")
+        res = client.classify(np.array([[4.9, 3.0, 1.4, 0.2]]))
+        print(f"Successfully received results, {res}")