add streaming-server with web client (#164)

* add streaming-server with web client

* small fixes

python-api-examples/web/start-https-server.py

@@ -0,0 +1,75 @@
+#!/usr/bin/env python3
+
+# Code in this file is modified from
+# https://stackoverflow.com/questions/19705785/python-3-simple-https-server
+
+import argparse
+import http.server
+import ssl
+import sys
+from pathlib import Path
+
+"""
+Usage:
+
+  ./start-https-server.py \
+    --server-address 0.0.0.0 \
+    --server-port 6007 \
+    --cert ./cert.pem
+"""
+
+
+def get_args():
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "--server-address",
+        type=str,
+        default="0.0.0.0",
+        help="""IP address which this server will bind to""",
+    )
+
+    parser.add_argument(
+        "--server-port",
+        type=int,
+        default=6007,
+        help="""Port number on which this server will listen""",
+    )
+
+    parser.add_argument(
+        "--certificate",
+        type=str,
+        default="cert.pem",
+        help="""Path to the X.509 certificate. You can use
+        ./generate-certificate.py to generate it""",
+    )
+
+    return parser.parse_args()
+
+
+def main():
+    args = get_args()
+    print(f"{vars(args)}")
+    server_address = (args.server_address, args.server_port)
+    httpd = http.server.HTTPServer(
+        server_address, http.server.SimpleHTTPRequestHandler
+    )
+
+    if not Path(args.certificate).is_file():
+        print("Please run ./generate-certificate.py to generate a certificate")
+        sys.exit(-1)
+
+    httpd.socket = ssl.wrap_socket(
+        httpd.socket,
+        server_side=True,
+        certfile=args.certificate,
+        ssl_version=ssl.PROTOCOL_TLS,
+    )
+    print(
+        "The server is listening at the following address:\n"
+        f"https://{args.server_address}:{args.server_port}"
+    )
+    httpd.serve_forever()
+
+
+if __name__ == "__main__":
+    main()