wsgiserver: implement parse_headers

adafruit_esp32spi/adafruit_esp32spi_wsgiserver.py

@@ -31,7 +31,6 @@
 import io
 import gc
 from micropython import const
-from adafruit_requests import parse_headers
 import adafruit_esp32spi.adafruit_esp32spi_socket as socket
 
 _the_interface = None  # pylint: disable=invalid-name
@@ -46,6 +45,22 @@ def set_interface(iface):
 
 NO_SOCK_AVAIL = const(255)
 
+
+def parse_headers(client):
+    """
+    Parses the header portion of an HTTP request from the socket.
+    Expects first line of HTTP request to have been read already.
+    """
+    headers = {}
+    while True:
+        line = str(client.readline(), "utf-8")
+        if not line:
+            break
+        title, content = line.split(":", 1)
+        headers[title.strip().lower()] = content.strip()
+    return headers
+
+
 # pylint: disable=invalid-name
 class WSGIServer:
     """
@@ -99,7 +114,7 @@ def finish_response(self, result):
         :param string result: the data string to send back in the response to the client.
         """
         try:
-            response = "HTTP/1.1 {0}\r\n".format(self._response_status)
+            response = "HTTP/1.1 {0}\r\n".format(self._response_status or "500 ISE")
             for header in self._response_headers:
                 response += "{0}: {1}\r\n".format(*header)
             response += "\r\n"
@@ -159,7 +174,10 @@ def _start_response(self, status, response_headers):
             ex ("header-name", "header value")
         """
         self._response_status = status
-        self._response_headers = [("Server", "esp32WSGIServer")] + response_headers
+        self._response_headers = [
+            ("Server", "esp32WSGIServer"),
+            ("Connection", "close"),
+        ] + response_headers
 
     def _get_environ(self, client):
         """