examples/network: Split recv- and read-based HTTP servers.

Name recv() based a "simplistic", as it can't work robustly in every
environment. All this is to let people concentreate on proper, read()-
based one (and to turn recv() based into a "negative showcase",
explaining what are the pitfalls of such approach).

examples/network/http_server_simplistic.py

@@ -0,0 +1,38 @@
+try:
+    import usocket as socket
+except:
+    import socket
+
+
+CONTENT = b"""\
+HTTP/1.0 200 OK
+
+Hello #%d from MicroPython!
+"""
+
+def main():
+    s = socket.socket()
+    ai = socket.getaddrinfo("0.0.0.0", 8080)
+    addr = ai[0][-1]
+
+    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+
+    s.bind(addr)
+    s.listen(5)
+    print("Listening, connect your browser to http://<this_host>:8080/")
+
+    counter = 0
+    while True:
+        res = s.accept()
+        client_s = res[0]
+        client_addr = res[1]
+        req = client_s.recv(4096)
+        print("Request:")
+        print(req)
+        client_s.send(CONTENT % counter)
+        client_s.close()
+        counter += 1
+        print()
+
+
+main()