add async http client

Author: michaelliao

py3/coroutine/async_wget.py

@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import asyncio
+
+@asyncio.coroutine
+def wget(host):
+    print('wget %s...' % host)
+    connect = asyncio.open_connection(host, 80)
+    reader, writer = yield from connect
+    header = 'GET / HTTP/1.0\r\nHost: %s\r\n\r\n' % host
+    writer.write(header.encode('utf-8'))
+    yield from writer.drain()
+    while True:
+        line = yield from reader.readline()
+        if line == b'\r\n':
+            break
+        print('%s header > %s' % (host, line.decode('utf-8').rstrip()))
+    # Ignore the body, close the socket
+    writer.close()
+
+loop = asyncio.get_event_loop()
+tasks = [asyncio.async(wget(host)) for host in ['www.sina.com.cn', 'www.sohu.com', 'www.163.com']]
+for task in tasks:
+    loop.run_until_complete(task)
+loop.close()