[Python-checkins] cpython: asyncio doc: add an client example using streams
victor.stinner
python-checkins at python.org
Thu Jan 23 11:25:57 CET 2014
http://hg.python.org/cpython/rev/8fe59931b64d
changeset: 88652:8fe59931b64d
user: Victor Stinner <victor.stinner at gmail.com>
date: Thu Jan 23 11:25:48 2014 +0100
summary:
asyncio doc: add an client example using streams
files:
Doc/library/asyncio-stream.rst | 35 ++++++++++++++++++++++
1 files changed, 35 insertions(+), 0 deletions(-)
diff --git a/Doc/library/asyncio-stream.rst b/Doc/library/asyncio-stream.rst
--- a/Doc/library/asyncio-stream.rst
+++ b/Doc/library/asyncio-stream.rst
@@ -205,3 +205,38 @@
XXX
+
+Example
+=======
+
+Simple example querying HTTP headers of the URL passed on the command line::
+
+ import asyncio
+ import urllib.parse
+ import sys
+
+ @asyncio.coroutine
+ def print_http_headers(url):
+ url = urllib.parse.urlsplit(url)
+ reader, writer = yield from asyncio.open_connection(url.hostname, 80)
+ query = ('HEAD {url.path} HTTP/1.0\r\n'
+ 'Host: {url.hostname}\r\n'
+ '\r\n').format(url=url)
+ writer.write(query.encode('latin-1'))
+ while True:
+ line = yield from reader.readline()
+ if not line:
+ break
+ line = line.decode('latin1').rstrip()
+ if line:
+ print('HTTP header> %s' % line)
+
+ url = sys.argv[1]
+ loop = asyncio.get_event_loop()
+ task = asyncio.async(print_http_headers(url))
+ loop.run_until_complete(task)
+
+Usage::
+
+ python example.py http://example.com/path/page.html
+
--
Repository URL: http://hg.python.org/cpython
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