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Fix issue3709 - BaseHTTPRequestHandler will buffer the headers and write only on end_headers call.

This commit is contained in:
Senthil Kumaran 2010-11-21 14:36:14 +00:00
parent a73dc9d5e8
commit e4dad4f8e2
4 changed files with 68 additions and 9 deletions
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21
Doc/library/http.server.rst
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@ -182,22 +182,29 @@ of which this module provides three different variants:
.. method:: send_header(keyword, value)
Writes a specific HTTP header to the output stream. *keyword* should
specify the header keyword, with *value* specifying its value.
Stores the HTTP header to an internal buffer which will be written to the
output stream when :meth:`end_headers` method is invoked.
*keyword* should specify the header keyword, with *value*
specifying its value.
.. versionchanged:: 3.2 Storing the headers in an internal buffer
.. method:: send_response_only(code, message=None)
Sends the reponse header only, used for the purposes when ``100
Continue`` response is sent by the server to the client. If the *message*
is not specified, the HTTP message corresponding the response *code* is
sent.
Continue`` response is sent by the server to the client. The headers not
buffered and sent directly the output stream.If the *message* is not
specified, the HTTP message corresponding the response *code* is sent.
.. versionadded:: 3.2
.. method:: end_headers()
Sends a blank line, indicating the end of the HTTP headers in the
response.
Write the buffered HTTP headers to the output stream and send a blank
line, indicating the end of the HTTP headers in the response.
.. versionchanged:: 3.2 Writing the buffered headers to the output stream.
.. method:: log_request(code='-', size='-')

9
Lib/http/server.py
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@ -443,7 +443,10 @@ class BaseHTTPRequestHandler(socketserver.StreamRequestHandler):
def send_header(self, keyword, value):
"""Send a MIME header."""
if self.request_version != 'HTTP/0.9':
self.wfile.write(("%s: %s\r\n" % (keyword, value)).encode('ASCII', 'strict'))
if not hasattr(self, '_headers_buffer'):
self._headers_buffer = []
self._headers_buffer.append(
("%s: %s\r\n" % (keyword, value)).encode('ASCII', 'strict'))
if keyword.lower() == 'connection':
if value.lower() == 'close':
@ -454,7 +457,9 @@ class BaseHTTPRequestHandler(socketserver.StreamRequestHandler):
def end_headers(self):
"""Send the blank line ending the MIME headers."""
if self.request_version != 'HTTP/0.9':
self.wfile.write(b"\r\n")
self._headers_buffer.append(b"\r\n")
self.wfile.write(b"".join(self._headers_buffer))
self._headers_buffer = []
def log_request(self, code='-', size='-'):
"""Log an accepted request.

43
Lib/test/test_httpservers.py
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@ -511,6 +511,49 @@ class BaseHTTPRequestHandlerTestCase(unittest.TestCase):
self.verify_get_called()
self.assertEqual(result[-1], b'<html><body>Data</body></html>\r\n')
def test_header_buffering(self):
def _readAndReseek(f):
pos = f.tell()
f.seek(0)
data = f.read()
f.seek(pos)
return data
input = BytesIO(b'GET / HTTP/1.1\r\n\r\n')
output = BytesIO()
self.handler.rfile = input
self.handler.wfile = output
self.handler.request_version = 'HTTP/1.1'
self.handler.send_header('Foo', 'foo')
self.handler.send_header('bar', 'bar')
self.assertEqual(_readAndReseek(output), b'')
self.handler.end_headers()
self.assertEqual(_readAndReseek(output),
b'Foo: foo\r\nbar: bar\r\n\r\n')
def test_header_unbuffered_when_continue(self):
def _readAndReseek(f):
pos = f.tell()
f.seek(0)
data = f.read()
f.seek(pos)
return data
input = BytesIO(b'GET / HTTP/1.1\r\nExpect: 100-continue\r\n\r\n')
output = BytesIO()
self.handler.rfile = input
self.handler.wfile = output
self.handler.request_version = 'HTTP/1.1'
self.handler.handle_one_request()
self.assertNotEqual(_readAndReseek(output), b'')
result = _readAndReseek(output).split(b'\r\n')
self.assertEqual(result[0], b'HTTP/1.1 100 Continue')
self.assertEqual(result[1], b'HTTP/1.1 200 OK')
def test_with_continue_rejected(self):
usual_handler = self.handler # Save to avoid breaking any subsequent tests.
self.handler = RejectingSocketlessRequestHandler()

4
Misc/NEWS
View File

@ -32,6 +32,10 @@ Core and Builtins
Library
-------
- Issue #3709: BaseHTTPRequestHandler will buffer the headers and write to
output stream only when end_headers is invoked. This is a speedup and an
internal optimization. Patch by endian.
- Issue #10220: Added inspect.getgeneratorstate. Initial patch by
Rodolpho Eckhardt.