[issue747320] rfc2822 formatdate functionality duplication

[karl]

karl added the comment:

http://tools.ietf.org/html/draft-ietf-httpbis-p2-semantics-22#section-7.1.1

quoting from HTTP 1.1 bis

   Prior to 1995, there were three different formats commonly used by
   servers to communicate timestamps.  For compatibility with old
   implementations, all three are defined here.  The preferred format is
   a fixed-length and single-zone subset of the date and time
   specification used by the Internet Message Format [RFC5322].

     HTTP-date    = IMF-fixdate / obs-date

   An example of the preferred format is

     Sun, 06 Nov 1994 08:49:37 GMT    ; IMF-fixdate

   Examples of the two obsolete formats are

     Sunday, 06-Nov-94 08:49:37 GMT   ; obsolete RFC 850 format
     Sun Nov  6 08:49:37 1994         ; ANSI C's asctime() format

   A recipient that parses a timestamp value in an HTTP header field
   MUST accept all three formats.  A sender MUST generate the IMF-
   fixdate format when sending an HTTP-date value in a header field.


What http.server.BaseHTTPRequestHandler.date_time_string is currently doing

>>> import time
>>> timestamp = time.time()
>>> weekdayname = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
>>> monthname = [None,'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun','Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
>>> year, month, day, hh, mm, ss, wd, y, z = time.gmtime(timestamp)
>>> s = "%s, %02d %3s %4d %02d:%02d:%02d GMT" % (weekdayname[wd],day, monthname[month], year,hh, mm, ss)
>>> s
'Mon, 25 Feb 2013 19:26:34 GMT'



what email.utils.formatdate is doing:

>>> import email.utils
>>> email.utils.formatdate(timeval=None,localtime=False, usegmt=True)
'Mon, 25 Feb 2013 19:40:04 GMT'
>>> import time
>>> ts = time.time()
>>> email.utils.formatdate(timeval=ts,localtime=False, usegmt=True)
'Mon, 25 Feb 2013 19:51:50 GMT'

I createad a patch 
s = email.utils.formatdate(timestamp, False, True)

I didn't touch the log method which has a different format which is anyway not compatible with email.utils.

----------
keywords: +patch
nosy: +karlcow
Added file: http://bugs.python.org/file29240/server.patch

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