Re: POST from a CGI
From: Michael Foord (fuzzyman_at_gmail.com)
Date: 09/23/04
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Date: 22 Sep 2004 15:25:36 -0700
Sorry to top post... but it looks like my problem may be with the
latest version of ClientCookie rather than with the principles of what
I'm doing...
Fuzzy
fuzzyman@gmail.com (Michael Foord) wrote in message news:<6f402501.0409220027.65be4885@posting.google.com>...
> I'm receiving POST data to a CGI, which I'd like to forward to another
> CGI using urllib2.
>
> I have two options -
>
> 1) Parse the data using cgi.FieldStorage() and then rebuild the POST
> request into a dictionary - including any files (? uploading files by
> urllib2 untested and undocumented - examples seem to be for httplib).
>
> 2) Read the whole POST data in using sys.stdin.read(), rebuild the
> 'Content-type' and 'Content-length' headers and make the POST.
>
> Obviously (2) is a *lot* less fiddly and less error prone. *But* I'm
> getting 400 errors when I try it (server thinks request is malformed).
> I've checked the headers and the body data and they seem normal and I
> can't work it out.
>
> I wonder if anyone can see what I'm doing wrong......
> (Simple code shown first - then a straightforward example that ought
> to work and fails).
>
> MAXUPLOAD = 10000 # set
> max file size of 10 000 bytes
> txdata = None
> if os.environ.get('REQUEST_METHOD','').lower()=='post': # read
> in the POST data from stdin
> txdata = sys.stdin.read(MAXUPLOAD)
> if len(txdata)==MAXUPLOAD and sys.stdin.read(1):
> print overmax
> sys.exit(1) #
> print an error message if too big a file is uploaded
>
>
> envdict = { 'HTTP_CACHE_CONTROL' : 'Cache-control', 'CONTENT_TYPE' :
> 'Content-type',
> 'HTTP_ACCEPT_LANGUAGE' : 'Accept-language', 'HTTP_ACCEPT'
> : 'Accept',
> 'HTTP_PRAGMA' : 'Pragma', 'HTTP_CONNECTION' :
> 'Connection',
> } #
> these are request headers from the browser to the CGI
> # that
> we're going to rebuild from the environment variables
> defaultuseragent = 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)'
> # default User-agent
> txheaders = {}
> for envvar, header in envdict.items(): # go through
> the environment variables putting any headers back
> testval = os.environ.get(envvar)
> if testval:
> txheaders[header] = testval
> txheaders['User-agent'] = os.environ.get('HTTP_USER_AGENT',
> defaultuseragent) # put in a default user agent if we haven't got
> one
> if txdata and txheaders.has_key('Content-type'):
> txheaders['Content-length'] = str(len(txdata)) # we only need a
> 'Content-length' header if we have a 'Content-type' one...
>
> theurl = 'http://www.someserver.com/somepath/somepage.html' #
> In actual fact I normally decode the url from the PATH_INFO
>
> req = urllib2.Request(theurl, txdata, txheaders) # create the
> request object
> try:
> u = urllib2.urlopen(req) # fetch a handle on the url !
> except IOError, e:
> if not hasattr(e,'code'):
> thecode = 0
> else:
> thecode = e.code
> print 'Content-type: text/html'
> print '<HTML><BODY><H1>Error Code %s</H1></BODY></HTML>' % e.code
>
> info = u.info() # info about the url
> pagetype = info.gettype()
> print 'Content-type: ' + pagetype + '\n'
> print u.read() # print the received page
>
> ###############################################################
>
> In the code I actually use I make a logfile as well which logs txdata,
> txheaders and all the environment variables.
>
> Making a simple post to my guestbook (
> http://www.voidspace.xennos.com/cgi-bin/guestbook.py ) using this
> method I get a 400 error.
> From the log I can see the following headers :
> (printed using headername, ' : ', value)
>
> Connection : keep-alive
> Accept-language : en-gb
> Pragma : no-cache
> Cache-control : max-age=259200
> Content-type : application/x-www-form-urlencoded
> Content-length : 62
> Accept : image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,
> application/x-shockwave-flash, application/msword, */*
> User-agent : Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)
>
>
> And the following POST data :
> name=Fuzzyman&email=&homepage=&location=&comment=CGI+post+test
>
> Which even has a length of 62.... The only thing I can think of is
> that the headers are appearing in the wrong order ?
> Can anyone else see what I'm doing wrong ?
>
> Regards,
>
>
> Fuzzy
> http://www.voidspace.org.uk/atlantibots/pythonutils.html
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