I make apps for other people

. . . just 90% stupid.

Posted by Chris Jones
On January 8th, 2008 at 13:27

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Posted in Python

I figured out what I was doing wrong. Nothing except for how I chose to echo or display the XML.

Since it’s a dynamic call, I can’t view the page source to see the XML that gets returned. And I never verified that I was getting a String: I assumed that because it was inside a CDATA block that the tags would be visible, but what I actually got was the tags being evaluated, and since ^<get><time /></get> isn’t part of XHTML 1.1 . . . my XML never appeared.

So in the interest of saving some future developer a few minutes or hours or days of trouble, if you’re trying to parse POST-ed XMLHttpRequest XML DOM objects in a Python CGI web application and it looks like STDIN is empty or you’re not getting the POST contents, verify that you’re reading something by checking the length and extracting a part of the string. And convert your tags.

import os
import sys
def main():
    print "Content-Type: application/xml\n\n"
    print "< ![CDATA[
    for key in os.environ:
        print key + "=" + os.environ[key] + "
    if os.environ.has_key("CONTENT_LENGTH"):
        length = int(os.environ["CONTENT_LENGTH"])
        s = str(sys.stdin.read(length))
        s = s.replace('< ', '<')         print "

" + s + "";
    print "
if __name__ == '__main__':

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