从cgi.FieldStorage检索完整的URL

Question

I'm passing a URL to a python script using cgi.FieldStorage() :

http://localhost/cgi-bin/test.py?file=http://localhost/test.xml

test.py just contains

#!/usr/bin/env python

import cgi
print "Access-Control-Allow-Origin: *"
print "Content-Type: text/plain; charset=x-user-defined"
print "Accept-Ranges: bytes"
print
print cgi.FieldStorage()

and the result is

FieldStorage(None, None, [MiniFieldStorage('file', 'http:/localhost/test.xml')])

Note that the URL only contains http:/localhost - how do I pass the full encoded URI so that file is the whole URI? I've tried encoding the file parameter ( http%3A%2F%2Flocalhost%2ftext.xml ) but this also doesn't work

The screenshot shows that the output to the webpage isn't what is expected, but that the encoded url is correct

Answer 1

Your CGI script works fine for me using Apache 2.4.10 and Firefox (curl also). What web server and browser are you using?

My guess is that you are using Python's CGIHTTPServer , or something based on it. This exhibits the problem that you identify. CGIHTTPServer assumes that it is being provided with a path to a CGI script so it collapses the path without regard to any query string that might be present. Collapsing the path removes duplicate forward slashes as well as relative path elements such as .. .

If you are using this web server I don't see any obvious way around by changing the URL. You won't be using it in production, so perhaps look at another web server such as Apache, nginx, lighttpd etc.

Answer 2

The problem is with your query parameters, you should be encoding them:

>>> from urllib import urlencode
>>> urlencode({'file': 'http://localhost/test.xml', 'other': 'this/has/forward/slashes'})
'other=this%2Fhas%2Fforward%2Fslashes&file=http%3A%2F%2Flocalhost%2Ftest.xml'