Python CGI: How to redirect to another page after processing POST data

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I\'m trying to write a Python script, in pyscripts/find_match.py that will process data received from a POST in an upload.php page, send it to connect.php and then redirect to a

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无人共我

2021-01-25 22:54
I wish people didn't keep trying to write CGI in 2014.

To redirect in a plain CGI application, you just need to output the destination next to a "Location:" header. However, you have already closed the headers and printed a blank HTML document at the top of your script. Don't do that: it's not only wrong for the redirection, it's also wrong for your alternative path, the form error, since you have already closed the HTML tags.

Instead, start your script like this:
```
# No printing at the start!
import cgi
...

try:
    form = cgi.FieldStorage()
    fn = form.getvalue('picture_name')
    cat_id = form.getvalue('selected')
except KeyError:
    print "Content-type: text/html"
    print
    print "<html><body>error</body></html>"
else:
    ...
    if response.status == 200:
        print "Location: response.php"
```
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梦如初夏

2021-01-25 22:58
1) Where is the shebang? (#!/usr/bin/env python)

2) print 'error' is a problem. cgi scripts stdout is the browser, the word 'error' will be problematic.

3) chmod 755 the script

I throw more redirects than webpages, here is the function I use.
```
def togo(location):
    print "HTTP/1.1 302 Found"
    print "Location: ",location,"\r\n"
    print "Connection: close \r\n"
    print ""
```
I don't know if that last print statement is needed, and the Connection close header seems to be optional to most clients, but I leave it because it is supposed to be in there, I think. RFC reading tends to put me right to sleep.

When I first write cgi scripts, I don't use cgi.FieldStorage, I hardcode the values so I can test it on the command line, after I get that working, I try it in a browser with the hard coded values, when that's working I add in the cgi.FieldStorage.

Check out
```
import cgitb
cgitb.enable()
```
I know it can be aggravating, I've been there. Good luck.
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