Python cgi.FieldStorage() is empty on form submission

StackOverflow https://stackoverflow.com/questions/23118256

  •  04-07-2023
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Question

I have the following directives in my Apache 2 virtual host configuration:

<Directory /var/www/foo_test>
  Options MultiViews +ExecCGI
  AddHandler cgi-script .py
  AllowOverride All 
</Directory>

I have the following simple form HTML:

<html>
  <body>
    <form action="foo.py" method="post" id="foo_form">
      <input type="text" id="foo" />
      <input type="submit" />
    </form>
  </body>
</html>

Here is foo.py, the executable script that is called when the form is submitted:

#!/usr/bin/env python

import cgi
arguments = cgi.FieldStorage()

print "Content-Type: text/html\n"
print repr(arguments)

When I submit the form, I get the following response:

FieldStorage(None, None, [])

There is nothing in the FieldStorage object instance that contains values for the fields specified in the form foo_form.

If I replace the Python script with a Perl script and its CGI module, along with changing the Apache directives to handle Perl CGIs, I have no problems reading fields out of the form. This suggests to me that my Apache setup is okay.

However, am I missing something with instantiating the cgi.FieldStorage() object, or with my Apache setup, that is causing the form submission to fail?

Was it helpful?

Solution

You need to give the input a name attribute if you want its data to be submitted in the form.

OTHER TIPS

It blew my mind, but this is what happened to me.

Apparently you cannot "pull" the information from cgi.FieldStorage more than once ?

Run from any console tab in a browser:

$.post('/api/save.cgi', {'hello': 'world'}, (response) => {
   console.log("DONE");
});

Python code in backend

#!/usr/bin/env python3

import cgi

fcgi = cgi.FieldStorage()
sys.stderr.write("try 1 %s \n" % fcgi)

fcgi = cgi.FieldStorage()
sys.stderr.write("try 2: %s \n" % fcgi)

See error log:

try 1: FieldStorage(None, None, [MiniFieldStorage('hello', 'world')])
try 2: FieldStorage(None, None, [])
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