How to set a cookie on a redirect in python?

@drew 

To set a cookie on a redirect in Python, you can use the set_cookie method of the HTTPRedirectHandler class in the urllib module. Here's an example:

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import urllib.request

# Create a subclass of HTTPRedirectHandler
class MyRedirectHandler(urllib.request.HTTPRedirectHandler):
    def http_error_302(self, req, fp, code, msg, headers):
        # Set your cookie in the headers
        headers['Set-Cookie'] = 'your_cookie_name=your_cookie_value'

        # Return the modified headers to perform the redirect with the cookie
        return urllib.request.HTTPRedirectHandler.http_error_302(self, req, fp, code, msg, headers)

# Install the custom redirect handler
opener = urllib.request.build_opener(MyRedirectHandler())
urllib.request.install_opener(opener)

# Perform the redirect request
response = urllib.request.urlopen('http://example.com/redirect')

# Print the response headers
print(response.headers)

In this example, the MyRedirectHandler class is a subclass of HTTPRedirectHandler that overrides the http_error_302 method. Within this method, you can modify the response headers to include the cookie you want to set using the Set-Cookie header. The build_opener function creates a new opener with the custom redirect handler, and the install_opener function installs it as the default opener for all urllib requests.

When you perform the redirect request using urlopen, the custom redirect handler will be triggered for redirects with a status code of 302 (Found). The handler modifies the headers to include the cookie and then returns the modified headers to perform the redirect with the cookie.

Finally, the response headers are printed to verify that the cookie was set correctly.