print output to webpage as soon as the print statement is executed in Python CGI script

Question

I want to print the output on webpage as soon as the print statement is executed. Here is my code:

#!/usr/bin/python2.7
import sys, time    
sys.stdout.write('Content-Type: text/html\n')
sys.stdout.write('\n\n')
print "<html><body>"
print "hi"
sys.stdout.flush()
for i in range(10):
    print '<div>%i</div>'%i
    sys.stdout.flush()
    time.sleep(1)
print "</body></html>"

But I see all output at once only after full script is executed. Am I missing anything?

See stackoverflow.com/questions/1645308/… for more information. (It uses Perl, but the underlying principles still apply.) — John Gordon
– John Gordon, Commented Nov 29, 2016 at 21:17
I am still unable to resolve the issue, sys.stdout.flush doesn't seem to be working in my case, it will be great if someone can suggest any other solutions? — user5154816
– user5154816, Commented Dec 2, 2016 at 21:38
I think the problem is that your browser waits until it gets all the output before displaying anything. — John Gordon
– John Gordon, Commented Dec 2, 2016 at 21:45
I tried in all 3, firefox, chrome and IE, but in none of them, it worked. Not sure what can be the solution. — user5154816
– user5154816, Commented Dec 2, 2016 at 21:54

MD Mushfirat Mohaimin · Accepted Answer · 2021-08-01 12:29:54Z

1

You may need to disable apache compression that requires to buffer the whole content before sending it to the browser.

Try to add this in the /etc/apache2 configuraton file:

<Directory /var/www/your_web_site_here>
    SetEnv no-gzip 1
</Directory>

edited Aug 1, 2021 at 12:29

MD Mushfirat Mohaimin

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answered Aug 1, 2021 at 8:59

A. Pace

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