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From Kumar Devarakonda <>
Subject [users@httpd] Apache server response very very slow from chrome/ firefox and works fine from Safari - User-Agent issue
Date Tue, 18 Jul 2017 07:14:01 GMT

We have a strange issue recently with Apache. When we request some webpages
(running on apache web server) from our server, if we make the request from
Safari, they are loaded instantly. If we load the web page from Chrome or
Firefox, it takes approximately 10 minutes to get the response. The same
behavior is observed with curl too. After much research, we found that if
the User-Agent header has "Mozilla" String in it, the requests are taking
time. Response time is normal with below command curl -i -v -H "User-Agent:
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:51.0)" curl -i
-v -H "User-Agent: Gecko/20100101"

Response time is very slow (approximately 3 to 10 minutes): curl -i -v -H
"User-Agent: Gecko/20100101 Firefox/51.0" curl -i -v -H
"User-Agent: Firefox/51.0"

We have not upgraded anything recently. But this issue popped up suddenly.
Any pointers to resolve the issue will help. Thank you in advance.

It is the same results (same kind of slowness) for all kinds of resources
(that can be compressed). We have tried multiple things like adding
compress/ gzip header/ removing it etc.. Still the same. It just worked
fine if we remove user-agent "Mozilla" string. We have multiple
applications running through this server and all of them behaved the same
way (same kind of slowness)..



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