I've created a page that will take css (or javascript) files and output them as one file. I have noticed that Firefox and Internet Explorer will both fail to send the "If-Modified-Since" header at any time when I compress the output using ob_gzhandler:
if(!ob_start("ob_gzhandler")) ob_start();
The initial headers (Host and referrer changed in sample):
Response Headers
Cache-Control public, must-revalidate, maxage=4838400
Connection keep-alive
Content-Encoding gzip
Content-Length 87281
Content-Type text/css; charset: UTF-8
Date Wed, 12 Dec 2012 16:04:32 GMT
Expires Wed, 06 Feb 2013 16:04:32 GMT
Last-Modified Fri, 12 Oct 2012 13:47:18 GMT
Pragma public
Server Apache
Vary Accept-Encoding
X-Cache MISS from localhost
X-Powered-By PHP/5.3.13
Request Headers
Accept text/css,*/*;q=0.1
Accept-Encoding gzip, deflate
Accept-Language en-gb,en;q=0.5
Authorization Basic cmVkZnVzZTpyM2RmdXMz
Cache-Control no-cache
Connection keep-alive
Cookie PHPSESSID=e73355c49f06a059c22d7f02687dc51b
DNT 1
Host example.com
Pragma no-cache
Referer http://example.com/
User-Agent Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20100101 Firefox/17.0
And the following headers are sent on refresh (Host and referrer changed in sample):
Response Headers
Cache-Control public, must-revalidate, maxage=4838400
Connection keep-alive
Content-Encoding gzip
Content-Length 87245
Content-Type text/css; charset: UTF-8
Date Wed, 12 Dec 2012 16:09:11 GMT
Expires Wed, 06 Feb 2013 16:09:11 GMT
Last-Modified Fri, 12 Oct 2012 13:47:18 GMT
Pragma public
Server Apache
Vary Accept-Encoding
X-Cache MISS from localhost
X-Powered-By PHP/5.3.13
Request Headers
Accept text/css,*/*;q=0.1
Accept-Encoding gzip, deflate
Accept-Language en-gb,en;q=0.5
Authorization Basic cmVkZnVzZTpyM2RmdXMz
Cache-Control max-age=0
Connection keep-alive
Cookie PHPSESSID=e73355c49f06a059c22d7f02687dc51b
DNT 1
Host example.com
Referer example.com
User-Agent Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20100101 Firefox/17.0
If I switch from using ob_gzhandler to a standard ob_start() then it works fine and returns a 304 as expected on the second load.
Another issue that I think is related is that when viewing from an android device, the css doesn't get applied for either the stock browser or for Dolphin Browser, but is fine for Firefox for Android. This is also resolved by disabling the ob_gzhandler
Related
When I browse to a page with Firefox and click a download link, the following headers are shown when I inspect the request in network inspector:
Connection: keep-alive
Content-Disposition: attachment; filename="example_file.mp3"
Content-Length: 35181829
Content-Transfer-Encoding: binary
Content-Type: audio/mpeg
Date: Fri, 19 Aug 2016 18:19:02 GMT
Keep-Alive: timeout=60
Server: nginx
X-Powered-By: PHP/5.4.45
However, when I use cURL to visit the same address, I get this:
Connection: keep-alive
Content-Length: 1918
Content-Type: text/html; charset=UTF-8
Date: Fri, 19 Aug 2016 20:46:23 GMT
Keep-Alive: timeout=60
Server: nginx
X-Powered-By: PHP/5.4.45
How can I form a request with cURL that gives me the same response as Firefox?
In Firefox, open up the Net tab in the developer options(F12) and open the URL of the page you need.
Take note of all the Request Headers in the request sent to the server:
Example:
Accept
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding
gzip, deflate
Accept-Language
nl,en-US;q=0.7,en;q=0.3
Connection
keep-alive
Cookie
_ga=GA1.2.598213448.1471644637; _gat=1
Host
mariannesdelights.be
User-Agent
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0
Put all the headers in an array in this way
$headers = array('HeaderName:HeaderValue','HeaderName2:HeaderValue2');
Use the php function curl_setoption() to set the headers in the request:
curl_setopt($ch,CURLOPT_HTTPHEADER,$headers);
That should produce the exact same HTTP-Response headers.
When I browse to a page with Firefox and click a download link, the following headers are shown when I inspect the request in network inspector:
Connection: keep-alive
Content-Disposition: attachment; filename="example_file.mp3"
Content-Length: 35181829
Content-Transfer-Encoding: binary
Content-Type: audio/mpeg
Date: Fri, 19 Aug 2016 18:19:02 GMT
Keep-Alive: timeout=60
Server: nginx
X-Powered-By: PHP/5.4.45
However, when I use cURL to visit the same address, I get this:
Connection: keep-alive
Content-Length: 1918
Content-Type: text/html; charset=UTF-8
Date: Fri, 19 Aug 2016 20:46:23 GMT
Keep-Alive: timeout=60
Server: nginx
X-Powered-By: PHP/5.4.45
How can I form a request with cURL that gives me the same response as Firefox?
In Firefox, open up the Net tab in the developer options(F12) and open the URL of the page you need.
Take note of all the Request Headers in the request sent to the server:
Example:
Accept
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding
gzip, deflate
Accept-Language
nl,en-US;q=0.7,en;q=0.3
Connection
keep-alive
Cookie
_ga=GA1.2.598213448.1471644637; _gat=1
Host
mariannesdelights.be
User-Agent
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0
Put all the headers in an array in this way
$headers = array('HeaderName:HeaderValue','HeaderName2:HeaderValue2');
Use the php function curl_setoption() to set the headers in the request:
curl_setopt($ch,CURLOPT_HTTPHEADER,$headers);
That should produce the exact same HTTP-Response headers.
I need the browser to cache a large, mostly static .php file. I open it via ajax and want to add it to the current page.
After some research if found this
$seconds_to_cache = 3600;
$ts = gmdate("D, d M Y H:i:s", time() + $seconds_to_cache) . " GMT";
header("Expires: $ts");
header("Pragma: cache");
header("Cache-Control: max-age=$seconds_to_cache");
This works for IE, but not for chrome and firefox.
Here is the request
Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding gzip, deflate
Accept-Language de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
Cache-Control max-age=0
Connection keep-alive
Content-Type application/x-www-form-urlencoded
Cookie PHPSESSID=5dkvr42f4it8pnnnqpesj6l413
Host localhost
Referer http://localhost/mifa/Suche.php
User-Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0.1
charset utf-8
and here the response header
Cache-Control max-age=3600
Connection Keep-Alive
Content-Type text/html
Date Thu, 05 Jul 2012 15:28:22 GMT
Expires Thu, 05 Jul 2012 16:28:22 GMT
Keep-Alive timeout=5, max=91
Pragma cache
Server Apache/2.2.21 (Win32) mod_ssl/2.2.21 OpenSSL/1.0.0e PHP/5.3.8 mod_perl/2.0.4 Perl/v5.10.1
Transfer-Encoding chunked
X-Powered-By PHP/5.3.8
What do i need to change?
EDIT
Apparently, only IE does not append the Cache-Control max-age=0 to the request.
Here is the JS Function of the request
url = "includes/Orte.php";
obj.onreadystatechange = rState;
obj.open("GET", url, true);
obj.setRequestHeader("Pragma", "");
obj.setRequestHeader("Cache-Control", "");
obj.setRequestHeader("charset", "utf-8");
obj.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
obj.setRequestHeader("Connection", "close");
obj.send();
function rState(){
if(obj.readyState == 4){
if (obj.status == 200){
//alert("Response Text Ajax:\n" + obj.responseText + "\nEnd Response Text");
}
}
}
The Cache-Control: max-age=0 header in the request means that you asked your browser to refresh the page, so he just ignores the cache.
Access the page without hitting refresh (e.g. focus the address bar and hit enter) to avoid this.
Also, if the page is on an HTTPS URL, you may have to add public to the Cache-Control header, else some browsers won't cache it.
Two things that come to mind are the last modified header, and using .htaccess cache control. The latter is for broad types but you can use it just for one folder, with that file in a folder by itself.
header("Last-Modified: ... ");
Firebug shows a request which causes a huge delay to
http://reboltutorial.com/wp-content/themes/minaflow/none
Details below but I don't understand why it says it comes from xmlrpc and the stylesheet:
Date Sun, 04 Apr 2010 16:10:02 GMT
Server Apache
X-Powered-By PHP/5.2.13
X-Pingback http://reboltutorial.com/xmlrpc.php
Expires Wed, 11 Jan 1984 05:00:00 GMT
Cache-Control no-cache, must-revalidate, max-age=0
Pragma no-cache
Set-Cookie wordpress_test_cookie=WP+Cookie+check; path=/; domain=.reboltutorial.com
Last-Modified Sun, 04 Apr 2010 16:10:03 GMT
Vary Accept-Encoding
Content-Encoding gzip
Keep-Alive timeout=2, max=94
Connection Keep-Alive
Transfer-Encoding chunked
Content-Type text/html; charset=UTF-8
Requêtemise en page impression
GET /wp-content/themes/minaflow/none HTTP/1.1
Host: reboltutorial.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; fr; rv:1.9.2) Gecko/20100115 Firefox/3.6
Accept: image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language: fr,fr-fr;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Connection: keep-alive
Referer: http://reboltutorial.com/wp-content/themes/minaflow/style.css
1) Please remove SESSION_ID and all cookies from post (it's quote easy for hacker to access to your site with that)
2) In CSS you have 3 times next code:
background: url(none);
That's why it goes to 404 error!
My Browser isn't sending back an If-Modified-Since Header for PHP generated Content
on the first request my script sends:
(Status-Line) HTTP/1.1 200 OK
Date Thu, 21 Jan 2010 08:55:25 GMT
Server Apache/2.2.11 (Win32) PHP/5.2.9-1
X-Powered-By PHP/5.2.9-1
Pragma no-cache
x-ua-compatible IE=8;FF=3;OtherUA=4
Last-Modfied Sat, 02 Jan 2010 02:02:20 GMT
Content-Length 28453
Etag b98e0795b509be20146f58e06fbb624f
Keep-Alive timeout=5, max=90
Connection Keep-Alive
Content-Type image/png
it on the second request it sends:
(Request-Line) GET /kincumberunitingchurch/banner_image.php?id=1 HTTP/1.1
Host localhost
User-Agent Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.0.17) Gecko/2009122116 Firefox/3.0.17
Accept image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language en-us,en;q=0.5
Accept-Encoding gzip,deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive 300
Connection keep-alive
Referer http://localhost/kincumberunitingchurch/index.php?sid=tgl9jq3f71nau3cj9vps6pna03
Cookie sid=tgl9jq3f71nau3cj9vps6pna03; PHPSESSID=m0jvven6d7l65pl6odm9ecfnt4
If-None-Match b98e0795b509be20146f58e06fbb624f
Cache-Control max-age=0
for other files the sever sends first:
(Status-Line) HTTP/1.1 200 OK
Date Thu, 21 Jan 2010 08:55:25 GMT
Server Apache/2.2.11 (Win32) PHP/5.2.9-1
Last-Modified Wed, 30 Dec 2009 02:40:58 GMT
Etag "1000000013d35-40d9-47be9117f6280"
Accept-Ranges bytes
Content-Length 16601
Keep-Alive timeout=5, max=84
Connection Keep-Alive
Content-Type image/png
and my browser send the following on the next request:
(Request-Line) GET /kincumberunitingchurch/img/cbuttons.png HTTP/1.1
Host localhost
User-Agent Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.0.17) Gecko/2009122116 Firefox/3.0.17
Accept image/png,image/*;q=0.8,*/*;q=0.5
Accept-Language en-us,en;q=0.5
Accept-Encoding gzip,deflate
Accept-Charset ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive 300
Connection keep-alive
Referer http://localhost/kincumberunitingchurch/mystyle.css
Cookie sid=tgl9jq3f71nau3cj9vps6pna03; PHPSESSID=m0jvven6d7l65pl6odm9ecfnt4
If-Modified-Since Wed, 30 Dec 2009 02:40:58 GMT
If-None-Match "1000000013d35-40d9-47be9117f6280"
Cache-Control max-age=0
why would it send the If-Modified-Since header
Your first sended header reads "Last-Modfied", which is a typo (the first 'i' in Modified is missing).
can you look if the Last-Modfied inside the first example isn't a typo at the server side