"Utilizing jQuery, Ajax, and the powerful REDIRECT_QUERY_STRING feature

Recently, I decided to revamp a small website consisting of three or four pages using a minimalist MVC framework (which might be excessive, but I wanted to experiment).

The site is configured with an .htaccess file:

RewriteEngine on  
RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.*$ - [NC,L]
#allow various filetypes
RewriteRule !\.(js|ico|gif|jpg|png|css)$ index.php [NC,L]

This setup allows me to process the URL through a router. However, when attempting to send an Ajax request (using jQuery), I noticed that a query string was added to the URL (printed from PHP):

['key'] =>'2?_=1282088000558'
//desired outcome:
['key]=>'2'

Upon inspecting the $_SERVER array, I found that the value was stored as REDIRECT_QUERY_STRING.

It appears that this issue only occurs when JavaScript is enabled. Does anyone have any suggestions on how to tackle this problem? Should I prevent jQuery from adding this value, or should I handle it in JavaScript?

phpjqueryajaxquery-string

Answer №1

It is included to ensure that the browser does not cache the request, utilizing a timestamp to obtain a fresh response from the server. This action is taken solely for the benefit of the browser:

url + _= + (new Date()).getTime();

You can observe jQuery incorporating this feature here: 

if ( s.cache === false && type === "GET" ) {
  var ts = jQuery.now();

  // attempt to substitute _= if present
  var ret = s.url.replace(rts, "$1_=" + ts + "$2");

  // add timestamp to the end if no replacement was made
  s.url = ret + ((ret === s.url) ? (rquery.test(s.url) ? "&" : "?") + "_=" + ts : "");
}

If desired, you can remove it by setting cache: true in the $.ajax() options or using $.ajaxSetup() in this manner:

$.ajaxSetup({ cache: true });

Answer №2

By incorporating a unique element into the query string, jQuery is preventing the browser/server cache from being accessed during requests.

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