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Who Add "_" Single Underscore Query Parameter?

Answer 1

+3 A:

Probably it's a dummy parameter added by the reverse proxy to force non-cached content to be served.

Artefacto 2010-09-10 19:34:27

Answer 2

+8 A:

jQuery adds a parameter like that to get around IE's caching.

edit: it only adds it for get requests, and only if the option cache is false:

cache: false

Patricia 2010-09-10 19:35:43

I do use jQuery but it doesn't appear in every request.

ZZ Coder 2010-09-10 19:51:22

jfrobishow 2010-09-10 19:54:44

I only have this one AJAX call on my page and I do set the nocache attribute. However, some requests don't have the parameter.

ZZ Coder 2010-09-10 21:41:50

Answer 3

+1 A:

1283458471913 is a unix timestamp in ms, probably a bot/proxy making sure that they get a fresh page and not a cached version.

Could also be jQuery which would cause this for AJAX request of you have the nocache attribute set to true.

if ( s.cache === false && type == "GET" ) {
    var ts = now();
    // try replacing _= if it is there

    var ret = s.url.replace(/(\?|&)_=.*?(&|$)/, "$1_=" + ts + "$2″);
    // if nothing was replaced, add timestamp to the end

    s.url = ret + ((ret == s.url) ? (s.url.match(/\?/) ? "&" : "?") + "_=" + ts : "");
}

jfrobishow 2010-09-10 19:36:08

Answer 4

+1 A:

It could be the JQuery CacheBuster parameter.

Resources :

Colin Hebert 2010-09-10 19:39:07

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Who Add "_" Single Underscore Query Parameter?

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