Several ways to clear the browser cache

Last Update:2018-08-03 Source: Internet

Author: User

Tags browser cache clear browser cache

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about Browser Caching

Browser caching, sometimes we need him, because he can improve Web performance and browser speed, improve site performance. But sometimes we have to clear the cache, because the cache may be bad, there are some wrong data. such as the stock site real-time updates, such as the site is not cached, like some sites are rarely updated, there is a cache or better. Today, there are several ways to clear the cache. several ways to clean up your Web site cache

Meta Method

Do not cache
<meta http-equiv= "pragma" content= "No-cache" > <meta http-equiv= "Cache-control" 
No-cache, must-revalidate "> 
<meta http-equiv=" expires "content=" 0 ">

Clean up temporary caching of form forms

<body onload= "Javascript:document.yourFormName.reset ()" >

In fact, the form of the cache for our writing is still helpful, the general situation does not recommend cleaning, but sometimes for security issues, need to clean up.

jquery Ajax Clear Browser Cache
Mode one: Use AJAX to request the latest files of the server, plus the request headers if-modified-since and Cache-control, as follows:

$.ajax ({
     URL: ' www.haorooms.com ',
     dataType: ' json ',
     data:{},
     beforesend:function (xmlHttp) { 
        Xmlhttp.setrequestheader ("If-modified-since", "0"); 
        Xmlhttp.setrequestheader ("Cache-control", "No-cache");
     },
     success:function (response) {
         //action
     }
     Async:false
  });

method Two, directly using Cache:false,

$.ajax ({
     URL: ' www.haorooms.com ',
     dataType: ' json ',
     data:{},
     Cache:false, 
     ifmodified: True,

     success:function (response) {
         //Operation
     }
     async:false
  });

method Three: Random number, random number is also a good way to avoid caching.

URL parameter Plus "? ran=" + math.random (); Of course, the parameter ran can be arbitrarily taken.

method Four: Use random time, same as random number.

use PHP back-end cleanup

Header ("Cache-control:no-cache, Must-revalidate") at the service End (""), etc. (as in PHP)

C # httpclient prohibit caching

           using (var client = new HttpClient ())
            {
                //Method 1: 
                cachecontrolheadervalue CacheControl = new Cachecontrolheadervalue ();
                Cachecontrol.nocache = true;
                Cachecontrol.nostore = true;
                Client. Defaultrequestheaders.cachecontrol = CacheControl;

                Method 2: 
                //client. Defaultrequestheaders.add ("Cache-control", "No-cache");
                Try
                {
                    client. Getstringasync (URL);
                    return true;
                }
                Catch
                {return
                    false;
                }
            }

C # page cleanup cache

        private void Setpagenocache () 
        {

            Response.Buffer = true;

            Response.ExpiresAbsolute = System.DateTime.Now.AddSeconds ( -1);

            Response.Expires = 0;

            Response.CacheControl = "No-cache";

            Response.AddHeader ("Pragma", "No-cache");

        }

Any sentence can be:

    (1)     Response.Buffer = true; 
            Response.ExpiresAbsolute = System.DateTime.Now.AddSeconds ( -1);

            Response.Expires = 0;

            Response.CacheControl = "No-cache";

            Response.AddHeader ("Pragma", "No-cache");

    (2) HTML method

        <meta http-equiv= "Pragma" content= "No-cache" > <meta http-equiv= "Cache-control"

Content= "No-cache" >

<meta http-equiv= "Expires" content= "0" >

    (3) when the original page is called again, pass a parameter to the page:    href = "****.aspx?random ()"

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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