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+---
+title: "Serverside and Clientside Redirection"
+date: 2011-04-23T00:01:30+05:30
+draft: false
+author: rhnvrm
+categories:
+ - notes
+tags:
+ - php
+ - js
+url: blog/2011/04/23/redirection/
+type: post
+---
+
+Redirection can be achieved Server-Side or Client-Side.
+
+Redirection on client side involves the following steps:
+
+1. User requests a Page using an URI.
+2. Server sends a page based on that.
+3. That page will have JavaScript that will redirect user to another page.
+4. So, again server will get the request for the new page and then server will
+give response based on new request.
+5. That implies:
+Client-side -> Server-side -> Client-side -> Server-side -> Client-side.
+
+Redirection on Server-Side:
+
+1. User requests a Page using URI.
+2. Server sends a page based on that.
+3. Client sends header information back to the server
+(further reading: [HTTP Headers](http://www.softswot.com/http-header.php))
+4. The server responds very quickly
+5. Client receives header and can follow quickly to the new location.
+6. Client-side -> Server-side -> Client-side(header information) -> Server-side -> Client-side.
+
+Server-Side redirection is faster and more user friendly than Client-Side
+redirection both for the client and the server.
+
+## PHP Redirection
+
+```php
+
+```
+
+This piece of code redirects you to a different page, but the catch is — it
+won’t work if you echo‘ed some output to the browser. The function actually
+modifies the HTML headers to include location. Headers are always sent to the
+browser before any content, and therefore it’s too late to modify them after
+output has started. Fortunately, there is a quite
+simple solution for that.
+
+### Output Buffers
+further reading: [Output Control Functions](https://www.php.net/ref.outcontrol)
+in PHP allow you to collect all output data into an output buffer before sending
+ it to the browser. Using the following code:
+
+```php
+
+```
+
+## Javascript Redirection
+
+Now we will see redirection using Javascript that is supported by every
+modern browser and does not require any resources of the server. Javascript is
+an object oriented language and blends with HTML.
+
+So, you want to move to another webpage after a certain interval. Or you want
+to tell your visitors that your site has moved and transfer the to your
+new site. Or you want to make an advertisement service. Well then Javascript
+redirection is for you.
+
+The primary use of JavaScript is to write functions that are embedded in
+or included from HTML pages and that interact with the [Document Object
+Model](http://en.wikipedia.org/wiki/Document_Object_Model) (DOM) of the page.
+
+So, what we can logically do is to alter the window’s location property
+using the following code:
+
+```html
+
+```
+
+Now you might want to create a timed delay between redirection so that
+people know that they are being transfered to a new location.
+
+```html
+
+
+
+
+
+ Prepare to be redirected!
+
+ This page is a time delay redirect,
+ please wait for 5000 milliseconds (5 seconds)
+
+
+
+```
+
+[setTimeout()](https://www.w3schools.com/jsref/met_win_settimeout.asp) Method
+calls a function or evaluates an expression after a specified number of
+milliseconds, where:
+
+```javascript
+setTimeout(myfunc(),millisec)
+```
+
+millisec = the number of milliseconds to wait before executing the code
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