EdgeSuite 4.2 ESI Examples

• Ad Example
• Displays different HTML ad output based upon the users browser type
  
• The browser is detected using the HTTP_USER_AGENT variable
• Attempts to esi:include the HTML for the ad by referencing an ad server
• If the ad server cannot be contacted, a default ad is sent to the browser
  
• Geographic Example using EdgeScape
• Displays the geographic information associated with the client's IP address
• The geographic information for the client's IP address is stored in the EdgeScape database and made available through the $(GEO) variable
• Displays only the geographic information that is currently available for the client's IP address
• Includes description of each geographic value available
• Country Home Page Example using EdgeScape
• Based on the country location of the client, loads corresponding country home page for the web site.
• Note, only the ESI source code is displayed in this example.
• Eliminating a Splash Screen for Geographies Example using EdgeScape  (View Source Code) (View Source Code)
  
• The following ESI example eliminates the need for a splash screen that gathers an end-users geographic information and directs them to
  the appropriate page accordingly. Using ESI the spash screen can be eliminated as it can use the EdgeScape information in ESI to send the user automatically to the appropriate page.
• End users country code is checked by ESI's $(GEO) variable and if it matches US, DE, JP or FR the appropriate country page is returned. If none of the country codes checked match, a default page is returned.   
• User Agent Example
• Example to show how to use the HTTP_USER_AGENT variable to determine the client's browser type, and OS type
• View ESI Source Example
• Dynamically creates the view source link based upon the query string value
• Determines if the page is being called as an esi:included fragment or being referenced directly so you can view the souce the page itself.
• Examples from www.akamai.com
• Lists two ESI examples from the www.akamai.com web site
• Date Example
• Displays a date string using the $strftime()   function
• Dynamic Include URL using Date Example
• The example dynamically builds the esi:include source URL based on  the current date.
• Note, only the ESI source code is displayed in this example.
• Loop Example
• Displays multiple values of query string with the same name using   a list and recursively iterating through the list by using a recursive esi:include
• Note, ESI supports up to five levels of includes
• Page Rotation Example (Query String)
• Uses a query string parameter to determine which page to esi:include from a list of pages
• Uses a dictionary of numbers as strings to numbers as numbers to create the navigation, which requires numeric operators
• Dynamically builds the previous and next links using the $(REQUEST_PATH) variable
• Page Rotation Example (Cookies)
• Uses a cookie to determine which page to esi:include from a list of pages
• Uses a dictionary of numbers as strings to numbers as numbers to determine which page to display based on numeric operators
  
• Uses a dictionary of numbers as numbers to numbers as strings to add the number as string value to the cookie
• The function $add_header() is used to set the cookie used to determine which page to esi:include
  
• Image Rotation Example
• Uses a query string parameter to determine which image to display in the HTML image tag from a list of images
• Uses a dictionary of numbers as strings to numbers as numbers to create the navigation, which requires numeric operators
• Dynamically builds the previous and next links using the $(REQUEST_PATH) variable
  
• Randomly Chosen Image Example
• Uses rand() function to randomly display an image picked from a predefined list of images
• Web Tour using Query String Example  (View Source Code)
• Uses a query string parameter to determine which URL to display in the HTML frame from a list of URLs
• The browser will automatically refresh the page after five seconds with the query string, which will cause next URL to be displayed in the frame
  
• Dynamically builds the URL to the frame source
• Web Tour using Cookie Example  (View Source Code)
• Uses a cookie to determine which URL to display in the HTML frame from a list of URLs
• The browser will automatically refresh the page after five seconds sending along the cookie, which will cause next URL to be displayed in the frame
• Dynamically builds the URL to the frame source
  
• Quote Navigation Example             
  • Uses a query string parameter to determine which humorous quote to include from a list of humorous quotes
  • Uses a dictionary of numbers as strings to numbers as numbers to create the navigation, which requires numeric operators
  • Dynamically builds the previous and next links using the $(REQUEST_PATH) variable
• Set Cookie Example
• Determines if a cookie is present and if the cookie if present, displays the cookie using $(HTTP_COOKIE) variable
• If the cookie is not present, uses the $set _header() function to add a presistent cookie with a 24 hour expiration to the response
• Setting Expires and Cache Control Headers for Downstream Caching
• Sets a 24 hour HTTP Expires and Cache-Control headers to the response to allow for downstream caches to cache the page and the Expires HTTP-EQUIV tag to allow browsers to cache the page
  
• Setting Expires and Cache Control Headers for Downstream Cache Busting
• Sets a HTTP Expires, Cache-Control and Pragma headers to the response to disallow for downstream caches from caching the page and the Expires and Pragma HTTP-EQUIV tags to disallow browsers from caching the page.
• Form Processing Example
• Demonstrates how to store state of a multiple page and multiple form submission process
• Uses the $url_decode() function to properly decode the form variables
• Quiz Example
• Demonstrates using form processing logic with ESI and other ESI features.