HTML
HTML

HTML Cache External Images Only

In process of trying to optimize http://www.dealer24x7.com/Used/1/Inventory/ the recommendation we are getting from google's page speed insights (https://developers.google.com/speed/pagespeed/insights) is to leverage caching.

What meta tag do we need to use to specify caching images (local and external) longer (say 3 months) and caching the HTML of the page for only a week?

p.s.
The goal is to leverage public cache pools by using
<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="PUBLIC">

LVL 12

ullfindsmitAsked: 2012-12-25

Who is Participating?

Solutions

LVL 17

selvolConnect With a Mentor Commented: 2012-12-25

Depending on your need to do this.

I'll just put this out here.
I have used this in the past.
What is does is takes an external Image and makes it local..
(FOR JPG's)
Create this page on your server in the root DIR and Name it extimage.php
NO Spaces BEFORE this.

<?php header('Content-type: image/jpg') ; 
$external_image = file_Get_contents($_GET['url']);
echo $external_image; ?>

Open in new window

Link to it like so

http://www.dealer24x7.com/extimage.php?url=http://photos.ecarlist.com/05/mg/gF/ao/gQ/gI/1X/r8/6H/KZ/dg_640.jpg

Open in new window

To add it into HTML would be like

<img src="http://www.dealer24x7.com/extimage.php?url=IMAGE PATH TO EXTERNAL JPG HERE">

Regards SELvol

LVL 17

selvolCommented: 2012-12-25

It's not a META tag.

Its a server Issue or setting

If you use IIS

http://www.iis.net/learn/manage/managing-performance-settings/configure-iis-7-output-caching

Selvol

LVL 12

ullfindsmitAuthor Commented: 2012-12-25

Unfortunately some (or even a good majority) of the images come from third party servers that I have no control over

LVL 84

Dave BaldwinFixer of ProblemsCommented: 2012-12-25

Image files don't have META tags or any other HTML in them. That would have to be done on the server. Here's a page about doing in Apache: http://www.chicagostyleseo.com/2010/04/googles-need-for-speed-use-cache-and-htaccess-to-speed-up-your-site/ I don't know how to set this up in IIS. I that in the other comment.

If they're from third party servers, there is nothing you can do about it.

LVL 12

ullfindsmitAuthor Commented: 2012-12-25

So is there an HTML tag on the HTML page that I can use to say cache this page and its contents (local and external images) for 7 days?

LVL 84

Dave BaldwinFixer of ProblemsCommented: 2012-12-25

No.

LVL 12

ullfindsmitAuthor Commented: 2012-12-25

While it aint pretty, it does the job

LVL 17

selvolCommented: 2012-12-25

Glad You appreciate that script....

Who needs pretty, when your sneaky.

You could Save the external image to a local FOlder.
Add a Check to see if the File exists before the PHP
gets the external Image.

Regards Selvol