pf » If-Modified-Since and CFML Part III

February 22, 2005

If-Modified-Since and CFML Part III

Roger Benningfield pointed out to me that most clients use a value from a Last-Modified header as the value sent in the If-Modified-Since. So you will want to ensure that you are setting that header as well, if your planning on checking for If-Modified-Since. To add it simply use the cfheader tag:

<cfheader name="Last-Modified" value="#lastModifiedDate#">

Again make sure the date uses the correct format, use the GetHttpTimeString() function.

Roger also has a post on supporting conditional GETs with CF. I will post some info on ETags soon.

Permalink | Add Comment |

add to del.icio.us | Tags: cfml, if-modified-since, rss

Related Entries

If-Modified-Since and CFML Part II - February 18, 2005
Supporting If-Modified-Since HTTP header in CFML - February 18, 2005
8 Ways to Save Bandwidth on your RSS Feed - July 12, 2007
Parsing RSS 1.0 with ColdFusion MX - April 8, 2004
RSS and XPath - April 8, 2004

This entry was:

Trackbacks

Trackback Address: 240/74636A7479C6FFD9B5BBAB7183DF5B0D

Comments

On 02/22/2005 at 8:56:09 PM MST Daniel wrote:

You should also look at using the ETAG http header and the if_not_match reponse header. Etag can be any text value you want and the if-not-match returns that text value back to you. So for a blog you could put the ID of the article and the last comment made so the next page load could use the cache unless someone had posted a new comment.