Using Etags and Last-modified headers to improve performance with HTTP conditional requests
In the recent update of the HTTP specification, the details of conditional requests have been split out and given their whole own specification. Most developers I talk to are familiar with the idea of 304 Not Modified response code, but whenever we start to dig deeper everyone, myself included, are missing pieces of the puzzle. This article is one of a series of blog posts that attempts to dig in to aspects of HTTP and provide practical guidance on their usage.
HTTP in depth
Over the past few months I have written a number of posts relating to HTTP that have attempted to clarify some of the lesser understood areas of the HTTP specification and provide some practical guidance.
Caching resources with query strings
This afternoon Scott Hanselman posted a fairly innocuous question on twitter. However, the question involved versioning of a RESTful API, which is a subject that is sure to bring out lots of opinions. This post is less about the versioning question and more about the commonly held belief that caches do things differently with URLs that have query strings.