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Caching Tutorial for Web Authors and Webmasters

Caching Tutorial for Web Authors and Webmasters
for Web Authors and Webmasters This is an informational document. Although technical in nature, it attempts to make the concepts involved understandable and applicable in real-world situations. Because of this, some aspects of the material are simplified or omitted, for the sake of clarity. If you are interested in the minutia of the subject, please explore the References and Further Information at the end. What’s a Web Cache? A Web cache sits between one or more Web servers (also known as origin servers) and a client or many clients, and watches requests come by, saving copies of the responses — like HTML pages, images and files (collectively known as representations) — for itself. There are two main reasons that Web caches are used: To reduce latency — Because the request is satisfied from the cache (which is closer to the client) instead of the origin server, it takes less time for it to get the representation and display it. Kinds of Web Caches Browser Caches Proxy Caches Gateway Caches

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An Introduction to Graphviz via R. Kelly’s “Trapped in the Closet” Hip Hopera : Rob's Blog As our world becomes more connected it has become of the utmost importance to clearly and easily visualize the structures that represent the modern digital age: the graph. Anyone involved in object oriented programming, artificial intelligence, networks, social media, or of course the fascinating field of graph theory makes heavy use of these structures. Graphs are a fertile topic that I plan to write more about, but for now we will focus on the immediately practical: the fantastic open source graph visualization toolkit Graphviz.

Creating Fast Buttons for Mobile Web Applications - Mobile Ryan FioravantiJanuary 2011 Background Here at Google, we’re constantly pushing the boundaries of what’s possible in a mobile web application. Technologies like HTML5 allow us to blur the distinction between web apps and native apps on mobile devices. As part of that effort we’ve developed a technique for creating buttons that are far more responsive than plain HTML buttons. Previously for a button, or any clickable element, we might have just set up a click handler.

List of HTTP header fields HTTP header fields are components of the message header of requests and responses in the Hypertext Transfer Protocol (HTTP). They define the operating parameters of an HTTP transaction. General format[edit] Field names[edit] A core set of fields is standardized by the Internet Engineering Task Force (IETF) in RFC 2616 and other updates and extension documents (e.g., RFC 4229), and must be implemented by all HTTP-compliant protocol implementations. Additional field names and permissible values may be defined by each application.

Bluetooth-Enabling a Panasonic SA-AK33 Logitech’s bluetooth audio receiver is a great device. It has good range, sound, and build quality. The original plan was to put it into my car to add bluetooth reception, but that plan disappeared when it turned into a install-a-new-stereo project. Creating Your Own CMS Part 1 - Secure Login Have you ever built a site to realize it is a pain to manage? There are a lot of CMS options out there but some of them cost money, some are hard to learn, some your hosting company might not support, and well sometimes they just don’t have everything thing that you want. So today I am going to start to teach you how to create your own simple CMS. Today I will get into how you can find a design and get your secure login setup. This will be a series of blogs but to be honest I am not sure how advanced I will be going.

Browser ID Strings (a.k.a. User Agent ID) This page was getting big - we're talking big. So we split the mobile things onto a separate page. We started these pages with four strings because we had never seen a comprehensive list anywhere. Nominally RFC 1945 and RFC 2068 define them (get RFCs) but only as an afterthought (the RFCs define HTTP 1.0 and 1.1). Basics of Memory Addresses in C Memory Addresses It is helpful to think of everything in C in terms of computer memory. Let’s think of computer memory as an array of bytes where each address in memory holds 1 byte. If our computer has 4K of memory for example, it would have 4096 elements in the memory array.

How to access blocked websites – Top 10 Before you try out any of the methods listed here, I suggest you install Firefox browser. For faster and smoother internet access, Firefox is the best browser available out there. When you are accessing proxy sites or similar sites ensure that you use Firefox not Internet Explorer. Internet censoring is now everywhere. In my office Orkut is blocked since there was an Orkut virus scare. Countries such as China, Saudi Arabia etc. routinely block many websites. s blog: Digging Deeper with htracr Saturday, 27 November 2010 There’s a lot of current activity on the binding between HTTP and TCP; from pipelining to SPDY, the frontier of Web performance lives between these layers. To get more visibility in exactly what’s happening down there, I decided to throw together a little tool to show how HTTP uses TCP: htracr. In a nutshell, It’s a packet sniffer written in JavaScript, thanks to node_pcap, and it uses RaphaelJS to visualise what’s going on. It’s still very young (lots of bugs to fix, lots of features to add), but I thought I’d share some early observations that it’s made possible. Twiddling the Initial Congestion Window

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