Welcome!

Wearables Authors: Carmen Gonzalez, Elizabeth White, Liz McMillan, Pat Romanski, Yeshim Deniz

Blog Feed Post

What are you waiting for?

The future of HTTP is here, or almost here.   It has been 5 years since SPDY was first introduced as a better way to deliver web sites.  A lot has happened since then. 

  • Chrome, Firefox, Opera and some IE installations support SPDY.
  • SPDY evolved from v2 to v3 to v3.1.
  • Sites like Google, Facebook, Twitter, and Wordpress to name just a few are available via SPDY.
  • F5 announced availability of a SPDY Gateway.
  • The IETF HTTP working group announced SPDY is the starting point for HTTP/2.
  • And most recently - Apple has announced that Safari 8, due out this fall,  will support SPDY!  This means that all major browsers will support SPDY by the end of the year.  

By the end of the year all major browsers will support SPDY, and the IETF is scheduled to have the HTTP/2 draft finalized.  This week the IETF working group published the latest draft of the HTTP/2 spec.  The hope is that this will be the version that becomes the proposed RFC.  

The Internet Explorer team  posted a blog at the end of May indicating that they have HTTP/2 in development for a future version of IE, there is no commitment whether this will be in IE 12 or another version but they are preparing for the shift.  We at F5, have been following the evolution of the spec and developing prototypes based on the various interoperability drafts to make sure we are ready as soon as possible to implement an HTTP/2 gateway.   So what are you waiting for, why are you not using SPDY on your site?

Using SPDY today allows you to see how HTTP/2 may potentially impact your applications and infrastructure.   HTTP/2 is not a new protocol, there are no changes to the HTTP semantics and it does not obsolete the existing HTTP/1.1 message syntax.   If it’s not a new protocol and it doesn’t obsolete HTTP/1.1 what is HTTP/2 exactly?  Per the draft’s abstract:

This specification describes an optimized expression of the syntax of
   the Hypertext Transfer Protocol (HTTP).  HTTP/2 enables a more
   efficient use of network resources and a reduced perception of
   latency by introducing header field compression and allowing multiple
   concurrent messages on the same connection.  It also introduces
   unsolicited push of representations from servers to clients.

   This specification is an alternative to, but does not obsolete, the
   HTTP/1.1 message syntax.  HTTP's existing semantics remain unchanged.

HTTP/2 allows communication to occur with less data transmitted over the network and with the ability to send multiple requests and responses across a single connection, out of order and interleaved – oh yeah and all over SSL.  

Let’s look at these in a little more detail.  Sending less data has always been a good thing but just how much improvement can be achieved by compressing headers.     It turns out quite a bit.    Headers have a lot of repetitive information in them: the cookies, encoding types, cache settings to name just a few.  With all this repetitive information compression can really help.    Looking at the amount of downloaded data for a web page delivered over HTTP and over SPDY we can see just how much savings can be achieved.   Below is a sample of 10 objects delivered over HTTP and SPDY, the byte savings result in a total savings of 1762 bytes.   That doesn’t sound like much but we’re only talking about 10 objects.  The average home page now has close to 100 objects on it, and I’m sure the total number of hits to your website is well over that number.   If your website gets 1 million hits a day then extrapolating this out the savings become 168 MB, if the hits are closer to 10 million the savings nears 1.7 GB.   Over the course of a month or a year these savings will start to add up.  

  HTTP SPDY Byte Savings
https://.../SitePages/Home.aspx 29179 29149 30
https://.../_layouts/1033/core.js 84457 84411 46
https://.../_layouts/sp.js 71834 71751 83
https://.../_layouts/sp.ribbon.js 57999 57827 172
https://.../_layouts/1033/init.js 42055 41864 191
https://.../_layouts/images/fgimg.png 20478 20250 228
https://.../_layouts/images/homepageSamplePhoto.jpg 16935 16704 231
https://.../ScriptResource.axd 27854 27617 237
https://.../_layouts/images/favicon.ico 5794 5525 269
https://.../_layouts/blank.js 496 221 275

SPDY performed header compression via deflate, this was discovered to be vulnerable to CRIME attacks, as a result HTTP/2 uses HPACK header compression, an HTTP header specific compression scheme which is not vulnerable to CRIME.  

The next element to examine is the ability to send multiple requests and response across a single connection, out of order and interleaved.  We all know that latency can have a big impact on page load times and the end user experience.  This is why HTTP 1.1 allowed for keep-alives, eliminating the need to perform a three way handshake for each and every request.   After keep alives came, domain sharding  and browsers eventually changed the default behavior to allow more than 2 concurrent TCP connections.  The downside of multiple TCP connections is having to conduct the three way handshake multiple times, wouldn’t things be easier if all requests could just be sent over a single TCP connection.  This is what HTTP/2 provides, and not only that the responses can be returned in a different order in which they were reqeusted. 

 

HTTP2

Now onto the SSL component.  HTTP/2 requires strong crypto –128 bit EC or 2048 bit RSA.  This requirement will be enforced by browsers and cannot be disabled.   With the ever growing number of attacks having SSL everywhere is a good thing but there are performance and reporting ramifications to encrypting all data.  Organizations that deploy solutions to monitor, classify and analyze Internet traffic may no longer be able to do so.  

All the changes coming in HTTP/2 have the potential to impact how an application is rendered and how infrastructure components will react.   What are the consequences of having all requests and responses transmitted over SSL, can the network support 50 concurrent requests for objects, does the page render properly for the end user if objects are received out of order?  On the positive you could end up with improved page load times and a reduction in the amount of data transferred, stop waiting and start enabling the future of the web today.  

Read the original blog entry...

More Stories By Dawn Parzych

Dawn Parzych is a Technical Product Marketing Manager at Instart Logic. Dawn has had a passion for web performance for over 15 years with a focus on how to make the web faster. As a technical product marketing manager at Instart Logic, she researches and writes about trends in the web performance space and how they impact the user experience. Prior to joining Instart Logic, Dawn worked at F5 Networks, Gomez & Empirix.

@ThingsExpo Stories
Data is the fuel that drives the machine learning algorithmic engines and ultimately provides the business value. In his session at Cloud Expo, Ed Featherston, a director and senior enterprise architect at Collaborative Consulting, discussed the key considerations around quality, volume, timeliness, and pedigree that must be dealt with in order to properly fuel that engine.
IoT solutions exploit operational data generated by Internet-connected smart “things” for the purpose of gaining operational insight and producing “better outcomes” (for example, create new business models, eliminate unscheduled maintenance, etc.). The explosive proliferation of IoT solutions will result in an exponential growth in the volume of IoT data, precipitating significant Information Governance issues: who owns the IoT data, what are the rights/duties of IoT solutions adopters towards t...
Businesses and business units of all sizes can benefit from cloud computing, but many don't want the cost, performance and security concerns of public cloud nor the complexity of building their own private clouds. Today, some cloud vendors are using artificial intelligence (AI) to simplify cloud deployment and management. In his session at 20th Cloud Expo, Ajay Gulati, Co-founder and CEO of ZeroStack, will discuss how AI can simplify cloud operations. He will cover the following topics: why clou...
As data explodes in quantity, importance and from new sources, the need for managing and protecting data residing across physical, virtual, and cloud environments grow with it. Managing data includes protecting it, indexing and classifying it for true, long-term management, compliance and E-Discovery. Commvault can ensure this with a single pane of glass solution – whether in a private cloud, a Service Provider delivered public cloud or a hybrid cloud environment – across the heterogeneous enter...
Everyone knows that truly innovative companies learn as they go along, pushing boundaries in response to market changes and demands. What's more of a mystery is how to balance innovation on a fresh platform built from scratch with the legacy tech stack, product suite and customers that continue to serve as the business' foundation. In his General Session at 19th Cloud Expo, Michael Chambliss, Head of Engineering at ReadyTalk, discussed why and how ReadyTalk diverted from healthy revenue and mor...
The many IoT deployments around the world are busy integrating smart devices and sensors into their enterprise IT infrastructures. Yet all of this technology – and there are an amazing number of choices – is of no use without the software to gather, communicate, and analyze the new data flows. Without software, there is no IT. In this power panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, Dave McCarthy, Director of Products at Bsquare Corporation; Alan Williamson, Principal...
The 20th International Cloud Expo has announced that its Call for Papers is open. Cloud Expo, to be held June 6-8, 2017, at the Javits Center in New York City, brings together Cloud Computing, Big Data, Internet of Things, DevOps, Containers, Microservices and WebRTC to one location. With cloud computing driving a higher percentage of enterprise IT budgets every year, it becomes increasingly important to plant your flag in this fast-expanding business opportunity. Submit your speaking proposal ...
You have great SaaS business app ideas. You want to turn your idea quickly into a functional and engaging proof of concept. You need to be able to modify it to meet customers' needs, and you need to deliver a complete and secure SaaS application. How could you achieve all the above and yet avoid unforeseen IT requirements that add unnecessary cost and complexity? You also want your app to be responsive in any device at any time. In his session at 19th Cloud Expo, Mark Allen, General Manager of...
Successful digital transformation requires new organizational competencies and capabilities. Research tells us that the biggest impediment to successful transformation is human; consequently, the biggest enabler is a properly skilled and empowered workforce. In the digital age, new individual and collective competencies are required. In his session at 19th Cloud Expo, Bob Newhouse, CEO and founder of Agilitiv, drew together recent research and lessons learned from emerging and established compa...
"IoT is going to be a huge industry with a lot of value for end users, for industries, for consumers, for manufacturers. How can we use cloud to effectively manage IoT applications," stated Ian Khan, Innovation & Marketing Manager at Solgeniakhela, in this SYS-CON.tv interview at @ThingsExpo, held November 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA.
Bert Loomis was a visionary. This general session will highlight how Bert Loomis and people like him inspire us to build great things with small inventions. In their general session at 19th Cloud Expo, Harold Hannon, Architect at IBM Bluemix, and Michael O'Neill, Strategic Business Development at Nvidia, discussed the accelerating pace of AI development and how IBM Cloud and NVIDIA are partnering to bring AI capabilities to "every day," on-demand. They also reviewed two "free infrastructure" pr...
Financial Technology has become a topic of intense interest throughout the cloud developer and enterprise IT communities. Accordingly, attendees at the upcoming 20th Cloud Expo at the Javits Center in New York, June 6-8, 2017, will find fresh new content in a new track called FinTech.
Information technology is an industry that has always experienced change, and the dramatic change sweeping across the industry today could not be truthfully described as the first time we've seen such widespread change impacting customer investments. However, the rate of the change, and the potential outcomes from today's digital transformation has the distinct potential to separate the industry into two camps: Organizations that see the change coming, embrace it, and successful leverage it; and...
"Dice has been around for the last 20 years. We have been helping tech professionals find new jobs and career opportunities," explained Manish Dixit, VP of Product and Engineering at Dice, in this SYS-CON.tv interview at 19th Cloud Expo, held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA.
SYS-CON Events has announced today that Roger Strukhoff has been named conference chair of Cloud Expo and @ThingsExpo 2017 New York. The 20th Cloud Expo and 7th @ThingsExpo will take place on June 6-8, 2017, at the Javits Center in New York City, NY. "The Internet of Things brings trillions of dollars of opportunity to developers and enterprise IT, no matter how you measure it," stated Roger Strukhoff. "More importantly, it leverages the power of devices and the Internet to enable us all to im...
Extracting business value from Internet of Things (IoT) data doesn’t happen overnight. There are several requirements that must be satisfied, including IoT device enablement, data analysis, real-time detection of complex events and automated orchestration of actions. Unfortunately, too many companies fall short in achieving their business goals by implementing incomplete solutions or not focusing on tangible use cases. In his general session at @ThingsExpo, Dave McCarthy, Director of Products...
"At ROHA we develop an app called Catcha. It was developed after we spent a year meeting with, talking to, interacting with senior citizens watching them use their smartphones and talking to them about how they use their smartphones so we could get to know their smartphone behavior," explained Dave Woods, Chief Innovation Officer at ROHA, in this SYS-CON.tv interview at 19th Cloud Expo, held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA.
We are always online. We access our data, our finances, work, and various services on the Internet. But we live in a congested world of information in which the roads were built two decades ago. The quest for better, faster Internet routing has been around for a decade, but nobody solved this problem. We’ve seen band-aid approaches like CDNs that attack a niche's slice of static content part of the Internet, but that’s it. It does not address the dynamic services-based Internet of today. It does...
"ReadyTalk is an audio and web video conferencing provider. We've really come to embrace WebRTC as the platform for our future of technology," explained Dan Cunningham, CTO of ReadyTalk, in this SYS-CON.tv interview at WebRTC Summit at 19th Cloud Expo, held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA.
20th Cloud Expo, taking place June 6-8, 2017, at the Javits Center in New York City, NY, will feature technical sessions from a rock star conference faculty and the leading industry players in the world. Cloud computing is now being embraced by a majority of enterprises of all sizes. Yesterday's debate about public vs. private has transformed into the reality of hybrid cloud: a recent survey shows that 74% of enterprises have a hybrid cloud strategy.