Click here to close now.


Wearables Authors: Elizabeth White, Chris Witeck , Anders Wallgren, Chris Fleck, Brian Daleiden

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. 



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 product manager for F5 Networks, the global leader in Application Delivery Networking. For the past 2 years, she has been in London working as an acceleration architect with F5 customers based in Europe, the Middle East, and Africa. Dawn has helped companies in finance, retail, media, and other industries optimize performance levels and overcome Web application delivery challenges. In her ten years as a Web performance specialist, Dawn has covered everything from load testing to Web performance monitoring to application delivery.

@ThingsExpo Stories
The Internet of Things is clearly many things: data collection and analytics, wearables, Smart Grids and Smart Cities, the Industrial Internet, and more. Cool platforms like Arduino, Raspberry Pi, Intel's Galileo and Edison, and a diverse world of sensors are making the IoT a great toy box for developers in all these areas. In this Power Panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists discussed what things are the most important, which will have the most profound effect on the world, and what should we expect to see over the next couple of years.
PubNub has announced the release of BLOCKS, a set of customizable microservices that give developers a simple way to add code and deploy features for realtime apps.PubNub BLOCKS executes business logic directly on the data streaming through PubNub’s network without splitting it off to an intermediary server controlled by the customer. This revolutionary approach streamlines app development, reduces endpoint-to-endpoint latency, and allows apps to better leverage the enormous scalability of PubNub’s Data Stream Network.
I recently attended and was a speaker at the 4th International Internet of @ThingsExpo at the Santa Clara Convention Center. I also had the opportunity to attend this event last year and I wrote a blog from that show talking about how the “Enterprise Impact of IoT” was a key theme of last year’s show. I was curious to see if the same theme would still resonate 365 days later and what, if any, changes I would see in the content presented.
Apps and devices shouldn't stop working when there's limited or no network connectivity. Learn how to bring data stored in a cloud database to the edge of the network (and back again) whenever an Internet connection is available. In his session at 17th Cloud Expo, Ben Perlmutter, a Sales Engineer with IBM Cloudant, demonstrated techniques for replicating cloud databases with devices in order to build offline-first mobile or Internet of Things (IoT) apps that can provide a better, faster user experience, both offline and online. The focus of this talk was on IBM Cloudant, Apache CouchDB, and ...
Microservices are a very exciting architectural approach that many organizations are looking to as a way to accelerate innovation. Microservices promise to allow teams to move away from monolithic "ball of mud" systems, but the reality is that, in the vast majority of organizations, different projects and technologies will continue to be developed at different speeds. How to handle the dependencies between these disparate systems with different iteration cycles? Consider the "canoncial problem" in this scenario: microservice A (releases daily) depends on a couple of additions to backend B (re...
With all the incredible momentum behind the Internet of Things (IoT) industry, it is easy to forget that not a single CEO wakes up and wonders if “my IoT is broken.” What they wonder is if they are making the right decisions to do all they can to increase revenue, decrease costs, and improve customer experience – effectively the same challenges they have always had in growing their business. The exciting thing about the IoT industry is now these decisions can be better, faster, and smarter. Now all corporate assets – people, objects, and spaces – can share information about themselves and thei...
Two weeks ago (November 3-5), I attended the Cloud Expo Silicon Valley as a speaker, where I presented on the security and privacy due diligence requirements for cloud solutions. Cloud security is a topical issue for every CIO, CISO, and technology buyer. Decision-makers are always looking for insights on how to mitigate the security risks of implementing and using cloud solutions. Based on the presentation topics covered at the conference, as well as the general discussions heard between sessions, I wanted to share some of my observations on emerging trends. As cyber security serves as a fou...
Discussions of cloud computing have evolved in recent years from a focus on specific types of cloud, to a world of hybrid cloud, and to a world dominated by the APIs that make today's multi-cloud environments and hybrid clouds possible. In this Power Panel at 17th Cloud Expo, moderated by Conference Chair Roger Strukhoff, panelists addressed the importance of customers being able to use the specific technologies they need, through environments and ecosystems that expose their APIs to make true change and transformation possible.
There are over 120 breakout sessions in all, with Keynotes, General Sessions, and Power Panels adding to three days of incredibly rich presentations and content. Join @ThingsExpo conference chair Roger Strukhoff (@IoT2040), June 7-9, 2016 in New York City, for three days of intense 'Internet of Things' discussion and focus, including Big Data's indespensable role in IoT, Smart Grids and Industrial Internet of Things, Wearables and Consumer IoT, as well as (new) IoT's use in Vertical Markets.
Container technology is shaping the future of DevOps and it’s also changing the way organizations think about application development. With the rise of mobile applications in the enterprise, businesses are abandoning year-long development cycles and embracing technologies that enable rapid development and continuous deployment of apps. In his session at DevOps Summit, Kurt Collins, Developer Evangelist at, examined how Docker has evolved into a highly effective tool for application delivery by allowing increasingly popular Mobile Backend-as-a-Service (mBaaS) platforms to quickly crea...
The Internet of Things (IoT) is growing rapidly by extending current technologies, products and networks. By 2020, Cisco estimates there will be 50 billion connected devices. Gartner has forecast revenues of over $300 billion, just to IoT suppliers. Now is the time to figure out how you’ll make money – not just create innovative products. With hundreds of new products and companies jumping into the IoT fray every month, there’s no shortage of innovation. Despite this, McKinsey/VisionMobile data shows "less than 10 percent of IoT developers are making enough to support a reasonably sized team....
As organizations realize the scope of the Internet of Things, gaining key insights from Big Data, through the use of advanced analytics, becomes crucial. However, IoT also creates the need for petabyte scale storage of data from millions of devices. A new type of Storage is required which seamlessly integrates robust data analytics with massive scale. These storage systems will act as “smart systems” provide in-place analytics that speed discovery and enable businesses to quickly derive meaningful and actionable insights. In his session at @ThingsExpo, Paul Turner, Chief Marketing Officer at...
The cloud. Like a comic book superhero, there seems to be no problem it can’t fix or cost it can’t slash. Yet making the transition is not always easy and production environments are still largely on premise. Taking some practical and sensible steps to reduce risk can also help provide a basis for a successful cloud transition. A plethora of surveys from the likes of IDG and Gartner show that more than 70 percent of enterprises have deployed at least one or more cloud application or workload. Yet a closer inspection at the data reveals less than half of these cloud projects involve production...
With major technology companies and startups seriously embracing IoT strategies, now is the perfect time to attend @ThingsExpo 2016 in New York and Silicon Valley. Learn what is going on, contribute to the discussions, and ensure that your enterprise is as "IoT-Ready" as it can be! Internet of @ThingsExpo, taking place Nov 3-5, 2015, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with 17th Cloud Expo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world. The Internet of Things (IoT) is the most profound cha...
Internet of @ThingsExpo, taking place June 7-9, 2016 at Javits Center, New York City and Nov 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA, is co-located with the 18th International @CloudExpo and will feature technical sessions from a rock star conference faculty and the leading industry players in the world and ThingsExpo New York Call for Papers is now open.
We all know that data growth is exploding and storage budgets are shrinking. Instead of showing you charts on about how much data there is, in his General Session at 17th Cloud Expo, Scott Cleland, Senior Director of Product Marketing at HGST, showed how to capture all of your data in one place. After you have your data under control, you can then analyze it in one place, saving time and resources.
We are rapidly moving to a brave new world of interconnected smart homes, cars, offices and factories known as the Internet of Things (IoT). Sensors and monitoring devices will touch every part of our lives. Let's take a closer look at the Internet of Things. The Internet of Things is a worldwide network of objects and devices connected to the Internet. They are electronics, sensors, software and more. These objects connect to the Internet and can be controlled remotely via apps and programs. Because they can be accessed via the Internet, these devices create a tremendous opportunity to inte...
Growth hacking is common for startups to make unheard-of progress in building their business. Career Hacks can help Geek Girls and those who support them (yes, that's you too, Dad!) to excel in this typically male-dominated world. Get ready to learn the facts: Is there a bias against women in the tech / developer communities? Why are women 50% of the workforce, but hold only 24% of the STEM or IT positions? Some beginnings of what to do about it! In her Day 2 Keynote at 17th Cloud Expo, Sandy Carter, IBM General Manager Cloud Ecosystem and Developers, and a Social Business Evangelist, wil...
SYS-CON Events announced today that Kintone has been named "Bronze Sponsor" of SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. kintone promotes cloud-based workgroup productivity, transparency and profitability with a seamless collaboration space, build your own business application (BYOA) platform, and workflow automation system.
Cloud computing delivers on-demand resources that provide businesses with flexibility and cost-savings. The challenge in moving workloads to the cloud has been the cost and complexity of ensuring the initial and ongoing security and regulatory (PCI, HIPAA, FFIEC) compliance across private and public clouds. Manual security compliance is slow, prone to human error, and represents over 50% of the cost of managing cloud applications. Determining how to automate cloud security compliance is critical to maintaining positive ROI. Raxak Protect is an automated security compliance SaaS platform and ma...