In early 2015, HTTP/2 was introduced as the new standard by IESG. This standard makes your application faster, simpler, and more robust. In this article, we take you through the differences between HTTP/1 and HTTP/2, the benefits, using HTTP/1 and HTTP/2 with windows tools for developers and some key terms.
Table of Contents
Why should I use HTTP/2?
Converting from using HTTP/1 to HTTP/2 brings the following benefits:
- HTTP/2 reduces latency by enabling full request and response multiplexing.
- Efficient compression of HTTP header fields.
- Support for request prioritization.
- Multiple concurrent exchanges on the same connections.
- An unsolicited push of representations from servers to clients.
What is SPDY?
SPDY was an experimental protocol, developed at Google and announced in mid-2009. The primary goal with SPDY was to try to reduce the load latency of web pages by addressing some of the well-known performance limitations of HTTP/1.1. Since 2012 the new experimental protocol was supported by the Chrome, Firefox, and Opera web browsers. A rapidly growing number of sites, both large and small, were deploying SPDY within their infrastructure. In effect, SPDY was on track to become a de facto standard through growing industry adoption. After a lot of discussion within the working group, the SPDY specification was adopted as a starting point for the new HTTP/2 protocol. If you want to read more about this click here for the full story
What are the key differences between HTTP/1.x and HTTP/2?
The most significant changes between HTTP/1.x and HTTP/2 are :
- There is a new binary framing layer which dictates how the HTTP messages are encapsulated and transferred between the client and server.
- The HTTP semantics, such as verbs, methods, and headers, are unaffected, but the way they are encoded while in transit is different.
- Unlike the newline delimited plaintext HTTP/1.x protocol, all HTTP/2 communication is split into smaller messages and frames, each of which is encoded in binary format.
- All communication is performed over a single TCP connection.
For the official “RFC” document describing HTTP/2 you can go to the following link: https://datatracker.ietf.org/doc/html/rfc7540#section-4
What are the performance differences between HTTP/1.x and HTTP/2?
The really great thing about Delphi is that we can already use the latest technology so that server applications with the HTTP/2 protocol can be implemented by developers. One of the Embarcadero Technology Partners, namely ESEGECE, has created a HTTP server component which implements the HTTP/2 protocol.
Let’s compare the performance difference between the HTTP/1 and HTTP/2 using ESEGECE’s components. You can download a trial version here: https://www.esegece.com/websockets/download
In my tests, HTTP/2 has a speed of at least 50% more than HTTP/1.x.
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Sorry about that. It looks like something changed on the video hosting site. I’ve had to remove the video – I’ve updated the post to reflect that. Thanks for pointing it out.