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The video titled "Ruby, HTTP/2 and You" presented by Hiro Asari at RubyConf AU 2017 delves into the evolution of the Hypertext Transfer Protocol (HTTP) and introduces HTTP/2, emphasizing its significance for Ruby developers. The presentation begins by tracing the origins of the web, initiated by Tim Berners-Lee in 1989, and outlines the transition from early protocols like Gopher to HTTP 1.0 and ultimately HTTP 1.1.

### Key Points Discussed:
- **HTTP History:**  
  - Introduction of Tim Berners-Lee and the concept of linking documents.  
  - Development through HTTP 1.0 (1996) and HTTP 1.1 (1999), detailing how requests and server responses evolved over time.

- **Characteristics of HTTP 1.1:**  
  - Plain text headers and TCP connection reuse enhance performance.  
  - Requests are queued by the server, necessitating careful optimization of resource requests by developers.

- **Overview of HTTP/2:**  
  - HTTP/2, or H2, is based on Google’s SPDY protocol, introduced in 2009 and standardized in 2015.  
  - Key features include binary headers, header compression via HPACK, and full duplex operations which improve communication between clients and servers.

- **Benefits of H2:**  
  - Supports multiple connections, allowing for simultaneous request handling without blocking.  
  - Server push capabilities enable servers to send resources to clients proactively.

- **Tooling and Implementation:**  
  - Major browsers (Chrome, Firefox, etc.) support H2, but command-line tools like cURL are still developing their H2 support.  
  - Developers can utilize CDN for asset delivery and minimize DNS lookups to boost performance.

- **When Implementing H2 in Ruby:**  
  - Recommendations include using Rack-based frameworks (Rails, Sinatra) and considering the limitations of current implementations.  
  - Existing Ruby libraries for H2 include ‘http2’ and ‘DS9’, with emphasis on developing fallback logic for handling downgrades to HTTP/1.1.

### Conclusions and Takeaways:
- Developers are encouraged to adopt best practices for both HTTP/1.1 and H2 to ensure optimal performance.  
- The presentation highlights that ongoing developments in H2 integration into Ruby frameworks are essential for leveraging its full potential for future applications.

By understanding the features and advantages of HTTP/2, developers can prepare for enhanced performance in their web applications.

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