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What is SPDY Application Load Testing?

The main goal of SPDY is to reduce web page load time. This is achieved by prioritizing and multiplexing the transfer of web page subresources so that only one connection per client is required. TLS encryption is nearly ubiquitous in SPDY implementations, and transmissions are gzip or deflate compressed by design. Moreover, servers may hint or even push content instead of awaiting individual requests for each resource of a web page.

The SPDY project defines and implements an application layer protocol for the web which strongly reduces latency. The goals for SPDY are:

  • To target a 50% reduction in page load time.
  • To minimize deployment complexity. SPDY uses TCP as the underlying transport layer, so requires no changes to existing networking infrastructure.
  • To avoid the need for any changes to content by website authors. The only changes required to support SPDY are in the client user agent and web server applications.
  • To bring together like-minded parties interested in exploring protocols as a way of solving the latency problem.
  • To allow many concurrent HTTP requests to run across a single TCP session.
  • To reduce the bandwidth currently used by HTTP by compressing headers and eliminating unnecessary headers.
  • To define a protocol that is easy to implement and server-efficient.
  • To make SSL the underlying transport protocol, for better security and compatibility with existing network infrastructure. Although SSL does introduce a latency penalty, we believe that the long-term future of the web depends on a secure network connection. In addition, the use of SSL is necessary to ensure that communication across existing proxies is not broken.
  • To enable the server to initiate communications with the client and push data to the client whenever possible.

SPDY does not replace HTTP; it modifies the way HTTP requests and responses are sent over the wire. This means that all existing server-side applications can be used without modification if a SPDY-compatible translation layer is put in place. When sent over SPDY, HTTP requests are processed, tokenized, simplified and compressed.

Load testers will need now to test and code their scripts on both, HTTP and SPDY protocol.

Learn More about Performance with SPDY

mod_spdy is a SPDY module for Apache 2.2 that allows your web server to take advantage of SPDY features like stream multiplexing and header compression.

Recommended Tool

NeoLoad is a performance testing tool which supports SPDY application testing.

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