Capacity Footprint API

Project Status:

(roll over for info)


January 1, 2020

Estimated Completion:

September 1, 2020
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Problem Statement

The Capacity API is intended to allow participants in the federated video delivery service to communicate availability and capacity information as needed.  The design is meant to encompass multiple use cases, including one content provider to many CDNs/ISPs as well as more complex multiparty interactions, all while preserving the flexibility and business models of the underlying providers.

Project Description

Video delivery is a complex ecosystem of content and network providers.  The content providers rely on one or more network providers (ISPs and global or regional CDNs) to connect them to their users, and at high quality levels.  One of the constraints to providing a high quality experience is network capacity constraints due to high demand or temporary infrastructure failures.  Historically, it has been challenging to provide the necessary data at the right level of detail: Too little, the content provider can’t make traffic routing decisions.  Too much, the CDN or ISP doesn’t have the flexibility needed to manage their network effectively.  Often times, sharing this information has been ad hoc, making it challenging to reuse with multiple partners.

Current Document

Capacity Footprint API

One of the core challenges in Open Caching is to understand when and where to delegate requests. Building on the CDNi (RFC 7336) and ALTO (RFC 7285) standards, the Open Caching Working Group is developing a JSON-based Capacity API to help automate this selection process.  A delegating content provider or CDN can ask an Open Caching provider if they have service within a particular region and how much capacity is available.

Project Type

Project Leads

Goals and Objectives

This project has the following goals and objectives:
  • To extend the functionality of the existing Capacity Footprint API with a number of additional features

Project Scope

The API specification produced by this project will PROVIDE:
  • A list of additional API features to meet the specific needs detailed in the problem statement
  • Description of API methods by which to provide the functionality of the newly included features
The API specification will NOT PROVIDE:
  • Any specific programming languages that should be used to carry out the API functionality
  • Any support for features not specifically listed and addressed by methods within the API


The following members have contributed to this project. Click on their name to visit their profile. If they have not published their profile, the link will redirect to their LinkedIn profile.


The following presentations delivered during Open Caching working group sessions may provide additional information about this project.

Making Streaming Video Better

The Streaming Video Alliance is committed to bringing video streaming companies together to help build a better viewer experience at scale.

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