HTTPS Required
This indicates that the Service Worker API, which is the core browser technology that powers Speed Kit, can only be used on websites that are served securely over HTTPS. This is a security requirement mandated by browser vendors to protect users, ensuring that this powerful technology cannot be hijacked for malicious purposes on insecure connections.
Related web performance terms
- HAR
A HAR (HTTP Archive format) file is a JSON-formatted log of a web browser's interaction with a site. It contains a detailed, timestamped record of every single network request and response, includi…
- HTML Size
The amount of data (in bytes) that comprises the HTML document sent from the server to the browser. This includes the HTML markup but excludes CSS, JavaScript, images, and other resources.
- HTMLImageElement.prototype.src Setter
This is a sophisticated programming technique used by Speed Kit's algorithm to accurately measure the Largest Contentful Paint (LCP) on complex, JavaScript-heavy sites.
- HTTP/2
HTTP/2 is a major version of the HTTP protocol designed to make websites faster and more efficient. Its key feature is multiplexing, which allows a browser to download multiple resources (like CSS…