Service Worker Head Start Chunk Caching for Web Page Loading
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Solution Overview
Problem
Current web page loading times are inefficient due to the need for browsers to wait for the entire page to be downloaded before fetching resources, which affects user experience and revenue, especially since a significant portion of the web page, particularly the 'head' section, remains static across page loads.
Innovation Solution
Implementing a client-side script that registers as a proxy and caches the static 'head start chunk' of a web page, allowing it to be rendered immediately while simultaneously requesting the full page, thus reducing loading time by enabling parallel resource fetching and minimizing network round-trip delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the browser waits for the entire page to be downloaded before fetching resources, then the page structure is complete, but the loading time increases significantly
Solution Approach 1:
The patent segments the web page into two distinct parts: a static head section and a dynamic body section. The head section containing meta tags, CSS links, and JavaScript references is separated from the body content. This segmentation enables the browser to fetch and process the head section independently and in parallel with the body, eliminating the sequential dependency that causes long loading times while ensuring the page structure is complete enough to display.
Solution Approach 2:
The patent implements preliminary action by pre-fetching the static head section before the user actually needs to view the page. The service worker caches the head section in advance, so when the user visits the page, the head is already ready to be displayed immediately. This preliminary retrieval of critical resources significantly reduces the Time To First Byte and overall loading time.
2Loss of time
If the browser fetches resources in parallel with page arrival, then loading time is reduced, but the head section must be delivered completely first
Solution Approach 1:
The patent introduces a service worker as an intermediary between the browser and the web server. The service worker intercepts requests for the web page, extracts and caches the static head section, and then serves it to the browser. This intermediary mechanism enables parallel resource fetching without requiring complex changes to the standard HTTP protocol or page delivery mechanism, maintaining simplicity while achieving performance improvement.
3Loss of time
If the head section is made static and cached, then subsequent page loads are faster, but the system must handle both static and dynamic content differently
Solution Approach 1:
The patent applies local quality by treating different sections of the web page differently based on their characteristics. The head section, being static and unchanged across page loads, is handled through caching and pre-fetching mechanisms. The body section, containing dynamic content, is handled through standard sequential retrieval. This differentiated approach optimizes performance for the static portion while maintaining flexibility for the dynamic portion, resolving the contradiction between speed and adaptability.
Data Source
AI summary
A browser receives a web page that includes a script that is configured to control subsequent requests of the browser for at least the web page and caches a first portion of the web page that includes reference(s) to other web resource(s). A subsequent request for the web page is dispatched to the script which returns the cached first portion of the web page to the browser and a request for the full web page is made. Request(s) are also transmitted for the web resource(s) referenced in the first portion of the web page without waiting for the full web page to be received. When the full web page is received, if the first portion of the page matches the corresponding portion of the full page, that corresponding portion is removed from the full page and the remaining page is returned to the browser.