One-Time Cache for Dynamic Web Content Latency
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Solution Overview
Problem
Traditional caching methods are ineffective for dynamic web content, leading to increased latency and user wait times, as dynamic webpages are typically treated as non-cacheable and require retrieval from the origin server, blocking resource downloads during the retrieval process.
Innovation Solution
One-time caching (OTC) involves prefetching responses to dynamic webpage requests from an origin server and pre-populating an OTC cache, allowing for immediate delivery of non-personalized dynamic webpages without forwarding requests across networks, reducing latency and improving user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If dynamic webpages are retrieved from the origin server, then content accuracy is maintained, but latency and user wait time increase
Solution Approach 1:
The system performs preliminary actions by prefetching dynamic webpage content from the origin server before actual user requests arrive. The OTC cache pre-populates itself with content that is likely to be requested, so when a user does request the content, it is already available locally, eliminating the need to wait for origin server retrieval while maintaining content accuracy.
Solution Approach 2:
The OTC cache acts as an intermediary between the origin server and the web browser. It receives and stores copies of dynamic content from the origin server, then serves this cached content directly to browsers when requested. This intermediary layer reduces the direct communication burden on the origin server and significantly reduces latency for users while preserving content integrity through controlled caching mechanisms.
2Speed
If dynamic webpages are cached traditionally, then retrieval speed improves, but cacheability is lost due to dynamic nature
Solution Approach 1:
The system applies dynamics by making the caching mechanism adaptive to dynamic content. The OTC cache continuously monitors and updates its cached content based on changing conditions, such as content expiration, content changes on the origin server, and usage patterns. This allows the cache to remain effective for dynamic content that would traditionally be considered non-cacheable, maintaining both retrieval speed and adaptability.
Solution Approach 2:
The system changes parameters by dynamically adjusting cache validity periods, cache update frequencies, and content freshness thresholds based on the specific characteristics of each dynamic webpage. This allows the caching system to optimize retrieval speed while adapting to the varying degrees of dynamism in different web content, making previously non-cacheable content cacheable under appropriate parameter configurations.
3Reliability
If web browser waits for HTTP response, then content is retrieved accurately, but resource downloads are blocked
Solution Approach 1:
The OTC cache performs preliminary actions by pre-loading and storing webpage content and its associated resources before the browser needs them. When a user requests a webpage, the cached content is immediately available, and associated resources can be downloaded in parallel without blocking the browser. This eliminates the sequential waiting period where resource downloads were blocked, significantly improving productivity while maintaining content accuracy.
Data Source
AI summary
A method of delivering dynamic web content by a proxy server is disclosed. A plurality of responses to requests for dynamic web content at a URL (uniform resource locator) is prefetched by a proxy server from an origin server. The plurality of prefetched responses is cached by the proxy server in a one-time cache, wherein each prefetched response cached in the one-time cache is served at most once and then removed from the one-time cache. A request from a client device for the dynamic web content at the URL is received by the proxy server. One of the plurality of prefetched responses cached in the one-time cache is served by the proxy server to the client device, wherein the one of the plurality of prefetched responses is removed from the one-time cache after the one of the plurality of prefetched responses has been served.