‎DuckDuckGo, Duck ai, & VPN App

Oh, and our browser is free — we make money from privacy-respecting search ads, not by exploiting your data. Our built-in search engine is like Google but never tracks your searches. Since version 6.0.6, Tor Browser has used DuckDuckGo as its default search engine. Rather than operating its own search index, Startpage retrieves Google results and delivers them without tracking your activity, acting as a privacy layer on top of Google’s search technology. It carries the same tracker-blocking capabilities as the mobile app and uses DuckDuckGo as its default search engine.

In most cases, the default is public, meaning the response can be cached by any cache such as a CDN or proxy. It strikes a balance between ensuring relatively fresh content while potentially saving bandwidth when the resource hasn’t changed. Also useful for real-time data that needs to always be fresh, like stock prices or live sports scores. It is suitable for sensitive data or regularly changing data that you don’t want to be cached. In practice, you can combine multiple directives to create more customized caching strategies. You can specify one or more directives within the Cache-Control header.

• By setting the right headers, you can improve your website’s performance, and in some cases, have your users experience near-instant page loads.
• You can also enable the “Cache Control” column to view cache settings for all resources.
• Cache storage is allowed to cache it heuristically — so if you have any requirements on caching, you should always indicate them explicitly, in the Cache-Control header.
• These Instant Answers are collected from third-party APIs or static data sources such as text files.
• Stale responses are served for up to 30seconds while the CDN revalidates in the background.

No-cache allows clients to request the most up-to-date response even if the cache has a fresh response. If no request happened during that period, the cache became stale and the next request will revalidate normally. When you use a cache-busting pattern for resources and apply them to a long max-age, you can also add immutable to avoid revalidation. The immutable response directive indicates that the response will not be updated while it’s fresh. No-transform indicates that any intermediary (regardless of whether it implements a cache) shouldn’t transform the response contents.

Test cache-control headers with synthetic testing​

In the waterfall, resources that are loaded from the cache are marked by a “cache” badge for the request. After the initial visit, websites are usually much faster thanks to caching. You’ll often find that pages load extremely fast if previously loaded resources can be re-used. If you want to see how fast your website loads with the right caching settings in place, try the warm load feature in DebugBear’s 4rabet original app download synthetic website monitoring product.

Caching static assets with “cache busting”

Internal surveys by DuckDuckGo found that DuckDuckGo users had a wide variety of political leanings. In September 2013, the search engine hit 4 million searches per day and in June 2015, it hit 10 million searches per day. Danny Sullivan wrote on Search Engine Land that despite the search engine’s growth “it’s not grown anywhere near the amount to reflect any substantial or even mildly notable switching by the searching public” for reasons due to privacy, and he concluded “No One Cares About “Private” Search”. On average, during May 2013, it had 1.8 million daily direct searches. In December 2024, DuckDuckGo criticized Google’s proposed remedies in an antitrust case related to search engine monopolies.

Cached resources must be validated with the origin server before each reuse, even if they haven’t expired. You can also enable the “Cache Control” column to view cache settings for all resources. This guide explains the most common Cache-Control headers, their practical applications, and provides real-world examples for different scenarios.

By May 2012, the search engine was attracting 1.5 million searches a day. We invested in it because there is a need for a private search engine. In July 2010, Weinberg started a DuckDuckGo community website (duck.co) to allow the public to report problems, discuss means of spreading the use of the search engine, request features, and discuss open sourcing the code.