Downstream caching refers to the caching instructions associated with objects sent with responses to clients, such as browsers, mobile devices, or client proxies. In the Downstream cacheability section, you can decouple caching in the last mile from the browser caching settings.
What are the different types of caching systems?
Four Major Caching Types and Their DifferencesWeb Caching (Browser/Proxy/Gateway): Browser, Proxy, and Gateway caching work differently but have the same goal: to reduce overall network traffic and latency. ... Data Caching: ... Application/Output Caching: ... Distributed Caching:
What is Akamai caching?
At Akamai, caching refers to objects retrieved from your origin server and stored at any number of edge servers. Edge servers can quickly deliver the cached objects to your API consumers. Caching decreases the load on your origin server and reduces latency in serving objects to the end client.
What is Max age in cache control?
Cache-control: max-age It is the maximum amount of time specified in the number of seconds. For example, max-age=90 means that a HTTP response remains in the browser as a cached copy for the next 90 seconds before it can be available for reuse.
What is key cache?
The cache key is the unique identifier for an object in the cache. Each object in the cache has a unique cache key. A cache hit occurs when a viewer request generates the same cache key as a prior request, and the object for that cache key is in the edge location's cache and valid.
Is Akamai a CDN?
Akamai Technologies, Inc. is an American content delivery network (CDN), cybersecurity, and cloud service company, providing web and Internet security services. Akamai's Intelligent Edge Platform is one of the world's largest distributed computing platforms.
How does a CDN works Akamai?
A CDN is a network of servers that distributes content from an “origin” server throughout the world by caching content close to where each end user is accessing the internet via a web-enabled device. The content they request is first stored on the origin server and is then replicated and stored elsewhere as needed.
When should you not use cache?
7 Reasons Not to Put a Cache in Front of Your DatabaseHow are most cache deployments implemented? ... An external cache adds latency. ... An external cache is an additional cost. ... External caching decreases availability. ... Application complexity — your application needs to handle more cases.More items...•
What is the difference between no-cache and no store?
no-store means do not store particular resource from the server anywhere (i.e browser or proxy caching ). no-cache doesn't mean “don't cache”, it means it must revalidate with the server before using the cached resource.
Where is HTTP cache stored?
The HTTP Cache is the module that receives HTTP(S) requests and decides when and how to fetch data from the Disk Cache or from the network. The cache lives in the browser process, as part of the network stack.
What are the best practices for caching?
Caching configuration best practicesIntegrate Fastly with your application platform. ... Check your cache hit ratio. ... Set a fallback TTL. ... Understand how cache control headers work. ... Increase Cache-Control header times. ... Configure Fastly to temporarily serve stale content. ... Decrease your first byte timeout time.More items...•
What is CF cache status?
The presence of cf-cache-status indicates that the site is using Cloudflare. The value of HIT indicates that this resource has been returned from Cloudflare's cache.
How do I choose a cache key?
Enabling Cloud CDN and customizing the cache keysIn the Google Cloud console, go to the Cloud CDN page. ... Click Add origin.In the Origin pull-down menu, click Select origin.Select the origin for which you want to enable CDN.In the row of the origin, click Configure.More items...
What is purge cache in Akamai?
Purge is a tool for refreshing specific cached objects or removing all stale content across the Akamai edge network. You can refresh your content on edge servers based on a few categories. The purge requests are propagated through the Akamai edge network, using either the invalidate or delete purge methods.
How do I skip Akamai?
How to bypass AkamaiDeobfuscate the challenge.Akamai's sensor data.Mask your sensor data.Cookies to avoid continuous challenges.
What are the key cache parameters?
Cache key settings specify the values in viewer requests that CloudFront includes in the cache key. The values can include URL query strings, HTTP headers, and cookies. The values that you include in the cache key are automatically included in requests that CloudFront sends to the origin, known as origin requests.
What is cache-control private?
Cache-Control: Private The private response directive indicates that a resource is user specific—it can still be cached, but only on a client device. For example, a web page response marked as private can be cached by a desktop browser, but not a content delivery network (CDN).
Does PageSpeed cache extend?
If so, either Disallow those resources, so PageSpeed doesn't inline or cache-extend them, or decrease the cache lifetime on your HTML.
Does HTML get served from cache?
In the interaction depicted above, note that the partially optimized HTML will be served from the cache until a purge request gets sent by the PageSpeed server. It is recommended to set up PageSpeed and the downstream caching layer servers on a one to one basis so that the purges can be sent to the correct downstream server.
Can HTML be cached?
The HTML can be cached, however, if you: Set up a PURGE handler in your cache. Tell PageSpeed the url for the PURGE handler. Have the cache set the PS-CapabilityList header so PageSpeed will emit HTML that can be sent to any browser.
Does PageSpeed support purging?
If you're integrating PageSpeed with a cache that doesn't support PURGE requests but does support purging in response to a prefixed GET request, PageSpeed can support that. You would configure your cache to treat a GET to /purge/foo/bar as a request to purge /foo/bar and configure PageSpeed as:
What is downstream development?
In software, downstream development refers to designing tools for applications that already exist or are deployed. Meanwhile, upstream refers to source code that is further "up" into development, such as bug fixes and patches.
What Are Downstream Operations?
Downstream operations are the processes involved in converting oil and gas into the finished product. These include refining crude oil into gasoline, natural gas liquids, diesel, and a variety of other energy sources. The closer an oil and gas company is to the process of providing consumers with petroleum products, the further downstream the company is said to be.
What is the difference between downstream and upstream oil?
The difference between downstream and upstream operations lies largely in the stage of the process of getting crude oil to the hands of the consumer. Upstream operations include exploring new landscapes for oil potential, discovering the crude oil, drilling and extracting it, and the initial discovery part. Another name for the upstream oil sector is the exploration and production (E&P) sector. Meanwhile, downstream operations as explored in this article include processes that occur after the production phase, all the way up to the point of sale.
What is the downstream of an oil and gas company?
The closer an oil and gas company is to the process of providing consumers with petroleum products, the further downstream the company is said to be.
What does downstream process mean in oil and gas?
Though most oil and gas companies are integrated, it's important to note that downstream processes indicate when the oil is refined, marketed, distributed, and sold. The offers that appear in this table are from partnerships from which Investopedia receives compensation.
What is downstream industry?
The downstream industry also plays a key role in other sectors and industries of the economy that may not necessarily be obvious to some, including the medical field. The downstream process has a big influence on some of the products and equipment needed and used by medical professionals.
What is the downstream business of oil?
Downstream business categories mainly include oil refining, supply and trading, and product marketing and retail.
