Iis Response Cache

Local Cache is a very useful feature and a hidden gem of Azure App Service. SYS Kernel Mode Response Cache". Add the header by going to "HTTP Response Headers" for the respective site. There is no firewall or anything between me and the server, so IIS itself must be adding these headers and replacing mine. A small library bringing caching options, similar to MVC's "OutputCacheAttribute", to Web API actions. Notes, caching. With rich features, good performance, and major security improvements in the last few incarnations, opting for IIS might come naturally, especially when you need to host your website under Windows. 1 home page and then look for links to the information you want. When complete, IIS will be configured to serve static content (such as. IIS picks up requests from http. You can check your response headers in chrome dev tools, make sure you disable cache. This individual would load a dataset from the Cache object into a local object to use to perform processing. DNS cache poisoning is a type of DNS spoofing attack where the attacker stores fake data in a DNS resolver cache. Hope I don't take one year to post a new entry on this blog! :-) Best wishes PS: by the way, found the tutorial to setup JMeter here. So you've updated your site and now you realise that some clients can't see the changes of images/css because they all retain the same names as the old version? Well in IIS you can change the Content Expiry Header to force the client to get the latest versions of the files. Content is served to visitors using Azure Akamai CDN offering. A web server sends a HTTP/304 in response to a Conditional Validation request, indicating that the client's copy of a resource is still valid and that the resource in question was Not Modified since the client cached its copy. Cache-Control is supported by all modern browsers so that’s all we need. This element also allows you to configure whether IIS caches page output in user mode, kernel mode, or both and what, if any, output caching limits you want to impose. Net application running on IIS. This command will delete the page cache and not show the visited page contents even with the Back button. cache file extension is used to store cache information for a variety of different Internet browsers. 7 of [2]) has received a request containing an Authorization header and a response from relaying that request, it MUST NOT return that response as a reply to any other request, unless one of two Cache-Control (see section 14. We have a website that is hosted on a IIS 7. Output caching is a way to cache a specific page or some part of the page and whenever a request comes for that specific page, if that is available in output cache, it gets delivered from there. NET apps Handled exceptions & Response. SYS Kernel Mode Response Cache". has made Google PageSpeed available on Microsoft IIS. Clear Client Browser Cache with IIS. It is also passed the text status of the response. After googling this, it looks like the best bet to change the scriptFileCacheSize to 0 because this is what it says. Given that the response to a product category request will be identical throughout the day every time a call to your API is made, it would be sufficient to cache your API response for the day. I want to store the data in the form of cache. The Cache-Control User Interface is somewhat hidden behind the "HTTP Response Headers" icon. Many users also clear their cache when they close their browser. So, there's no need to worry about removing this. Mit einem OTTO Gutschein kannst du in beinahe allen Bereichen des Lebens sparen: Von Fashion über Möbel bis zu Multimedia. The variable int represents the number of precompiled script files to cache. js application to generate a fresh request. The possible. max-age=seconds—The amount of time the system considers an object to be fresh. It's becoming increasingly important for web-based applications to be accessible offline. Its value indicates the upper limit to staleness; when the cached response is. Custom response caching in ASP. If the output cache is disabled, the Cache-Control header is set to private,max-age=0. The server can include an ETag in its response, which the browser can then use this in a future request (after the file has expired) to determine if the cache contains a stale copy. sys response cache. Either a native module in the pipeline has modified an HTTP_DATA_CHUNK structure associated with a managed post cache substitution callback, or a managed filter has modified the response. Expires) used to specify response caching policies. " During some troubleshooting I noticed that if I open the XML file locally on the Windows IIS server, the file is current. Mastering HTTP Caching - from request to response and everything Using CDNs has long been something in the domain of the Alexa top 100; something a small(er) website does not need or cannot afford. 1), and some are set by the administrator of the cache (either the user of the browser cache, or the proxy administrator). If the IIS kernel cache is checked with netsh http show cachestate again, the cached 200 response is replaced with a 304 response. At the very first, "Happy New Year " to all. IIS/URL Rewrite seems to be working fine, since other browsers get proper HTTP responses and work as expected. How to Modify Caching Behavior in Internet Explorer 10 Taylor Gibb @taybgibb October 30, 2012, 2:00am EDT Caching is term used a lot when it comes to technology, here's a brief introduction to the subject as well as some tips on how to view and edit cached file settings in Internet Explorer. A kernel-mode web driver (http. config based approach. If the same URL is requested twice within 10 seconds (the default value for the ActivityPeriod registry entry located at: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Inetinfo\Parameters) the IIS worker process tells Http. It’s simple but useful 🙂. Caching improves process requests and increases response times for frequently requested data from the IIS Web server. NET Web API CacheOutput. A web server is responsible for providing a response to requests that come from users. 2 Cache Size Limits Cache size limits can prevent cache utilization from exceeding available memory resources. SetCacheability(HttpCacheability. Redirect, HttpWebRequest throws a Web Exception for 404s, 401s, and other non-200 responses, ttpResponse. 19 January 2008 - ASP. We have seen 100% performance boost in response times for our applications (response time went down from ~250ms to ~120ms) and have not seen storage connection failure issues. A reverse proxy is a gateway for servers, and enables one web server to provide content from another transparently. The following Cache-Control response directives allow an origin server to override the default cacheability of a response: public Indicates that the response MAY be cached by any cache, even if it would normally be non-cacheable or cacheable only within a non- shared cache. Use this line of code in the load event. When subsequent requests arrive for the page, the server sends the cached response instead of re-processing the page. Efficiently using the browser cache can improve end user response times and reduce bandwidth utilization. 1> Some servers will not compress their first response for a given file; they serve the first response uncompressed and compress the response in parallel and cache it for the next request 2> You may have a proxy between you and the server which is decompressing the response. That makes great sense to me! Setting a browser cache expiration tells the visitor’s browser that is is okay to cache the content – so upon the next visit the browser will load the content […]. SYS Kernel Response Cache IIS 6″, you will inevitably find a large body of literature repeatedly talking about how the kernel mode response cache effectively improves performance and. Check "Enable content expiration" and choose when your content should expire. Server (application) stores result of processing in cache. Redirect, HttpWebRequest throws a Web Exception for 404s, 401s, and other non-200 responses, ttpResponse. HttpCachePolicy class. The minimum set of HTML headers to disable browser caching that works across the most important browsers: Cache-Control, Pragma, Expires. Clear CRL & OCSP Cache Windows By default, Windows caches Certificate Revocation Lists (CRL) and CA certificates to quickly verify certificate chains. 1 specifications and supersedes previous headers (i. 1> Some servers will not compress their first response for a given file; they serve the first response uncompressed and compress the response in parallel and cache it for the next request 2> You may have a proxy between you and the server which is decompressing the response. This element also allows you to configure whether IIS caches page output in user mode, kernel mode, or both and what, if any, output caching limits you want to impose. 4, it received the XMLHttpRequest object). It's becoming increasingly important for web-based applications to be accessible offline. 5, 10 and ASP. It does so with the Server header in the HTTP response, as shown below. After these changes were made, the service could handle of 100 + clients and CPU usage flattened out at 30%. Hi, I've a question on clearing cache on IIS. /css, /js, etc. 0) through HTTP Post or any other method. 0 on Windows Server 2003 is the "HTTP. Cache-Control server-response headers offer many more options than simply an absolute or relative time until expiration. Helicon Ape provides support for Apache. If the request is authenticated or secure (i. I'd actually changed the name of one of my classes from HomePage to HomePageViewModel. Dramatically reduce Web application response time by leveraging native HttpCacheModule in IIS 7. Our site 1. Web administrators who use Internet Information Services (IIS) may need to periodically disable the caching of content that changes frequently. Im curious if there is any specific configuration that has to be done on an IIS web server to serve up RESTful web services. On the Windows server select the Internet Information Services (IIS) Manager application from the icons in the bottom bar or click the Windows icon and select "Server Manager". Is there a difference in accessing the Cache of an application when calling HttpRuntime. IIS Server Web Server 2008 32Bit running ASP Classic pages may need more memory than your system has to offer. Be it a simple HTML page or an ASP page it randomly starts caching pages and no matter what changes I make (even deliberately putting parse errors in the files) it still serves the same page. Using W3 total cache I have experimented with all different kinds of caching - nothing seems to make it any better. When subsequent requests arrive for the page, the server sends the cached response instead of re-processing the page. Demonstration of Shared Hosting Deployment with ARR. No cache info, browser asks server each time if file has to be updated. It literally implements Apache configuration model and nearly all Apache modules in a single IIS add-on, not only making IIS compatible with Apache, but also extending it`s functionality by a number of highly essential features. NET Core using the new configuration pattern replacing the old web. IIS supports HTTP , HTTP/2 , HTTPS , FTP , FTPS , SMTP and NNTP. Caching is the best way to boost web application performance and reduce load of both application (IIS) and data servers (SQL Server) Static content cache (caching data in client's browser) Page response cache (caching data on server/client side) Data cache (caching data on server side) 1. naga poker # re: Adding Output Caching and Expire Header in IIS7 to improve performance. It works 100% of the time in Chrome, it seems problematic with IE11 the most. If sliding expiration is enabled (which it is by default in Visual Studio), the moment a postback occurs within your C# ASP. Caching in ASP. 0 other than following changes I can think of. net core web application are: response caching, which adds cache-related headers to responses, to reduce the number of requests a client makes to your web server; compressing response using gzip to reduce its size. In the left-hand tree menu, click on “Sites” to show the list of sites on the right side. I have installed Oracle 10g in Linux Red Hat. RFC 5861 HTTP stale controls May 2010 When used as a request Cache-Control extension, its scope of application is the request it appears in; when used as a response Cache-Control extension, its scope is any request applicable to the cached response in which it occurs. For web servers other than Apache or IIS this value has to be set manually. However, the kernel-mode cache of IIS 7. NET page, in memory after a browser requests it. A Brief Introduction to IIS. 13 Caching in HTTP. If multiple identical requests are made using the same cache, which is not yet populated, one request will be made to the server and remaining requests will return the same response. This entry was posted on March 31, 2009 at 5:25 pm and is filed under web development with tags cache, cache won't clear, iis, iis cache, internet information server cache. Help Request Cache not cleared in IIS IIS so it doesn't cache index. CacheOutput will take care of server side caching and set the appropriate client side (response) headers for you. CacheControlMode. Response A message plus headers sent by the server in response to a request for a resource. Click Proxy. We can see this response has been sent from IIS, per the "Server" header. There is no firewall or anything between me and the server, so IIS itself must be adding these headers and replacing mine. If you are still speed hungry - install w3 total cache. Tip: Setting a page for 1 hour of caching is done in this code. IIS caches everything it can to save CPU cycles wherever possible. Set Up an IIS Response Header it is helpful to set up a response header if you have multiple Web front ends (WFEs). From a performance optimization perspective, the best request is a request that doesn't need to communicate with the server: a local copy of the response allows you to eliminate all network latency and avoid data charges for the data transfer. IE Response. Where Are IIS Log Files Located for IIS 7. Unfortunately removing the ETag response header is not an easy task on Windows Server IIS web servers. Next time you do a full refresh, it should get the files from the hard drive and not the cache/memory. Many users also clear their cache when they close their browser. I have also set the HTTP Response Header to expire the content emediatly. 13 Caching in HTTP. a second server that has Cache installed on it. All HTTP response status codes are separated into five classes (or categories). Expires: -1. IIS and Url-Rewrite: rewriting the outbound response contents pcociuba on 09-10-2019 03:06 AM In this third installment, we will review the configuration of the ReverseProxy rule to allow the correct re-writting of. sys) and in user-mode memory space (IIS worker process). netframework 1. The value of this counter increases when IIS cannot locate requested content in either the HTTP. And re-started the application by updating web. 9secs with a 94 google pagespeed score and 90 on yslow. Check the option Enable proxy. Although our software does not directly collect any personally identifiable information from visitors to your site, LiteSpeed may still be considered a data processor, as user information may be temporarily cached and/or logged, as outlined in this document. 3> You may have client software (e. Step 1: Now go to the Default Web Site then Add Application and here provide the alias name and select the Application Pool name and provide the physical path of the Web Application. I've done changes on CSS, Images, Script files,. If a new user requests the very same webpage located in the cache, IIS will send the copy from its cache without reprocessing the contents. 0 has a very powerful output caching infrastructure, which can cache response data in kernel-mode (http. Here's a development tip I came across on one of the ASP. The Cache-Control User Interface is somewhat hidden behind the "HTTP Response Headers" icon. I am getting a max-age of 9999999 and TWO Cache-Control headers. You can also use the ResponseCacheAttribute in MVC to decorate Controllers and Actions if you are returning data which is safe to cache. 0 on Windows Server 2003 is the “HTTP. Application Request Routing (ARR) is a real nice httpmodule for IIS, that is not as well known as it should be. com ) Last year I attended the San Francisco WordCamp because I wanted to see what the Core WordPress team had to say about WordPress Hosting on Windows. sys response cache. Items collection, which is a key/value store that is created for each individual request to an ASP. net version and MVC version. Maximum cache size is the maximum size, in megabytes, of the output cache. After doing a little bit of research I applied the below security headers to multiple sites running in Server 2012 and Server 2003. If you build, maintain or tune web sites you’ll know about the browser cache and how to control caching using HTTP response headers. Currently using fiddler i am able to see HTTP response header as: Cache-Control: no-cache. If set to 0, no script files are cached. You can modify the thresholds for this monitor. 5, 10 and ASP. This will tell Cloudflare to cache the object for 200 seconds and the browser to cache the object for 60 seconds. And re-started the application by updating web. SetCacheability method. IIS6 had user-mode file cache, token cache, URI cache, metadata cache and kernel-mode http. htpasswd configuration files in Microsoft IIS. You can override these defaults as described in the answers below. More Information The HTTP. This article describes how to set the value of the Cache-Control HTTP Header by using Active Server Pages (ASP), as well as the metabase property CacheControlCustom. – maz May 4 '17 at 13:03 |. Content is served to visitors using Azure Akamai CDN offering. Hi, I've a question on clearing cache on IIS. And re-started the application by updating web. It's becoming increasingly important for web-based applications to be accessible offline. However, since JSONP and cross-domain GET requests do not use XHR, in those cases the jqXHR and textStatus parameters passed to the success callback are undefined. 1> Some servers will not compress their first response for a given file; they serve the first response uncompressed and compress the response in parallel and cache it for the next request 2> You may have a proxy between you and the server which is decompressing the response. Tip: Setting a page for 1 hour of caching is done in this code. The StripHeaders module is a Native-Code module for IIS 7. 0 and above have a "smart" cache, which lets site owners and developers configure the output cache to cache separate copies of responses based on query string value. When you enable output caching, IIS will keep a copy of requested webpages. However, common HTTP caches are typically limited to caching responses to GET and may decline other methods. First the OCSP Responder determines if it has any cached responses for the same request. The kernel cache key is used to invalidate // the entry if a dependency changes or the item is flushed from the // managed cache for any reason. Pragma: no-cache. How to Enable Output Caching on IIS? Internet Information Services (IIS) 7. Caching is extremely important for performance boosting in ASP. Remove HTTP response headers in IIS 7, 7. sys response cache. "Instead, the kernel mode listener is able to receive the connection request, receive the new connection, check the kernel-mode cache, and serve the response from the cache on a cache hit. The server can include an ETag in its response, which the browser can then use this in a future request (after the file has expired) to determine if the cache contains a stale copy. After doing a little bit of research I applied the below security headers to multiple sites running in Server 2012 and Server 2003. Many users also clear their cache when they close their browser. Microsoft IIS Server is one of the most popular web servers for Windows-based servers. Internet Information Services (IIS, formerly Internet Information Server) is an extensible web server created by Microsoft for use with the Windows NT family. If multiple identical requests are made using the same cache, which is not yet populated, one request will be made to the server and remaining requests will return the same response. Maximum cache size is the maximum size, in megabytes, of the output cache. Do not enable all the features. A read/write string value that specifies an HTTP 1. Internet Information Services (IIS) serves no less than a third of all websites out there. Either a native module in the pipeline has modified an HTTP_DATA_CHUNK structure associated with a managed post cache substitution callback, or a managed filter has modified the response. This header is only sent for the request from localhost. Website Performance with ASP. NET, Classic ASP, or FastCGI application, freeing up its threads to dequeue more requests. NET and ASP Web applications. NET today and I've been having a problem with IIS caching files that have errors in them. use IIS output caching or WP-SuperCache. It will not insert undefined values into the cache. The impact of a maliciously constructed response can be magnified if it is cached either by a web cache used by multiple users or even the browser cache of a single user. Microsoft Azure is an open, flexible, enterprise-grade cloud computing platform. For web servers other than Apache or IIS this value has to be set manually. x! cache_timeout: connection_pool_timeout: 0: This directive has been deprecated since 1. View HTTP Response Header This tool allows you to check status code, response headers, redirect location and redirect chain of a HTTP connection. Unfortunately it doesn't. An entry in the cache is helpful only when it is used. This chapter describes how to enable IIS HTTP Compression on a Windows 2008 Server and Windows 2012 Server. Its value indicates the upper limit to staleness; when the cached response is. Cache-Control directives control who can cache the response, under which conditions, and for how long. From a performance optimization perspective, the best request is a request that doesn't need to communicate with the server: a local copy of the response allows you to eliminate all network latency and avoid data charges for the data transfer. Cache-Control private says that it's OK for the client to cache the page, subject to its expiration date. Also note a @ChromiumDev's tweet : Chrome DevTools' Disable Cache invalidates the disk cache (great for developing!), but. Be it a simple HTML page or an ASP page it randomly starts caching pages and no matter what changes I make (even deliberately putting parse errors in the files) it still serves the same page. For web sites, speed may be feature #1. There is no firewall or anything between me and the server, so IIS itself must be adding these headers and replacing mine. I keep my blog content on Azure blob storage. Although our software does not directly collect any personally identifiable information from visitors to your site, LiteSpeed may still be considered a data processor, as user information may be temporarily cached and/or logged, as outlined in this document. I want to remove this and wanna set Cache-Control: private. In Chrome, using dev tools, I can see that header is well set in response: Cache-Control: max-age=21600 But I still get 98 requests. Some really easy ways to improve performance in your asp. This screenshot shows the contents of the Firefox disk cache and the Cache-Control: Public response header in HttpWatch: Myth #6 - SSL Certificates are Expensive If you shop around you can find SSL certificates for about $ 10 a year or roughly the same cost as the registration of a. sys) and in user-mode memory space (IIS worker process). Using W3 total cache I have experimented with all different kinds of caching - nothing seems to make it any better. Check the option Enable proxy. Dynamic Caching and Compression. I've Web Cache 10. This allows an origin server to state that the specified parts of the response are intended for only one user and are not a valid response for requests by other users. Use ARR as an edge/child cache node. Cache is complex and confusing in ASP. If the same URL is requested twice within 10 seconds (the default value for the ActivityPeriod registry entry located at: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Inetinfo\Parameters) the IIS worker process tells Http. If the headers indicate that content should not be cached then it won't be. Demonstration of Shared Hosting Deployment with ARR. internal override string SetupKernelCaching(int secondsToLive, string originalCacheUrl, bool enableKernelCacheForVaryByStar) { string cacheUrl = _cacheUrl; // if we're re-inserting the response into. This way the user sees previously cached response immediately and in the same time, the server still processes the request in the. IIS: 54,000+ req/sec IIS running a static index page in a published application. Here is how you can make a test/sample managed-module and place it in the GAC (code sample is placed at the end of this blog). That's it! IIS tells the client with the "Cache-Control" header that the content may be cached on the client. The cache is fairly easy to configure using the user interface feature in the new IIS administration tool. This is why the example response above has pragma: no-cache and the Expires header set in distant past. Is there a difference in accessing the Cache of an application when calling HttpRuntime. – maz May 4 '17 at 13:03 |. For web servers other than Apache or IIS this value has to be set manually. NET and ASP Web applications. Help Request Cache not cleared in IIS IIS so it doesn't cache index. The IIS output cache is a feature that makes it possible to cache entire responses in memory, even from dynamic content. 0 has a very powerful output caching infrastructure, which can cache response data in kernel-mode (http. IIS Application Request Routing (ARR) 3 enables Web server administrators, hosting providers, and Content Delivery Networks (CDNs) to increase Web application scalability and reliability through rule-based routing, client and host name affinity, load balancing of HTTP server requests, and distributed disk caching. I want to remove this and wanna set Cache-Control: private. How To Add a CORS compliant HTTP Response Header to IIS Windows Server 2012 R2 In our case we will add the 'Access-Control-Allow-Origin' HTTP Response header. In the first part we looked at what IIS Application Request Routing is, how it works, and went through its installation. 1, and is ignored by some caches and. NET response. Luckily there is a solution. 1 clients SHOULD NOT send the PRAGMA request-header. 0 (Vista/Server 2008), introduced Kernel Mode authentication for Windows Auth (Kerberos & NTLM), and it's enabled by default on all versions. For IIS the default value is 10. Post cache substitution is not compatible with modules in the IIS integrated pipeline that modify the response buffers. HttpContext. The IIS output cache is a feature that makes it possible to cache entire responses in memory, even from dynamic content. If a web server responds with Cache-Control: no-cache then a web browser or other caching system (intermediate proxies) must not use the response to satisfy subsequent requests without first checking with the originating server (this process is called validation). config file to send HTTP Security Headers with your web site (and score an A on securityheaders. 0 provides the fastest performance for static and dynamic Web content through powerful HTTP compression and deeper integration with request serving from the Windows kernel for SSL Web sites and Windows authentication. Following the above will already have boost your performance. NET Web API CacheOutput. Caching is important feature of application, it helps for improving speed of IIS response time by taking copy of a webpage visited by most recent user. In some instances a CACHE file can be used to pull up an image of a cached website when the user's computer is not connected to the Internet. HTML5 addresses some of. 0 that stores all application outputs in Kernel mode cache. If the same header is provided in the response, the value of this response header will be used to replace the session. If you're like me, you may have wondered too. In a web server like IIS you can then set the Cache-Control header at the folder level through the IIS Admin applet. Microsoft IIS Cache Control. Client-server request/response interactions are covered, and some max-age watch-outs are also detailed. the authentication data cache. It's the highly performant server level cache that very efficiently delivers frequently used content. I would like to know how to use Database Trigger to invalidate a Cache in asp. With rich features, good performance, and major security improvements in the last few incarnations, opting for IIS might come naturally, especially when you need to host your website under Windows. Caching best practices & max-age gotchas Posted 27 April 2016 - this post was brought to you by: procrastination! Getting caching right yields huge performance benefits, saves bandwidth, and reduces server costs, but many sites half-arse their caching, creating race conditions resulting in interdependent resources getting out of sync. This article, by Scott Mitchell, shows how to remove unnecessary HTTP response headers in IIS and ASP. Im curious if there is any specific configuration that has to be done on an IIS web server to serve up RESTful web services. Close(); did not resolve the issue. Select Server Variables and then add a new Server Variable called RESPONSE_SERVER. Our site 1. Cache-Control User Interface. NET web applications and IIS, regarding sliding expiration. I also checked that output caching was indeed enabled in the Internet Information Services (IIS) Manager, and the maximum file size was reasonable (it defaults to 256KB, which is fine for our usage) All this was fine. However, common HTTP caches are typically limited to caching responses to GET and may decline other methods. SetCacheability(HttpCacheability. Verify the option Reverse rewrite host in response headers is enabled. Select the main tree node (server name) > Application Request Routing Cache (double-click) > Server Proxy Settings. If you build, maintain or tune web sites you’ll know about the browser cache and how to control caching using HTTP response headers. IIS logs contain detailed information about user traffic, including content requests, client access IPs, response codes, client errors, server errors and response times. The Cache-Control User Interface is somewhat hidden behind the "HTTP Response Headers" icon. 3> You may have client software (e. js application to generate a fresh request. 4mb loads in just 1. It is also passed the text status of the response. HTTP Response headers are name-value pairs of strings sent back from a server with the content you requested. I'll cover the following topics in the code samples below: Windows Server, DateTime, ASP. Its value indicates the upper limit to staleness; when the cached response is. Cache? I "think" I remember reading about a difference in the two a few years. NET, classic Active Server Pages (ASP), PHP, or other dynamic pages). Different kinds of caches. 0 that stores all application outputs in Kernel mode cache. Yes, all browsers can cache pages and resources for long periods if told to do so, but the browser can kick individual items out of the cache at any point to make room for other things. 0 is a physical memory-based cache and the cost of an entry is the memory that it occupies. This tutorial will walk you through the steps of disabling browser caching for a web page. 0 and above. Any user trying to access a web page stored on the cache server is sent the stored version, instead of downloading the web page again. Sets whether a proxy server can cache the output generated by ASP or. in IIS or Nginx), or use a third party provider like CloudFlare. It consistently serves read and write requests within single-digit milliseconds, delivering exceedingly fast cache operations to scale data tiers as application loads increase. It does so with the Server header in the HTTP response, as shown below. IIS also detects changes in updated files and flushes the cache as needed.