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Configure IIS 7 Output Caching. 7 minutes to read.In this articleby Tali SmithInternet Information Services (IIS) includes an output cache feature that can cache dynamic PHP content (or output from your Microsoft® ASP.NET or classic ASP, or other dynamic pages) in memory.
This can yield enormous performance improvements, since the script used to generate the dynamic output does not need to run for each request. The cache can vary the output that is cached based on query string values as well as HTTP headers sent from the client to the server. The cache is also integrated with the Http.sys kernel-mode driver, improving performance.
When to Use Output CachingWeb content can be divided into two main categories: static content and dynamic content. Static content does not change from request to request.
The content that gets returned to the Web browser is always the same. Examples of static content include HTML, JPG, or GIF files. Dynamic content is output that changes with every request. Examples include ASP.NET or PHP content.Between these two categories is semi-dynamic content. Imagine a dynamic ASP.NET page that executes a database query. There is no reason to execute this query on every request if the underlying database tables change infrequently.IIS automatically caches static content (such as HTML pages, images, and style sheets), since these types of content do not change from request to request. IIS also detects changes to the files when you make updates, and IIS flushes the cache as needed.The IIS output caching feature targets semi-dynamic content.
It lets you cache static responses for dynamic requests and increase scalability.Note that not every dynamic page can take advantage of the output cache. Pages that are highly personalized (such as shopping cart or e-commerce transactions) are not good candidates because the dynamic output is not likely to be requested repeatedly, and the memory used to cache the content would be wasted. Content that is output as a result of a POST type request to an HTML form is also not cacheable.The best candidates for the output cache are pages which generate data dynamically but are not likely to change from request to request based on the URL or the header information. For example, photo gallery–type applications that dynamically resize images for display in a Web page are great candidates for the output cache because caching the data saves the server from having to re-process the image resizing for each request.
Another good example of a type of application that can take advantage of the output cache feature is a stock ticker application. Select a Cache PoliciesIIS supports two types of cache policies:. varyByQuerystring, in which the URL is the same but the query string value varies. varybyHeaders, which can vary the cache based on the HTTP headers that are sent from the client to the server.Invalidate the CacheWith dynamic content, data can change frequently and you must flush the cache, letting new data be retrieved and re-cached. Note that even if the data changes as frequently as every second, it may still be useful to cache the data; a site may get hundreds of requests per second or more, and caching can reduce trips to the database to retrieve data, saving the Web server and the database server from extra work.IIS supports two ways to invalidate dynamic content:. Use a simple timeout period - the configuration property is CacheForTimePeriod.
Detect a change to the underlying resource - the configuration property is CacheUntilChange. Use this type of invalidation scheme only when you want the cache flushed when the underlying resource changes.Configure Cache WorthinessEven if you enable output caching, IIS does not immediately cache a request. It must be requested a few times before IIS considers a request to be 'cache worthy.' Cache worthiness can be configured via the ServerRuntime section described in the article.Two properties determine cache worthiness:. frequentHitTimePeriod.
frequentHitThresholdA request is only cached if more than requests for a cacheable URL arrive within the. The default setting for frequentHitTimePeriod is 10 seconds. The default setting for frequentHitThreshold is 2 hits. Configure Output Caching Through the IIS ManagerThe cache is fairly easy to configure using the user interface feature in the new IIS administration tool.From the Start menu, click Administrative Tools, and then click Internet Information Services (IIS) Manager.In the tree view on the left side, find your application.Select the Output Caching menu item.In the right column, click Add in the Action menu. You can add your output caching rule here.In the File name extension field, for example, type.php, and then select User-mode caching.Click Advanced, and then select the Query string variable(s) check box.Enter the appropriate variable(s) in the Query string variable(s) text box.Figure 1: Output caching exampleConfigure Output Caching Through the Web.config FileYou can also configure the caching feature in the local Web.config file, which is found in the content directory. Below is a sample of the configuration needed for a ShowStockPrice.asp page with a varyByQueryString parameter of. (meaning cache all unique variations of querystring parameters) and a timeout of 1 second.
If you want to cache this data in kernel for even faster performance, you just need to change the policy attribute to kernelCachePolicy. NoteMicrosoft ASP.NET already includes an output cache feature; The IIS output cache feature works in parallel with the ASP.NET cache and works for all types of applications. Check Performance CountersTo see performance in the output cache, you can look at output cache counters in the reliability and performance monitor.
From the Start menu, click Administrative Tools, and then click Reliability and Performance Monitor. (On Windows Vista® or Windows® 7, Administrative Tools is found in the Control Panel.). Select Performance Monitor in the tree view on the right, and then click + in the toolbar. Navigate to the Web Service Cache counter, and then click on it to open it.
Add the Total URIs Cached counter.If you run a performance test, you can see that the number of cached URIs increases with the number if items you request. Use Kernel-Mode CachingThe IIS output cache supports two cache policies:. User-mode output cache policy, which uses a cache that resides in an IIS worker process.
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Kernel-mode cache policy, which uses a cache that resides in Http.sys, a kernel-mode driver.Caching your content in kernel mode lets you speed Web site performance. An example of using kernel-mode caching can be found in the article.Note that there are two significant differences between user-mode and kernel-mode output cache. The kernel-mode output cache does not support modules and features that must run in user mode, such as authentication or authorization. For example, if authentication schemes like basic authentication or Windows® authentication are enabled, the cache policy does not work. The content is served but not cached. You can find more details on why responses might not get cached in kernel mode in this.
The kernel-mode output cache supports the varyByHeaders attribute, but not varyByQuerystring.Troubleshoot CachingFailed Request Event Buffering (FREB) is the best way to find out whether or not your request gets cached; you can also find out why a request is not getting cached.
iCaching 7.0
Developer: teamGiants
Description
iCaching is an indispensable tool for geocachers with a Mac. Import, organize, manage, explore, export and log your geocaches with iCaching! A native, fast Mac App.
Import
Import GPX- or LOC-files using the import button, or drag and drop them into iCaching. Import Pocket Queries directly from Geocaching.com from the Pocket Query window. iCaching also notifies you when new PQs are ready for download. Each Pocket Query will be imported into it’s own folder. iCaching also supports the Geocaching Live API. You can query geocaches from Geocaching.com using all kinds of filters.
Organize, manage and explore
Explore your geocache library with the special ‘Library’-folders. View your finds, favorited caches and so on. Sort on all properties of the caches.
You can easily add folders and organize your geocaches with drag and drop. Each cache has only one instance in the database.
The tabs under the geocache list show the different aspects of the selected geocache. The Info tab shows the metadata. In this tab you can also add your own note, corrected coordinates, like or dislike a cache and add or remove Favorites.
The description tab shows the offline description. The Webpage tab shows the geocache page on Geoaching.com. The additional waypoints (for multi’s) are show on the waypoints tab, with descriptions and a map. Logs are shown on the logs-tab. Every time you import a new version of the same geocache, new logs are added to the loglist. The last tab shows the Images that are related to the cache. You can easily export them to Garmin devices for reference ‘in the field’.’
The Map window displays geocache(s) and additional waypoints on a map. This map is interactive; select caches or waypoints on the map to view their properties in iCaching and vice-versa. You can switch between map types, including Open Street Maps.
An extended search window helps you to sort out caches by all properties of the cache. You can save your filter as a Smart Folder, for later use.
iCaching can contain multiple home- or centerlocations and calculates distance and bearing from there for all geocaches on the fly.
GCVote is build in. iCaching queries for GCVote on every import, and you can rate a cache on GCVote when you have a GCVote-account.
Export
iCaching can export to GPX, GGZ, CSV and to a lot of other file-formats You can also export directly to a whole list of GPS-devices (Garmin, Magellan, DeLorme), including paperless devices like e.g. Garmins Oregon series.
Logging
After a cache trip, easily log your finds with iCaching. You can read the visits file from your paperless GPS. iCaching also provides the ability to log Travelbugs and to add pictures to your logs.
To make usage of the entire range of iCaching functionalities you need a premium membership at geocaching.com
If you have feature-wishes or discovered something that doesn’t work as expected, please contact us! You’ll always get a response.
And of course: if you like iCaching, recommend it with a review!
In short, happy caching with iCaching!
What’s New in Version 7.0
Version 7.0 (October 2017)
New: – Geocaches close to each other appear now clustered on the map. This also vastly improves the speed of the map with large amounts of geocaches. – New Library cleanup function to easily purge archived and/or old geocaches and logs. – iCaching now uses the new round geocache icons Improved: – When importing a field notes file containing geocaches that are not in iCaching, the cache names and types are retrieved via the api – The API window now has the new API logo Fixed: – Various small issues
Version 6.6 (June 2017)
Fixed: – A change by Geocaching.com in the API responses made importing via the API crash – Sometimes the API access token was not persisted, so you had to login again and again – Sometimes the changes in the geocache note were forgotten
Version 6.5.1 (April 2017)
Improved Map:
– More informative tooltip texts – Less automatic panning of the map – You can select to center the Map on the selected cache or not; works as a toggle now – Changes of the geocache (e.g. changing corrected coords) now appears immediately on the map – The found and owned icons are back
Version 6.5 (April 2017)
New: – Support for the Touchbar on the new MacBook Pros – iCaching now remembers the open windows: Log window, Map and Homes panel. When you restart iCaching they will return. – The Map window now remembers your last settings: map type, visible map area etc. and comes back with the same settings after a restart.
Improved:
– Completely rewritten Maps window: replaced the Google Maps engine with Apple Maps which works much smoother and faster. – Pinch to zoom in the map – Show user location in the map – Re-introduced the toolbar in the Log window to make importing field notes more discoverable.
Fixed:
– Autovisit TBs only for Find logs – Small other fixes
Version 6.0.2 (January 2017)
Improved: – Visit from here (autovisit) is now the default log type for trackables in your inventory – Help descriptions regarding logging
Version 6.0 (January 2017)
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New:
– GGZ file export for modern Garmin GPS devices (implemented in ‘Export to File’). – Autovisit travelbugs. Mark your travelbug as autovisiting and it will visit all geocaches in your log batch. – Download your owned geocaches with one click from the new Library menu.
Improved:
– Download your found geocaches in a more clear way via a new dialog from the new Library menu. – Added Garmin 700 Series GPS – Write note logs for travelbugs now possible without tracking code
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