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Summary
When you configure Internet Explorer to use an automatic proxy configuration script, it caches the proxy that is returned by the FindProxyForURL call. The caching mechanism (Automatic Proxy Result Cache) is performed on a host basis (that is, not on an URL basis). This prevents you from using different proxies to gain access to the same Web server. The following sample scenario demonstrates this behavior:
Configure a Web server that is named 'Webserver' with two virtual folders: '/login' and '/test'.
Create the following PAC file:
Configure Internet Explorer to use this PAC file.
Start Internet Explorer and type the following Web address:
http://webserver/loginInternet Explorer loads the PAC file and correctly uses a direct connection.
When the logon page appears, type http://webserver/test. If you use Network Monitor, you can observe that access to 'http://webserver/test' still uses a direct connection instead of one of the returned proxies.
More Information
The Automatic Proxy Result Cache is a performance enhancement that was added to Internet Explorer 5.5 and later. The purpose of the cache is to reduce the client-side processing of the automatic proxy configuration script. When you connect to an Internet site, the FindProxyForURL function is used to determine whether a proxy should be used and which proxy to use. Internet Explorer 5.5 and later first checks the Automatic Proxy Result Cache to determine whether a proxy was used to connect to the host on previous attempts. If this checks fails, it indicates that this is the first attempt to connect to the host during the current session and the normal proxy detection logic applies.
If an automatic proxy configuration script is configured to be used and Internet Explorer is able to retrieve it from the network (either if the Automatically Detect Settings option or the Use automatic configuration script are enabled), the Automatic Proxy Result Cache is updated with the hostname being accessed and the complete set of proxy servers returned by parsing the script. In the example, any hostname that is determined to use a proxy server will have 'PROXY myproxy:80; PROXY mybackupproxy:80' added to the Automatic Proxy Result Cache.
In this scenario, “myproxy” is used for any subsequent access to a cached hostname and the automatic proxy configuration script is not re-processed. If “myproxy” is suddenly inaccessible, the following happens:
The “myproxy” proxy is added to the list of bad proxy servers.
The “mybackupproxy” proxy is selected to serve the request for the hostname in question, taken from the Automatic Proxy Result Cache.
If the connection is successful, “mybackupproxy” is used in subsequent requests to this hostname during the same browsing session.
If all of the proxy servers returned from the automatic proxy configuration script are inaccessible, then you receive a 'Page Cannot Be Displayed' error message in Internet Explorer (which would happen if a static proxy server is suddenly inaccessible).
This allows proxy failover to still occur even if the Automatic Proxy Result Cache is enabled but it does not allow you to specify a different proxy server for the same hostname but, for instances, for different URL’s, as illustrated in the example. If this is a requirement, then you may want to disable the Automatic Proxy Result Cache feature. This will result in client-side processing of every GET request that is issued by Internet Explorer. As a result, Internet Explorer performance may be impacted depending on the logic of the Automatic Proxy Configuration Script and its size. To disable the Automatic Proxy Result Cache, use one of the following methods.
Note If you disable automatic proxy caching, Internet Explorer performance may be affected.
Method 1: Modify the registry
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
You can disable the Automatic Proxy Result Cache by using the following registry key:
HKEY_CURRENT_USERSoftwarePoliciesMicrosoftWindowsCurrentVersionInternet Settings
Value: EnableAutoproxyResultCache
Type: REG_DWORD
Data value: 0 = disable caching; 1 (or key not present) = enable automatic proxy caching (this is the default behavior)If the registry key is not present, you can create the registry key by using the following registry file:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USERSoftwarePoliciesMicrosoftWindowsCurrentVersionInternet Settings]'EnableAutoProxyResultCache'=dword:00000000'
Method 2: Modify Group Policy settings
Click Start, click Run, type gpedit.msc, and then click OK.
In Group Policy Object Editor, double-click User ConfigurationAdministrative TemplatesWindows ComponentsInternet Explorer.
Double-click Disable caching of Auto-Proxy scripts.
Click Enable, and then click OK.
You may have to use this registry key if you connect by using a proxy server that is handling secure and non-secure requests on the same server. One example of this behavior is the SQUID Proxy Server software. Because Internet Explorer typically caches port information, it may not send a secure request over the correct port number when it tries to send secure and non-secure responses to the same server, but on different port numbers.
For more information about the addition of the bad proxy server list, click the following article number to view the article in the Microsoft Knowledge Base:
320507 Internet Explorer does not retry bad proxy server for 30 minutes
Like every operating system, Windows also stores different kinds of cache files on the hard drive. In simple words, cache files are temporary files that are stored on the memory to make it easier for you to access frequently used data. The cache data utilize lots of hard drive space of your computer. Deleting cache files is necessary for the smooth running of the system. Cache memory is responsible for various kinds of computer problems, including slow processing speed, slow startup, lag or hang, application responding, and many others. If you don't know how to clear memory cache on your Windows computer then, the solution to your problem is here. Here in this post, we will talk about How to clear memory cache on Windows computers.
5 Ways to Clear Memory Cache on Windows 10/8/7/Vista/XP
It is necessary to clear cache the memory to fully utilize your CPU power. Cache memory causes lots of problems by occupying a huge amount of computer RAM (Random Access Memory). That's why it is always recommended to clearing memory cache from your Windows computer to get optimum performance. Cache memory is something that is really useful to give you better performance. It helps the application to load faster as compared to load the app without cache data. Here below are some methods that will help you to clear memory cache in Windows 10/8/7/Vista/ and XP.
Method 1: Create Clear Memory Cache Shortcut
This is one of the easiest solutions to clear memory cache on the Windows operating system. This method is completely free; you don't have to install any third-party paid tool to clear the memory cache. Below are some steps to clear memory cache on Windows.
Step 1: First of all, you have to turn on your computer and right-click on the desktop.
Step 2: Here, you will have a couple of options. Click on 'Shortcut' under the New option.
Step 3: Create a Shortcut wizard will appear, you have to click Browse to locate the directory. Or you can simply type '%windir%system32rundll32.exe advapi32.dll, ProcessIdleTasks' without quotes on the text field of 'Type the location of the item'.
Step 4: Once the above process is completed, you have to click on 'Next' button to proceed to the next step.
Step 5: Now, you have to type a name for this shortcut. Here, we are typing 'Clear Unused RAM' and hit on the 'Next' button.
Once the shortcut is created, switch to the desktop and double-click on the shortcut to clear memory cache on Windows.
Method 2: Clear General Cache
Disk Cleanup is an integrated feature of Microsoft Windows that enables the user to clean unwanted files. Getting engaging with this feature, you can remove temporary files, unwanted files, preview windows installation files, and much more. You just have to choose the disk and start the deleting process. Here below are steps to clear the memory cache using disk cleanup.
Step 1: At the first step, you have to click on the 'Start' button and type 'disk cleanup' in the search field and hit the 'Enter' button.
Step 2: Now, Disk Cleanup: Drive Selection dialog box will appear. You have to choose the drive from where you would like to clear the memory cache.
Step 3: Now, click on the 'OK' button. It will start the scanning process and shows you how much space is occupied by the cache.
Step 4: You have to tick the checkbox which you would like to clean. If you want to clean system files then, you can click on the 'Clean up system files' otherwise, hit on the 'OK' button at the bottom of the window.
Step 5: Once the above process is completed, you can click on 'Delete Files' if prompted. It will start deleting cache files from places including recycling bin, Thumbnails, and many other places.
Method 3: Clear App Data File to Clear Memory Cache
Step 1: At the first step, you have to click on the 'Start' button or hit on the 'Windows' key and click on 'Computers' to open My Computer.
Step 2: My Computer window will appear; if you don't see My Computer, then manually type 'My Computer' in the start and hit the 'Enter' button.
Step 3: Once the above process is completed, you have to click on the 'Organize' tab in the top left corner of the window.
Step 4: Then, choose 'Folder and search options' under the organize drop-down menu.
Step 5: a Folder options dialog box will appear with 3 tabs; click on the view tab.
Step 6: Now, you have to click on 'Show Hidden files, folder, and drives' radio button under the 'Hidden files and folders'.
Step 7: Click on the 'OK' button at the button of the window.
Step 8: Once the above process is successfully completed, you have to open the hard disk where windows are installed.
Step 9: Now, you have to open the 'Users' folder by double-clicking on it. Then, click on the folder with an administrator account.
Step 10: You have to locate the 'AppData' folder and open it by double-clicking and open the 'Local' folder.
Step 11: Now, you have to select the 'Temp' folder and open it.
Step 12: Remove the read-only permissions from the Temp folder.
Step 13: You have to select all files that are placed in the Temp folder. You can press 'Ctrl' + 'A' to select all files.
Step 14: Once the files are selected, Press 'Shift' + 'Delete' button simultaneously to permanently delete all temp files.
Method 4: Delete Internet Explorer Files to Clear Memory Cache
Step 1: First of all, click on the 'Start' button and type 'Internet Explorer' in the text field and press the 'Enter' button.
Step 2: Internet Explorer web browser window will appear, you have to click on the 'General' tab at the top of the window.
Step 3: Now, you have to click on the 'Settings' under the browsing history section.
Step 4: Then, click on 'View files' at the screen's bottom right side. Once the above process is completed, a new window will appear with all cached files created by Internet Explorer.
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Step 5: You have to press the 'Ctrl' + 'A' button simultaneously to select all the cache files.
Step 6: Now, you have to press the 'Shift' + 'Delete' button to remove all cached files permanently.
Method 5: Clear the DNS Cache
Step 1: Initially, you have to click on the 'Start' menu by clicking on the Start button at the bottom left of the screen.
Step 2: Now, type command prompt and hit the Enter button to launch. You can also open a command prompt by right click on Command prompt and run as administrator.
Step 3: On the command prompt, you have to type 'ipconfig /flushdns' without quotes and press the'Enter' button.
Step 4: You have to wait for a couple of seconds and be notified when completed. Once it is successfully completed, you have to restart your computer to makes changes.
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