again i failed to find that how i can use this perameter delet Cache for my selected engine can you please post the complete vb or c# code for my enginefrmStep2 and enginefrmStep4 in Form2 and Form4
it will be helpful to me
Thanks

Why hasn't this feature been investigated, or put on the development roadmap. I see countless requests to be able to do this on the forum, so there is definitely interest in having the feature available.
To be perfectly honest, having to shut down all webviews in order to clear the cache is error prone, and a shoddy work around at best.

Can we get some explanation as to why this feature request has gone ignored for the past few years now?

Thank you for the honest response, it is really appreciated. I've found the same problem to be true with the work around.
We attempt to clear our cache when our application starts and stops, in order to prevent hanging onto old versions of pages.

I've also noticed however, that developers who setup their web pages to ignore caching, still run into problems with caching, which suggests to me there is a problem with that portion of the code specifically. Maybe there is a bug in the chromium code base causing this, and its more pervasive than just EO?

I see your dilemma. It would certainly be easy to release the Async call, but it's easily a source of bugs that will be hard to resolve, since certain assumptions will be made that shouldn't happen.
Thank you for the detailed explanation, I can appreciate the complexity of the issue and I look forward to your solution.

Is there perhaps a way to load a url while ignoring the local cache?

In our application, we support users to log-in and logout. After user1 logs out and user2 logs-in, we are not getting the NeedCredential event callback to pass the new credentials. We tried to dispose WebView and create a new one. This didn't help.

We are suspecting this may be related to cached cookies. We cannot restart our application when users switch happens, this is a hard requirement. Is there a way to make this work so that the credentials are passed after a user logs in?

Also, I read about stopping the engine in this thread to clear cache. What is the relation between engine and webviews? In our application at any given time there may be multiple instances of WebBrowsers be running. Do all these run on same engine?

Hi,

There is a one to many relationship between a WebView and a Engine. An engine can manage many WebViews but a WebView belongs to exactly one Engine. The Engine manages all the WebViews and other "global" things such as cache, cookie, proxy, etc. If you want to clear those, you will need to stop the engine and then clear the cache folder. See here for more details about the engine:

https://www.essentialobjects.com/doc/webbrowser/advanced/engine.aspx

Thanks

Hi,

After you stop the engine, you will need to explicitly delete the cache folder. You can do that with this function:

https://www.essentialobjects.com/doc/eo.webengine.engine.cleanupcachefolders_overloads.aspx

You can also delete the folder yourself if you have explicitly set the cache folder. In either case, you won't be able to delete the cache folder if the engine is running.

Currently our engine does not provide a way for you to switch user context. It will always run under the same user token associate to your process. So if you dynamically switch user token through out your process's life time, it will not have any impact on the browser engine. Internally we do support creating engine under a different user context, we will look into that and see if we can expose that feature so that you can use it. If we do expose this feature, then you must explicitly create Engine object. You can not use the default Engine since the default Engine will always use your process's user token. Note this part only affect Windows authentication (for example, when your web server uses integrated Windows authentication). It does not affect proxy settings.

Chromium browser engine does try to load proxy settings from registry. However in a multi-user context you described we would not recommend you to rely on it.

An alternative approach is after user login, you create a child process under the new user's token and then everything goes off as that user from that point on. This is in fact how Windows works --- when you login through winlogon.exe, Windows establish a security context for the newly logged in user and all processes are then created under that user. This is the cleanest way to isolate multiple user since this is the architecture Windows uses. For example, by default the Engine object creates cache folder in the current user's temp directory. So if the user is switched the temp directory will also be switched (by Windows), thus you don't even need to delete the cache folder at all.

Thanks!

We tried stopping the engine with delete cache option. And restarted the engine when new user logs into our application. We still don't get the NeedCredential call back and the website still shows as the OS logged-in user and not the user logged-in into our application. Our application supports only windows users to log on, so the logged-in user is always a Windows user. Please see if there is way to set the user context when we create an engine.

Thank you for looking into this. Meanwhile, we will try with child process approach you mentioned. One question regarding this approach - if a child process creates an engine, how do we assign that engine created in that child process to the WebView running in the main process? The WebControl in our application has to be running on the main process. We are new to EO and appreciate any sample code or any help.