Pretty lame problem:
I have an xml file that gets updated everyday on a server. Chrome keeps on getting the original cached xml file and not the updated version. The file is hosted on azure.
Any ideas how I could force Chrome to get the latest version instead? (obviously, asking the user the clear the cache isn't an option)
Place the xml file and other similar files in a common folder. Configure the folder so that the following header is sent with any content from the folder:-
cache-control: no-cache
This should cause browsers including Chrome to re-validate any cached content before using it.
I would append something to the URL as a dummy query string, to make sure that no browser will treat it as the same resource, forcing them to load the new version. You don't need to modify the serverside script, as it can safely ignore the new query string.
For this particular application, where updates are daily, it makes sense appending today's date, like so, in the request:
/path/to/my.xml?d=20100214
That way, even if the browser caches that particular XML file, tomorrow the query string will be different and the resource will be fetched again.
Unfortunately, I know nothing about Silverlight itself, but you seem to already be able to load the file.
Related
I have seen various solutions for this approach, like adding a version number to my CSS file in index.html or adding a no-cache meta tag.
But all these solutions do not entirely fix the problem.
I want the browser to load from the cache when there is no update. But, if there is a new update, I want the browser to automatically load the fresh content from the server(that is, load the entire index.js file from the server) without the user having to reload the browser hard.
Also, my updates are sometimes not visible in the incognito mode. Why does this happen? As far as I know, there are no cache files in incognito Mode.
Usually when I make a change in a source code file the server automatically updates. Though occasionally it does not, even if I reload the page, or even close the tab and load fresh from a new blank browser tab. I have to restart the server to finally see the change. I found this out upon changing a console.log message.
Is there a way to ensure that the server is using all of the latest source files without having to restart the server? (ya as I already mentioned usually it does this automatically, but at times it does not.)
For god knows what reason, Office Add-ins on my local word client is Caching a html file that I dynamically load in (through angular) and refuses to give me a way to remove it from the cache. My only solution is to rename the file and force it to look for a new one.
I know it's a caching issue and not a code issue because when I load the app up inside the web-client it always gets the new version and not the old version.
Please help, renaming files every time I change them is stupid and time consuming
I had the same, not with Angular but JS add office add ins, cut off my webserver and still was able to load the HTML!
For me what worked was the "Clear" button under Trust Centre -> Trusted Add-in catalogues.
Perhaps this is HTML5 - something to do with you manifest, something like this in your HTML, or the equivalent automatically occurring?
`<html.... manifest="/manifest.appcache">
There are loads of suggestion for how to prevent this I haven't tried it yet, but this looks like it contains reasonable examples to test - if imparted in an unusual manner!
http://alistapart.com/article/application-cache-is-a-douchebag
Second option which is now working a treat for me!
In internet Explorer go to Internet Options -> General tab -> Settings -> Temporary Internet files -> tick "Every time I visit the webpage". Naturally this only works for locally hosted sideloading apps.
Oddly enough IE seems to be the object loaded in Office 2016, not Edge, although I have had an Edge message appear in my side-load space, I'll try and grab a shot of it next time I see it (it was during an error it appeared!).
There are a few tricks that might work like this:
What does appending "?v=1" to CSS and Javascript URLs in link and script tags do?
Or in CSS like this:
https://css-tricks.com/can-we-prevent-css-caching/
Today (Win 10 1903 and newest Office 2016) Office AddIns are using Edge as WebViewHost. The WebViewHost seems to store the cached files here:
dir /s %LOCALAPPDATA%\Packages\Microsoft.Win32WebViewHost_cw5n1h2txyewy\AC\#!123\INetCache\
In our case we are using Azure App Service (IIS) as backend for our Office AddIn.
And we added the following web.config setting to let the client re-validate all cached files on each access:
...
<system.webServer>
<staticContent>
<clientCache cacheControlMode="UseMaxAge" cacheControlMaxAge="0.00:00:00" cacheControlCustom="must-revalidate" />
</staticContent>
...
Of course, the cacheControlMaxAge may be adjusted to your needs.
Hitting Ctrl + Shift + F5 helped for me.
An easy workaround for this would be to append some random query string at the end of the url, thus making sure your browser has a cache miss.
For example, instead of getting the file http://myaddin/myfile.html, append a big enough random query string parameter so that you instead query for http://myaddin/myfile.html?cache=s98sj398nf03984jf3498n.
I am writing a program in C that acts like a proxy server in a Linux system: Client asks it for a web page,
it sends an HTTP GET Request to a distant server, and it gets the servers response (web page), which is saved in an .html file.
Here goes my problem: Most web sites got some references to images, so when i try to view the .html file proxy created, the images don't appear.
I have searched a lot, but found nothing..Is there a way to write some code to GET images too?
Thank you in advance
You're going to have to write code that parses the HTML file you get back and looks for image references (img tags), then queries the server for those image files. This is what web browsers are doing under the hood.
You have an additional problem though which is that the image references in the HTML file are to the original server. I'm assuming that since they don't load for you the server that returned the original HTML isn't available. In that case after you get each image file you will need to give it a name on the local filesystem and then alter the reference in the HTML (programmatically) to point to your new local image name.
So for example:
<img src='http://example.com/image1.png'>
would become
<img src='localImage1.png'>
If you're querying arbitrary websites then you'll also find that there are various other files you'll need to do the same with like CSS files and JavaScript files. In general its hard to mirror arbitrary web pages accurately - browsers have complex object models they use to interpret web pages because they have to deal with things like CSS and Javascript and you may need to be able to 'run' all that dynamic code to even be sure what files to download from the server (e.g. JavaScript including other JavaScript etc).
I'm assuming the issue I'm having is related to caching. Code changes I make are not getting picked up when I debug. Most times I get served a previous version of the app. How do I prevent this from happening?
Ctrl+F5 is an easy way to refresh a page and clear the cache of that page at the same time - it may help :)
Try to add to the page that hosts Silverlight application on Page_Load:
Response.Cache.SetExpires(DateTime.Now.AddSeconds(-100));
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Append a "version" querystring to your XAP Url, something like:
http://localhost:1234/ClientBin/my_silverlight_app.xap?v=1.0.287.5361
This will trick the browser (and many web servers) to think that this is a different file. And when the cache problem appears again, increase the number.
If you then want to employ proper caching, do it on the server-side with OutputCache directives.
As far as I see, this seems to be a problem with Firefox - when I used IE8, this didn't happen to me (I realize this may open its own can of worms, but at least for debugging and testing Silverlight, IE is much better)
I have not had any issues with Silverlight assemblies getting cached - you might want to try debugging the HTTP requests that go back and forth, to see if maybe your server is instead returning incorrect information to the browser (e.g. a "not modified" response).
For general no-cache behavior, the only reliable method I have found is to turn off caching in the browser.
For IE, this has been the only reliable option - otherwise, even if proper no-cache headers are sent, certain things are still cached (specifically, dynamically loaded resources which are accessed via Javascript XmlHttpRequest). I have not specifically had issues with Silverlight getting cached when it should not, though - IE has always loaded the latest updates even if cache is enabled.
Firefox has been much more problematic - even when disabling cache, it still sometimes caches XmlHttpRequest-loaded resources. Manually hitting Refresh a few times has been the only solution in such a case. Once again, I have had no issues with Silverlight assembles, even if cache is turned on.
In Firefox, I use the 'web developer' plugin and simply select to 'disable cache'. Works fine.
Firefox 3.5 under Tools has the option for Private Browsing. Click that to disable caching.
Here is how I have done it for flex/flash and silverlight and it works.
Code Behind ASPX or CSHTML
string slUrl = "/ClientBin/MySilverlight.xap";
string filePath = Server.MapPath(slUrl);
FileInfo info = new FileInfo(filePath);
// this will force browser to
// re download file if file was
// updated
slUrl += "?t=" + info.FileWriteTime.Ticks;
ASPX or CSHTML
<embed ....
src="<%= slUrl %>"
..
/>
Trick is you have to change url by adding something after ? and make a new arbitrary random query string or use file write time, and for browser, something?t=1 and something?t=2 are two urls and it will not pickup cache if t changes.
Instead of write time, you can also choose any standard config value or you can even simply hardcode your ASPX or HTML and append something after ? that will force browsers to download silverlight xap file again.
<embed ....
src="/ClientBin/MySilverlight.xap?something-different-each-time"
...
/>