Help caching specific files in Cefsharp.

[quinguyenhuu]

Is there any way to cache an array of requests in Cefsharp? I want to cache all the files that have big size such as svg, js, video... and doesn't want to cache all the files that have small size. Please help.

[amaitland]

Is there any way to cache an array of requests in Cefsharp?

Not specifically no.

You can use the standard http cache headers.

[quinguyenhuu]

Thanks. I want to calculate the size of each request, and if the request size is too big, i plan to save the response to the local and then next time if the same request, I just load the response from the local instead of sending request over internet.
Are there any functions that i can override to help me solve this problem?
Please help. Thanks.

[amaitland]

That should be possible.

1. First check if the file exists on disk and return a resource handler if true.

https://github.com/cefsharp/CefSharp/wiki/General-Usage#request-interception

You can use https://cefsharp.github.io/api/89.0.x/html/M_CefSharp_ResourceHandler_FromFilePath.htm to load from disk.

2. Use a IResponseFilter to copy the response into a stream.
   https://github.com/cefsharp/CefSharp/wiki/General-Usage#response-filtering

The example shows converting the response to a string, you can write the stream to disk.

In GetResourceResponseFilter you'll hopefully have access to a response headers and be able to obtain the Content-Length to determine if the size meets your minimum requirement. Return null in GetResourceResponseFilter if you don't want to get the response body. Content-length header is optional from memory, so no guarantees that a response will have it.

Streaming video will be a problem as you won't have an entire response to load from disk.

If you need to support range requests when using a ResourceHandler then you'll need a custom implementation. I have a basic working example at https://github.com/cefsharp/CefSharp/blob/cefsharp/89/CefSharp.Example/AcceptRangeResourceHandler.cs

[quinguyenhuu]

Very thank you.

[amaitland]

You'll probably want to implement 2. first, the order I listed is just based on order of events the methods are called at runtime.

[quinguyenhuu]

yes, thank you so much.