Downloading file from XHR(URL with authentication headers)

[vinayk]

Hello. I am trying to implement downloading in CEF
What I am trying to achieve is: how to let CEF handle the download when a fetch request/XHR request is made in JS.
I tried downloading the entire file in JS and create an ObjectUrl and clicking on it will call download handler of CEF and it shows the file picker and writes to file from memory but the problem is memory bumpup in case of huge files. I would ideally want CEF to download files when a fetch/XHR request is made(there are some authentication headers). What is the ideal way to do this in CEF and please point me in that direction. Also is it possible to show an open file dialog for multiple downloads and let CEF handle the downloading and multiple files with same name cases? I can't find any way to do this. What I understand is we need to show separate save-as dialogs for all the files downloaded as a group. Can we do any better than this??

Thanks in advance.

[magreenblatt]

Why do you want to download fetch/XHR requests specifically? If your intention is to view these requests you might want to use the DevTools Network tab instead.

You can also implement your own download manager logic by using CefDownloadHandler.

[vinayk]

I have to download a file from a server. We have to pass authentication headers along with the request.
So we can't click on the URL and ask CEF to download it.
I implemented download manager but I am not able to pass headers along with the request.
Is there any way to use the download manager?? Please correct me if I'm wrong, the Download manager can be invoked by pressing on a link right? Or is there any other way to invoke it from js.
Also is there any way to save a streaming response to stream writer in CEF??
Thanks

[amaitland]

https://magpcss.org/ceforum/apidocs3/projects/(default)/CefBrowserHost.html#StartDownload(constCefString&) can be used to trigger a download in code.

[vinayk]

Thanks, amaitland.
But the Start download function will download from an URL string but how do I pass authentication headers along with it??

[amaitland]

Actually doesn't look like StartDownload is triggering any of the CefRequestHandler methods, so scrap that idea.

[magreenblatt]

You should be able to add the authentication headers in CefResourceRequestHandler::OnBeforeResourceLoad after clicking the link or calling StartDownload. If you want the file contents as a stream use CefURLRequest.

[meldefern]

Are you adding the

Code: Select all

content-disposition

header to your server response?