Download partial file

There are several downsides with this approach: The server and client have to work in concert. The server has to set a cookie. The client has to detect the cookie. Cross-domain requests won't be able to set the cookie. There are limits to how many cookies can be set per domain. Can't send custom HTTP headers.

Use an iframe with URL redirection. The iframe starts a request and once the server has prepared the file, it dumps a HTML document that performs a meta refresh to a new URL, which triggers the download 1 second later. The load event on the iframe happens when the HTML document loads.

There are several downsides with this approach: The server has to maintain storage for the content being downloaded. Requires a cron job or similar to regularly clean up the directory. The server has to dump out special HTML content when the file is ready. The client has to guess as to when the iframe has actually made the second request to the server and when the download has actually started before removing the iframe from the DOM.

This could be overcome by just leaving the iframe in the DOM. The iframe triggers the download request. As soon as the request is made via the iframe, an identical request via XHR is made. If the load event on the iframe fires, an error has occurred, abort the XHR request, and remove the iframe.

If a XHR progress event fires, then downloading has probably started in the iframe, abort the XHR request, wait a few seconds, and then remove the iframe. This allows for larger files to be downloaded without relying on a server-side cookie. There are several downsides with this approach: There are two separate requests made for the same information. The server can distinguish the XHR from the iframe by checking the incoming headers. If the server waits to send headers until the file data is ready, the XHR can roughly detect when the iframe has started to download even without CORS.

The client has to guess as to when the download has actually started to remove the iframe from the DOM. Can't send custom headers on the iframe. CubicleSoft CubicleSoft 1, 15 15 silver badges 18 18 bronze badges. Elmer Elmer 8, 1 1 gold badge 44 44 silver badges 35 35 bronze badges.

Still has the issue of switching window and returning which will cause the modal to hide. JQuery is supported but not required. Community Bot 1 1 1 silver badge. Jorge Paulo Jorge Paulo 3 3 silver badges 4 4 bronze badges. Art Geigel Art Geigel 1, 3 3 gold badges 19 19 silver badges 23 23 bronze badges.

MB33 MB33 71 1 1 silver badge 1 1 bronze badge. It's works perfectly. Thanks for this beatiful sample. I'm very late to the party but I'll put this up here if anyone else would like to know my solution: I had a real struggle with this exact problem but I found a viable solution using iframes I know, I know. It's terrible but it works for a simple problem that I had I had an html page that launched a separate php script that generated the file and then downloaded it. Walker Boh Walker Boh 6 6 silver badges 13 13 bronze badges.

If the file is ready, do the download. If the file is not ready, show the progress. That sounds like the temporary-file approach I mentioned above.

I might do something like this if it turns out my idea is impossible, but I was hoping to avoid it. Vladimir Salguero 4, 2 2 gold badges 37 37 silver badges 42 42 bronze badges.

Manuel Larrota Manuel Larrota 2 2 silver badges 5 5 bronze badges. Works but basically transforms data to Base64 on the memory before reconverting to binary and downloading. Not recommended for large files — Erdal G. How can I set the final downloaded filename to the filename which is fetched from url?

In my experience, there are two ways to handle this: Set a short-lived cookie on the download, and have JavaScript continually check for its existence. Only real issue is getting the cookie lifetime right - too short and the JS can miss it, too long and it might cancel the download screens for other downloads. Using JS to remove the cookie upon discovery usually fixes this.

Not only do you know exactly when the file download finishes, if you use XHR you can use progress events to show a progress bar! The problem with this method is that iOS Safari doesn't seem to handle downloading blobs right - you can convert the blob into a data URL with a FileReader and open that in a new window, but that's opening the file, not saving it.

Sora Sora 6 6 silver badges 19 19 bronze badges. I should clarify -- I"m not too concerned with when the download completes. If I can just identify when the download starts, that would be enough. So here is what I do: Target the hidden iFrame as usual. Generate the content. Cache it with an absolute timeout in 2 minutes. Send a javascript redirect back to the calling client, essentially calling the generator page a second time.

Remove the content from the cache and send it to the client. Here is what the codebehind looks like, which is all you really need. QueryString[ "data" ]! Write "Javascript to tell user there was a problem. Windows 10 Vs Windows Visual Studio Vs Visual Studio C Evolution. Getting Started With. NET 6. Understanding Matplotlib With Examples. It provides temporary benefit payments to employees that are fired without any reason or forced to quit. You are paid unemployment benefits for only a few weeks.

These differ based on the state in which you reside until you find another job. Sometimes, it could be hard to find another job as several unemployed people have no work for a year or more. Based on these tough economic times, the federal government has passed several extensions that make unemployment benefits available for a longer period.

These unemployment benefits provide a partial replacement for lost wages. The amount that you receive would be based on what you had earned. States have different formulae to calculate benefit payments but all states would take your prior earnings into account. To qualify for unemployment benefits the state would have to examine the past wages requirements, the reason for unemployment, and availability to work.

States have an upper limit on the total weekly benefit amount. It means that there is a common formula to pay half of what the employee used to earn. In a way, this would be up to a cap that is tied to the average earnings in that state. So the employees with a higher wage would receive huge benefits checks, but it is still a percentage of what they used to earn. The amount that an employee would receive differs from each state. Certain states also provide additional benefit amounts to employees with dependents.

You should know that unemployment benefits are taxable. NOTE: This example code above fails to properly account for international characters in the filename. See RFC for the relevant standardization. I believe recent versions of ASP. So I'm posting what worked for me as an alternative in case anybody else is having trouble.

Darin Dimitrov's answer is correct. Just an addition:. AppendHeader "Content-Disposition", cd. ToString ; may cause the browser to fail rendering the file if your response already contains a "Content-Disposition" header. In that case, you may want to use:. Below code worked for me for getting a pdf file from an API service and response it out to the browser - hope it helps;. Action method needs to return FileResult with either a stream, byte[], or virtual path of the file.

You will also need to know the content-type of the file being downloaded. Sample video link How to download files using asp. If, like me, you've come to this topic via Razor components as you're learning Blazor, then you'll find you need to think a little more outside of the box to solve this problem. It's a bit of a minefield if also like me Blazor is your first forray into the MVC-type world, as the documentation isn't as helpful for such 'menial' tasks.

Next, make sure your application startup Startup. Hopefully this helps anyone who struggled like me! Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 10 years, 7 months ago. Active 1 year, 7 months ago.

Viewed k times. These are the examples of what I've tried so far. Data, document. ContentType, document. Data , document. Add HeaderNames. ContentDisposition, cd. ToString ; return File document. Nick Albrecht. Nick Albrecht Nick Albrecht 16k 9 9 gold badges 67 67 silver badges 97 97 bronze badges.

Add a comment. Active Oldest Votes. Oskar Berggren 5, 1 1 gold badge 15 15 silver badges 35 35 bronze badges. Darin Dimitrov Darin Dimitrov k gold badges silver badges bronze badges. If I recall correctly, it can be un-quoted so long as the filename has no spaces I ran mine through HttpUtility.