Rest asynchronous file download

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RequestAsync 1. Example 1. Show file. File: UpdateService. DownloadData request. Example 2. How to use restsharp to download file Ask Question. Asked 6 years, 8 months ago. Active 4 months ago. Viewed 44k times.

Learner Learner 1, 3 3 gold badges 13 13 silver badges 31 31 bronze badges. Add a comment. Active Oldest Votes. DownloadData request. SaveAs path ; With HttpClient , it's a bit more involved. DownloadFileAsync folderPath, "foo. JMK Todd Menier Todd Menier The method SaveAs was removed? I can't use it.

Probably I have to use File. JCarlos : The SaveAs method is still there. It's in the RestSharp. Extensions namespace, MiscExtensions class. In this article we'll see how to download files off the web. This is accomplished without too much effort using the WebRequest and the WebResponse classes. These classes offer methods that allow us to access the data from the web as a stream. There are two mechanisms that we can use for downloading files.

For small files we can use synchronous mechanism and for large files or files that are downloaded from servers whose response times cannot be predicted we can use asynchronous mechanism. I'll demonstrate both methods in this article.

I've used five classes there in quick succession. I guess that's just what the BCL is all about, a lavish abundance of classes. Copy Code WebRequest is an abstract class that allows an user to request internet data in a protocol independent manner. We use the Copy Code static method Create to request our file. One big advantage of using these classes is that they all allow us stream access.

The rest of it is simple if you have used streams before. If not, you can read my article on files and streams here on CP. We simply read from the stream returned by the HttpWebResponse object and write the data to a file. This is a little bit more complicated than synchronous downloads. But then, as you might expect when you are downloading several large files, then this is the more efficient method.

We create our WebRequest object just as we did above, but instead of calling GetResponse , we call BeginGetResponse which begins an asynchronous request for an Internet resource. We specify a response callback function as one of the arguments. We then wait on a Copy Code ManualResetEvent object which is set by the callback, so that our function will be able to block using a wait call till the entire response is read and stored.

We also pass our WebRequest object as the state object for the callback function. The EndGetResponse method concludes the asynchronous request that was initiated using the BeginGetResponse method and returns a WebResponse object from which we can use GetResponseStream to get the underlying stream object. Now we begin our next asynchronous operation on the stream. We start an asynchronous read operation using Copy Code BeginRead.

If you are wondering why we do this, here is a snip from MSDN. Internet requests made with WebRequest and its descendents must use Stream. BeginRead to read the stream returned by the WebResponse. GetResponseStream method". We call EndRead on the stream and get back the count of bytes that were read from the stream. EndRead is a blocking call and is to be called once per BeginRead call we have initiated already. If the count of bytes read is greater than zero, then there is more data left.

Otherwise we know that all the data has arrived and we close the stream and also set the event on which our main function is waiting. It works! And all that in less than a hundred lines of Rust code with some very basic error handling and input validation using just a couple of crates.

You can find the full example code at GitHub. Efficiently and robustly handling file uploads in a web service is not an easy task, but the Rust ecosystem provides all the tools to do so, even with options to asynchronously stream files for additional speed and flexibility.

The above example is a starting point for a real-world implementation. That said, the fundamentals are already there in the Rust web ecosystem to create great upload and download experiences for your users. Instead of guessing why problems happen, you can aggregate and report on what state your application was in when an issue occurred. Modernize how you debug your Rust apps — start monitoring for free. Thanks for the interesting tutorial.

I expanded it slightly by adding cors. This works fine for the download path, but it seems that its not working even though compiling for the upload part. Any idea why this could be? I added your CORS config and for me it works. How are you calling it? I tested it with cURL and Postman and in both cases it worked just fine. One thing I sometimes do to debug the errors, is add log statements printlns for example on top of the.