![]() ![]() HttpClient is the newest version, while WebRequest is obsolete.WebRequest does all HttpClient does, but more complex, especially for Async calling.Comparison between HttpWebRequest (HtppWebClient) and HttpClient.This article will discuss the three ways of consuming REST Web API provided by Microsoft. Async reading chunked content with HttpClient from ASP.This series of articles will give you ways to consume Web API by a ASP.NET MVC Client in.NET HttpClient and HttpCompletionOption.ResponseHeadersRead Afterwards, we are getting the stream and calling the CopyToAsync method on it by passing our FileStream. This means that the HttpContent is not ready at the time when you get the control back. In other words, it will just read the headers and return the control back. This switch tells the HttpClient not to buffer the response. Notice that we are calling another overload of the GetAsync method by passing the HttpCompletionOption enumeration value as ResponseHeadersRead. Using (HttpResponseMessage response = await client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead)) Static async Task HttpGetForLargeFileInRightWay() We can do it by just reading the headers of the response and then getting a handle for the network stream as below: We need a way not to load the response body into memory and have the raw network stream so that we can pass the bytes into another stream without hitting the memory too hard. ![]() This will just get us the MemoryStream, so there is no point there: We are calling ReadAsStreamAsync on HttpContent after the GetAsync method is completed. You can see this happening in a simple way by opening the Task Manager and observing the memory of the process. Using (Stream streamToWriteTo = File.Open(fileToWriteTo, FileMode.Create))Īwait streamToReadFrom.CopyToAsync(streamToWriteTo) īy calling GetAsync method directly there, we are loading every single byte into memory. String fileToWriteTo = Path.GetTempFileName() ![]() Using (Stream streamToReadFrom = await ()) Using (HttpResponseMessage response = await client.GetAsync(url)) Using (HttpClient client = new HttpClient()) Static async Task HttpGetForLargeFileInWrongWay() ![]()
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