Web API to receive byte array

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I get a HTTP error 415 Unsupported Media Type in the HttpResponseMessage.
How do I get the server side codes to work?

HTTPClient is used to post byte array data as follow...

using(HttpClient c=new HttpClient()
{
c.DefaultRequestHeader.Accept.Add(new MediaTypeWithQualityHeaderValue("application/octet-stream)

byte[] Data=new byte { 0x00, 0x01, 0x02... };

HttpResponseMessage r=await c.PostAsync("http://abc.com/api/File/Filename", new ByteArrayContent(Data);

if(r.IssuccessStatusCode) return true;
return false;
}

Server Side(MVC/Razor) receive byte array as follow

[HttpPost("{Filename}")]
public async Task<int> Post([FromBody] string Filename)
{
MemoryStream ms=new MemoryStream((int)Request.Body.Length);
await Request.Body.CopyToAsync(ms);

byte[] b=ms.ToArray(); ms.close();
File.WriteAllBytesAsync("Data.bin", b);
return b.Length;
}

What I have tried:

Compiled under Visual Studio 2017 running on Windows 10 Pro workstation

Posted 22-Jan-19 12:01pm

Member 8921416

Updated 23-Jan-19 5:53am

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Bryian Tan 22-Jan-19 23:47pm

This might help c# - Post byte array to Web API server using HttpClient - Stack Overflow[^]

Member 8921416 23-Jan-19 3:20am

I've seen that example and didn't see useful code snippets on server side.
The client side is straight forward using HttpClient. Server side seems to even crash at Request.Body.Length accessor

Richard Deeming 24-Jan-19 8:05am

Why are you binding the Filename parameter to both the route and the request body, whilst also trying to read the request body manually?

Also, setting the "accept" header on the request tells the server which response formats it can send. It doesn't change which request formats the server will accept.

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Bohdan Stupak · Answer 1 · 2019-01-23T05:54:00

Solution 1

You can do it as simply as this

C#

[HttpPost]
public void Post(byte[] bytes)
{
   //your code
}

Web API handles byte array as input parameters quite well

Posted 23-Jan-19 5:54am

Bohdan Stupak

Comments

Member 8921416 23-Jan-19 19:49pm

HttpClient.PostAsyn(string URL, HttpContent c) doesn't allow the byte array to be pass via URL. How HttpClient is going to call this API at server side?

Bohdan Stupak 26-Jan-19 11:14am

Unlike GET request you don't pass POST request parameters via URL. You pass them via body. Have a look at the example https://stackoverflow.com/questions/16416601/c-sharp-httpclient-4-5-multipart-form-data-upload

Member 8921416 28-Jan-19 4:06am

if HttpClient is used to simply post a ByteArrayContent, the server side should be able to pickup the ByteArrayContent from the HttpRequest body. I'm looking for sample code that allow server side to collect the ByteArrayContent posted by client.

Bohdan Stupak 31-Jan-19 5:50am

try this one https://stackoverflow.com/a/23884972