C# Get Byte Array from HttpResposeMessage

Question

I have an API that returns a PDF file as a byte array:

HttpResponseMessage fileResponse = new HttpResponseMessage
{
    Content = new ByteArrayContent(report) //here the byte array is >80000 in length
};
fileResponse.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/pdf");
return fileResponse;

On the client, I have:

HttpResponseMessage result = null;
using (HttpClient client = new HttpClient(new HttpClientHandler() { UseDefaultCredentials = true }))
{
    result = await client.GetAsync(getFileURL);
}
Byte[] bytes = response.Content.ReadAsByteArrayAsync().Result;

This code worked until an upgrade to .Net 5.

Now bytes is only <350 in length. I have tried converting it from a base64 string as I have read in other solutions, but that throws an error saying it is not a valid base64 string:

string base = response.Content.ReadAsStringAsync().Result.Replace("\"", string.Empty);
byte[] byte = Convert.FromBase64String(base);

Here's what base looks like after the replace, which the next line says is not a valid base64 string. Looks like json but no byte array:

{version:{major:1,minor:1,build:-1,revision:-1,majorRevision:-1,minorRevision:-1},content:{headers:[{key:Content-Type,value:[application/pdf]}]},statusCode:200,reasonPhrase:OK,headers:[],trailingHeaders:[],requestMessage:null,isSuccessStatusCode:true}

So any ideas on how to get the byte array out the response?

Looks like the default now is HTTP/2. Not sure what is broken. Need to do more research. See : learn.microsoft.com/en-us/aspnet/core/release-notes/… — jdweng
– jdweng, Commented Mar 11, 2021 at 17:05
response.Content.ReadAsByteArrayAsync().Result should be result? Does fileResponse contain all the bytes in your API? Where/how are you determining you have <350? — mxmissile
– mxmissile, Commented Mar 11, 2021 at 17:06
See following : devblogs.microsoft.com/dotnet/net-5-new-networking-improvements/… — jdweng
– jdweng, Commented Mar 11, 2021 at 17:13

J.Cart · Accepted Answer · 2021-03-11 17:13:21Z

1

The solution I got to work was instead of having the API return an HttpResponseMessage, have it return the byte array directly.

Then in the client converting it from a base64 string gave me the correct byte array that I was able to write as the PDF.

answered Mar 11, 2021 at 17:13

J.Cart

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