Trying to get the proper content disposition

Author: alexeyzimarev

src/RestSharp/Request/RequestContent.cs

@@ -66,6 +66,11 @@ void AddFiles() {
 
             if (file.ContentType != null)
                 fileContent.Headers.ContentType = MediaTypeHeaderValue.Parse(file.ContentType);
+
+            fileContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("form-data") {
+                Name     = file.Name,
+                FileName = file.FileName
+            };
             mpContent.Add(fileContent, file.Name, file.FileName);
         }
 

test/RestSharp.Tests.Integrated/MultipartFormDataTests.cs

@@ -34,7 +34,7 @@ public MultipartFormDataTests(ITestOutputHelper output) {
     const string ExpectedFileAndBodyRequestContent =
         "--{0}" +
         $"{LineBreak}{KnownHeaders.ContentType}: application/octet-stream" +
-        $"{LineBreak}{KnownHeaders.ContentDisposition}: form-data; name=fileName; filename=TestFile.txt; filename*=utf-8''TestFile.txt" +
+        $"{LineBreak}{KnownHeaders.ContentDisposition}: form-data; name=fileName; filename=TestFile.txt" +
         $"{LineBreak}{LineBreak}This is a test file for RestSharp.{LineBreak}" +
         $"--{{0}}{LineBreak}{KnownHeaders.ContentType}: application/json; {CharsetString}" +
         $"{LineBreak}{KnownHeaders.ContentDisposition}: form-data; name=controlName" +
@@ -123,8 +123,8 @@ public async Task MultipartFormData_HasDefaultContentType() {
         _output.WriteLine($"Expected: {expectedFileAndBodyRequestContent}");
         _output.WriteLine($"Actual: {response.Content}");
 
-        Assert.Equal(expectedFileAndBodyRequestContent, response.Content);
-        Assert.Equal(expectedDefaultMultipartContentType, RequestHandler.CapturedContentType);
+        response.Content.Should().Be(expectedFileAndBodyRequestContent);
+        expectedDefaultMultipartContentType.Should().Be(RequestHandler.CapturedContentType);
     }
 
     [Fact]