RequestHandler: fix cancellation

Author: hyperblast

src/Client/Infrastructure/RequestHandler.cs

@@ -1,5 +1,4 @@
 using System;
-using System.Buffers.Text;
 using System.Collections.Generic;
 using System.Net;
 using System.Net.Http;
@@ -127,7 +126,9 @@ public async IAsyncEnumerable<object> GetEvents(
         var responseStream = await response.Content.ReadAsStreamAsync(cancellationToken).ConfigureAwait(false);
         await using var responseStreamScope = responseStream.ConfigureAwait(false);
 
-        await foreach (var lineData in _readerFactory.CreateReader(responseStream).ConfigureAwait(false))
+        await foreach (var lineData in _readerFactory.CreateReader(responseStream)
+                           .WithCancellation(cancellationToken)
+                           .ConfigureAwait(false))
         {
             // Note: this does not support multi-line events, see spec:
             // https://html.spec.whatwg.org/multipage/server-sent-events.html#event-stream-interpretation