Classic to async facade to propagate ConnectionClosedException to the caller

Author: ok2c

httpcore5/src/main/java/org/apache/hc/core5/http/nio/support/classic/ClassicToAsyncSupport.java

@@ -29,6 +29,7 @@
 
 import java.io.IOException;
 
+import org.apache.hc.core5.http.ConnectionClosedException;
 import org.apache.hc.core5.http.HttpException;
 
 final class ClassicToAsyncSupport {
@@ -40,6 +41,8 @@ static void rethrow(final Throwable ex) throws IOException {
             throw (Error) ex;
         } else if (ex instanceof RuntimeException) {
             throw (RuntimeException) ex;
+        } else if (ex instanceof ConnectionClosedException) {
+            throw (ConnectionClosedException) ex;
         } else if (ex instanceof IOException) {
             throw new TransportException((IOException) ex);
         } else if (ex instanceof HttpException) {