diff --git a/DevProxy.Proxy.Kestrel/Internal/ProxyConnectionHandler.cs b/DevProxy.Proxy.Kestrel/Internal/ProxyConnectionHandler.cs
index a685cbb1..8d58538e 100644
--- a/DevProxy.Proxy.Kestrel/Internal/ProxyConnectionHandler.cs
+++ b/DevProxy.Proxy.Kestrel/Internal/ProxyConnectionHandler.cs
@@ -278,7 +278,8 @@ private async Task BlindTunnelAsync(Stream clientStream, string host, int port,
     private async Task<bool> ExchangeAsync(
         Http1ConnectionReader reader, Stream clientStream, ParsedRequestHead head, string absoluteUrl, CancellationToken ct)
     {
-        if (!Uri.TryCreate(absoluteUrl, UriKind.Absolute, out var requestUri))
+        if (!Uri.TryCreate(absoluteUrl, UriKind.Absolute, out var requestUri)
+            || (requestUri.Scheme != "http" && requestUri.Scheme != "https"))
         {
             await WriteErrorAsync(clientStream, HttpStatusCode.BadRequest, "Malformed request target", ct).ConfigureAwait(false);
             return false;