diff --git a/.changelog/10958.txt b/.changelog/10958.txt
new file mode 100644
index 000000000..2f85b2a6d
--- /dev/null
+++ b/.changelog/10958.txt
@@ -0,0 +1,4 @@
+
+```release-note:bug
+api: Reverted to using http/1 to fix a 1.1.2 regression in `alloc exec` sessions
+```
diff --git a/api/api.go b/api/api.go
index d1f985dbe..140089e4c 100644
--- a/api/api.go
+++ b/api/api.go
@@ -249,6 +249,10 @@ func defaultHttpClient() *http.Client {
 		MinVersion: tls.VersionTLS12,
 	}
 
+	// Default to http/1: alloc exec/websocket aren't supported in http/2
+	// well yet: https://github.com/gorilla/websocket/issues/417
+	transport.ForceAttemptHTTP2 = false
+
 	return httpClient
 }