From 0c3c559cc5f679b0ae381d830e02b05282c041c1 Mon Sep 17 00:00:00 2001
From: Mahmood Ali <mahmood@hashicorp.com>
Date: Tue, 27 Jul 2021 16:45:23 -0400
Subject: [PATCH 1/2] api: revert to defaulting to http/1

PR #10778 incidentally changed the api http client to connect with
HTTP/2 first. However, the websocket libraries used in `alloc exec`
features don't handle http/2 well, and don't downgrade to http/1
gracefully.

Given that the switch is incidental, and not requested by users.
Furthermore, api consumers can opt-in to forcing http/2 by setting
custom http clients.
---
 api/api.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/api/api.go b/api/api.go
index d1f985dbefe..140089e4c79 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
 }
 

From 00a1413fc49ffd12b91695eee2a1c828c9ab6c63 Mon Sep 17 00:00:00 2001
From: Mahmood Ali <mahmood@hashicorp.com>
Date: Wed, 28 Jul 2021 10:15:34 -0400
Subject: [PATCH 2/2] changelog

---
 .changelog/10958.txt | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 .changelog/10958.txt

diff --git a/.changelog/10958.txt b/.changelog/10958.txt
new file mode 100644
index 00000000000..2f85b2a6d58
--- /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
+```