Merge pull request #67578 from chanjarster/issue-67561

Automatic merge from submit-queue (batch tested with PRs 67578, 68154, 68162, 65545). If you want to cherry-pick this change to another branch, please follow the instructions here: https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md.

Fixes #67561 Multiple same headers got wrong result on gcr.io/google-containers/echoserver:1.10

**What this PR does / why we need it**:
Fix a bug of echoserver

**Which issue(s) this PR fixes**:
Fixes #67561

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

test/images/echoserver/VERSION

@@ -1 +1 @@
-2.1
+2.2

test/images/echoserver/nginx.conf

@@ -52,7 +52,14 @@ Request Information:
 
 Request Headers:
 {% for i, key in ipairs(keys) do %}
-	{{key}}={{headers[key]}}
+	{% local val = headers[key] %}
+	{% if type(val) == "table" then %}
+		{% for i = 1,#val do %}
+	{{key}}={{val[i]}}
+		{% end %}
+	{% else %}
+	{{key}}={{val}}  
+	{% end %}
 {% end %}
 
 Request Body: