14 vs HTTP Header Operation
当 Envoy 在进行请求流量转发的时候, 还可以对消息 (request/response)
的 Header 进行操作。
set
: 如果不存在, 则 创建 header, 如果存在, 则 覆盖 header
spec:
http:
- headers:
request:
set:
key1: value1
key2: value2
add
: 如果不存在, 则 新增; 如果村子啊, 则 追加
spec:
http:
- headers:
request:
add:
key1: value1
key2: value2
remove
: 如果存在, 则 删除 header; 不存在, 则 忽略
spec:
http:
- headers:
request:
remove:
- key1
- key2
创建 vs-review 配置如下, 对 header reqeust 更新/追加/删除 进行操作。
---
# vs review
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: vs-review
namespace: myistio # 注意 namespace
spec:
gateways:
- istio-tangx-in
hosts:
- istio.tangx.in
- svc-review
http:
# header 操作
- name: "header-operation"
headers: # request header 操作与 route 在一层
request:
set: # 更新
header-injection: "anything"
add: # 追加
header-add-not-exist: "not-exist"
header-add-exist: "if-overwrite"
remove: # 删除
- header-should-remove
- "header-should-remove2"
更新 review, 向 response 中添加所有 request 的 header
// 展示 header
func headerHanlder(c *gin.Context) {
// response 中写入 request header
for key, value := range c.Request.Header {
c.Header(key, fmt.Sprintf("%s", value))
}
// 判断 header 是否注入成功
headerInjection := c.GetHeader("header-injection")
if headerInjection != "" {
c.Header("remove-header", "this remove-header is invisible")
c.JSON(http.StatusOK, gin.H{
"code": "success",
"message": "header 注入成功",
"header": fmt.Sprintf("header-injection value is = %s", headerInjection),
})
return
}
// 默认注入失败
c.JSON(http.StatusBadRequest, gin.H{
"code": "failed",
"message": "header 注入失败",
})s
}
向 review 发送请求, 可以看到所有 header
### header operation
GET http://istio.tangx.in/header/review/header
# anything, 被 envoy 覆盖
header-injection: user-request
# header-exist if-overwrite, 被 envoy 追加
header-add-exist: header-exist
# 不存在, 被 envoy 删除
header-should-remove: anything