Headers Operation
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Headers为Istio提供了操作HTTP Header的途径,用于操作HTTP 请求报文中Request或者Response标头
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headers字段支持request和response两个内嵌字段
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request:操纵发送给Destination的请求报文中的标头
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response:操纵发送给客户端的响应报文中的标头
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以上两个对应的类型都是 HeaderOperations 类型,都支持使用set、add、remove字段操纵指定的标头
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set:使用map上的Key和Value覆盖Request或者Response中对应的Header
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add:追加map上的Key和Value到原有 Header
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remove:删除在列表中指定的Header
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virtualservice-demoapp.yaml
apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
name: demoapp
spec:
hosts:
- demoapp
http:
- name: canary
match:
- headers:
x-canary:
exact: "true"
route:
- destination:
host: demoapp
subset: v11
headers:
request:
set:
User-Agent: Chrome
response:
add:
x-canary: "true"
- name: default
headers:
response:
add:
X-Envoy: test
route:
- destination:
host: demoapp
subset: v10
更新demoapp vs
# kubectl apply -f virtualservice-demoapp.yaml virtualservice.networking.istio.io/demoapp configured
访问demoapp
访问v10子集
root@client # curl demoapp:8080
iKubernetes demoapp v1.0 !! ClientIP: 127.0.0.6, ServerName: demoappv10-78b6586d58-kdv4m, ServerIP: 172.20.154.195!
root@client # curl demoapp:8080/user-agent
User-Agent: curl/7.67.0
root@client # curl -I demoapp:8080
HTTP/1.1 200 OK
content-type: text/html; charset=utf-8
content-length: 116
server: envoy
date: Wed, 26 Oct 2022 08:51:25 GMT
x-envoy-upstream-service-time: 2
x-envoy: test
访问v11子集
root@client # curl -H "x-canary: true" demoapp:8080
iKubernetes demoapp v1.1 !! ClientIP: 127.0.0.6, ServerName: demoappv11-78bf898c74-hckjf, ServerIP: 172.20.89.189!
root@client # curl -H "x-canary: true" demoapp:8080/user-agent
User-Agent: Chrome
root@client # curl -I -H "x-canary: true" demoapp:8080
HTTP/1.1 200 OK
content-type: text/html; charset=utf-8
content-length: 116
server: envoy
date: Wed, 26 Oct 2022 08:52:32 GMT
x-envoy-upstream-service-time: 114
x-canary: true
参考文档
Headers:https://istio.io/latest/zh/docs/reference/config/networking/virtual-service/#Headers
Headers.HeaderOperations:https://istio.io/latest/zh/docs/reference/config/networking/virtual-service/#Headers-HeaderOperations
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