How to configure request and response header manipulation-Alibaba Cloud Service Mesh-阿里云帮助中心

You can add or remove request and response headers before requests are forwarded. A virtual service lets you modify headers without changing your application code. This topic describes how to configure request and response header manipulation.

Prerequisites

Make sure that you have completed the preparations and deployed the httpbin and sleep services. For more information, see Preparations.

Procedure

Verify the service configuration.

In the KubeConfig environment for your ACK cluster, run the following command to enter the sleep environment and start a bash session.
```
kubectl exec -it deploy/sleep -- sh
```

Run the following command to send a request to the httpbin service.

curl -I httpbin:8000

Expected output:

HTTP/1.1 200 OK
server: envoy
date: Fri, 11 Aug 2023 09:50:24 GMT
content-type: text/html; charset=utf-8
content-length: 9593
access-control-allow-origin: *
access-control-allow-credentials: true
x-envoy-upstream-service-time: 3

Use the following content to configure traffic rules for the httpbin application and add a header modification configuration. For more information, see Manage virtual services.

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: httpbin-vs
  namespace: default
spec:
  hosts:
    - httpbin
  http:
    - route:
        - destination:
            host: httpbin
          headers:
            response:
              add:
                httpbin: hello
              remove:
                - x-envoy-upstream-service-time

Verify the configuration.
1. In the KubeConfig environment for your ACK cluster, run the following command to enter the sleep environment and start a bash session.
```
kubectl exec -it deploy/sleep -- sh
```
2. Run the following command to send a request to the httpbin service.
```
curl -I httpbin:8000
```
  Expected output:
```
HTTP/1.1 200 OK
server: envoy
date: Fri, 11 Aug 2023 09:49:37 GMT
content-type: text/html; charset=utf-8
content-length: 9593
access-control-allow-origin: *
access-control-allow-credentials: true
httpbin: hello
```
  The output shows that the header configuration in the virtual service has taken effect. The x-envoy-upstream-service-time header is removed, and the httpbin: hello header is added.