Issue
I have a requirement to rewrite all URLs to lowercase.
E.g. test.com/CHILD to test.com/child
Frontend application is developed on docker on azure kubernetes services. Ingress is controlled on nginx ingress controller.
Solution
You can rewrite URLs using Lua as described in the Enforce Lower Case URLs (NGINX) article.
All we need to do is add the following configuration block to nginx:
location ~ [A-Z] {
rewrite_by_lua_block {
ngx.redirect(string.lower(ngx.var.uri), 301);
}
}
I will show you how it works.
First, I created an Ingress resource with the previously mentioned configuration:
$ cat test-ingress.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: test-ingress
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/rewrite-target: /
nginx.ingress.kubernetes.io/server-snippet: |
location ~ [A-Z] {
rewrite_by_lua_block {
ngx.redirect(string.lower(ngx.var.uri), 301);
}
}
spec:
rules:
- http:
paths:
- path: /app-1
pathType: Prefix
backend:
service:
name: app-1
port:
number: 80
$ kubectl apply -f test-ingress.yaml
ingress.networking.k8s.io/test-ingress created
$ kubectl get ing
NAME CLASS HOSTS ADDRESS PORTS AGE
test-ingress <none> * <PUBLIC_IP> 80 58s
Then I created a sample app-1 Pod and exposed it on port 80:
$ kubectl run app-1 --image=nginx
pod/app-1 created
$ kubectl expose pod app-1 --port=80
service/app-1 exposed
Finally, we can test if rewrite works as expected:
$ curl -I <PUBLIC_IP>/APP-1
HTTP/1.1 301 Moved Permanently
Date: Wed, 06 Oct 2021 13:53:56 GMT
Content-Type: text/html
Content-Length: 162
Connection: keep-alive
Location: /app-1
$ curl -L <PUBLIC_IP>/APP-1
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
...
Additionally, in the ingress-nginx-controller logs, we can see the following log entries:
10.128.15.213 - - [06/Oct/2021:13:54:34 +0000] "GET /APP-1 HTTP/1.1" 301 162 "-" "curl/7.64.0" 83 0.000 [-] [] - - - - c4720e38c06137424f7b951e06c3762b
10.128.15.213 - - [06/Oct/2021:13:54:34 +0000] "GET /app-1 HTTP/1.1" 200 615 "-" "curl/7.64.0" 83 0.001 [default-app-1-80] [] 10.4.1.13:80 615 0.001 200 f96b5664765035de8832abebefcabccf
Answered By - matt_j Answer Checked By - David Marino (PHPFixing Volunteer)
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