githubcdr opened a new issue, #12195:
URL: https://github.com/apache/apisix/issues/12195

   ### Current Behavior
   
   Hi,
   
   
   I find it extremely frustrating to add a Alt-Svc header for http3, the colon 
seems to be the issue.
   
   I can not add a simple header containing
   
   "Alt-Svc: h3=":443";ma=400"
   
   Via ingress controller this does not work as expected, the dashboard 
complains about a string (even exscaped)
   
   ```
   k8s.apisix.apache.org/enable-response-rewrite: "true"
   k8s.apisix.apache.org/response-rewrite-add-header: "Alt-Svc: 
h3=\\\":443\\\";ma=400"
   
   NOR does
   
   k8s.apisix.apache.org/response-rewrite-add-header: |
         Alt-Svc: h3=":443";ma=400
   ```
   
   As a normal user that does not want to devote a life to yaml, how do I get 
this working?
   
   Thanks
   
   ps
   http3 is working via curl tests
   
   ### Expected Behavior
   
   Make it human friendly to enable http3
   
   ### Error Logs
   
   NA
   
   ### Steps to Reproduce
   
   1. enable http3 in helm values and enable UDP port
   2. Sacrifice too many hours getting a header in the response to promote http3
   
   ### Environment
   
   - APISIX version 3.12
   - Operating system Kubernetes 1.33
   - default install


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