HTTP header key formatted problem

[66li]

Expecting to convert all HTTP keys to lowercase, but in reality, this does not work,
Is there an existing solution for reference

[k8s-ci-robot]

This issue is currently awaiting triage.

If Ingress contributors determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[66li]

i need help

[longwuyuan]

• Look at the template of a new bug report
• Edit this issue description and answer those questions here in this issue description
• Ensure to use markdown format
• Give some examples
• Search github for other users having attempted it
• One good example is geop2 related configs injected into the nginx.conf for variables

This having data, context, links and elaborate descriptions can help draw attention as there are hardly any resources here.

You can even get more people to look at your messages on kubernetes.slack.com in the ingress-nginx-users channel (register at slack.k8s.io if needed)

/remove-kind bug
/kind support

[66li]

When I use curl https://example.com -H "CC: bb"
I hope that the request header received by the backend service after forwarding through nginx ingress is
cc: bb
In fact, nginx did not do any processing, and the HTTP header received by the backend service is CC: bb

[longwuyuan]

That is expected behaviour. What is your expectation.

…

On Sun, 24 Nov, 2024, 15:44 66li, ***@***.***> wrote: When I use curl https://example.com -H "CC: bb" I hope that the request header received by the backend service after forwarding through nginx ingress is cc: bb In fact, nginx did not do any processing, and the HTTP header received by the backend service is CC: bb — Reply to this email directly, view it on GitHub <#12395 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABGZVWXQ7H36LKEYYTJ4JRL2CGRJLAVCNFSM6AAAAABSF3YQ5KVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDIOJVHEYTSOJRHA> . You are receiving this because you commented.Message ID: ***@***.***>

[66li]

I want to format the key in nginx ingress
curl https://example.com -H "CC: bb"
Backend service received
cc: bb

[66li]

This background is my team's migration from Istio provided by cloud service providers to nginx
The default configuration of Istio is to lowercase all http header key

[longwuyuan]

Can nginx without Kubernetes do that ?

…

On Sun, 24 Nov, 2024, 16:48 66li, ***@***.***> wrote: I want to format the key in nginx ingress curl https://example.com -H "CC: bb" Backend service received cc: bb — Reply to this email directly, view it on GitHub <#12395 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABGZVWSWW5KEVEGKBURKART2CGYZDAVCNFSM6AAAAABSF3YQ5KVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDIOJVHE2DOMRRHE> . You are receiving this because you commented.Message ID: ***@***.***>

[66li]

It seems that,
I tried using Lua script but it didn't work

[66li]

 k get cm headers-lower -o yaml
apiVersion: v1
data:
  headers_lower.lua: |
    local headers = ngx.req.get_headers()
    local lower_headers = {}

    for key, value in pairs(headers) do
        local lower_key = string.lower(key)
        lower_headers[lower_key] = value
    end

    ngx.req.clear_header()
    for key, value in pairs(lower_headers) do
        ngx.req.set_header(key, value)
    end
    ngx.req.set_header("X-Custom-Header", "Hello, Lua Plugin!")
    ngx.req.set_header("AAX-Custom-Header", headers)
    ngx.log(ngx.DEBUG, headers)
kind: ConfigMap


k get cm nonprod-1-11-2-ingress-nginx-controller -o yaml
apiVersion: v1
data:
  allow-snippet-annotations: "true"
  server-snippet: |
    access_by_lua_file /etc/nginx/lua/headers_lower.lua;
kind: ConfigMap

[66li]

 k get deploy  nonprod-1-11-2-ingress-nginx-controller -o yaml
         volumeMounts:
        - mountPath: /etc/nginx/lua/headers_lower.lua
          name: lua-scripts
          readOnly: true
          subPath: headers_lower.lua
       volumes:
      - configMap:
          defaultMode: 420
          items:
          - key: headers_lower.lua
            path: headers_lower.lua
          name: headers-lower
        name: lua-scripts

[66li]

I think I'm not the only one who has encountered similar problems,
The default configuration of Istio is to format all HTTP header keys
I don't know if there is an elegant solution on nginx ingress

[longwuyuan]

Nginx does not have this feature as far as I know, unfortunately.

…

On Sun, 24 Nov, 2024, 17:02 66li, ***@***.***> wrote: I think I'm not the only one who has encountered similar problems, The default configuration of Istio is to format all HTTP header keys I don't know if there is an elegant solution on nginx ingress — Reply to this email directly, view it on GitHub <#12395 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABGZVWUIYZEDXOY6WNBZW332CG2LTAVCNFSM6AAAAABSF3YQ5KVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDIOJVHE2TENBVGE> . You are receiving this because you commented.Message ID: ***@***.***>

[66li]

ok
Can I use Lua script to implement this feature? I am a newcomer to Lua, so I need help

[longwuyuan]

We are not supporting custom scripts or server snippets etc in future versions. So sorry for that. It's a good use in your case but it means someone else make bad use of it.

…

On Sun, 24 Nov, 2024, 17:13 66li, ***@***.***> wrote: ok Can I use Lua script to implement this feature? I am a newcomer to Lua, so I need help — Reply to this email directly, view it on GitHub <#12395 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABGZVWWGA3Q45JRKZEJCSCD2CG3XXAVCNFSM6AAAAABSF3YQ5KVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDIOJVHE2TONBVGU> . You are receiving this because you commented.Message ID: ***@***.***>

[66li]

ok
Is there any other way to achieve similar functionality,
Lowercase all the keys in the HTTP header

[longwuyuan]

This is the first time I have seen this requirement. Why don't you join slack at kubernetes.slack.com and ask. Register at slack.k8s.io .

…

On Sun, 24 Nov, 2024, 17:18 66li, ***@***.***> wrote: ok Is there any other way to achieve similar functionality, Lowercase all the keys in the HTTP header — Reply to this email directly, view it on GitHub <#12395 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABGZVWUIL3GRFVOLRT2IJLD2CG4IDAVCNFSM6AAAAABSF3YQ5KVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDIOJVHE2TSNRRGI> . You are receiving this because you commented.Message ID: ***@***.***>