[I] help request: How to create a custom-404-redirect plugin? [apisix]

[via GitHub]

rohitkrishna-marneni opened a new issue, #12023:
URL: https://github.com/apache/apisix/issues/12023

   ### Description
   
   I want to create a plugin where if upstream status is 404, I will be able to 
specify a custom 404 page and it should go there.
   
   So this is what I have so far.
   
   My apisix configuration for route
   ```yml
   services:
     - name: my-service
       upstream:
         pass_host: pass
         nodes:
           - host: my-api.com
             port: 80
             weight: 1
             priority: 0
         type: roundrobin
         scheme: http
         name: my-api
         hash_on: vars
         timeout:
           send: 10
           read: 60
           connect: 2
       routes:
         - name: my product page route
           hosts:
             - "mysite.com"
           uris:
             - /shop/products/*
           priority: 0
           plugins:
             custom-404-redirect:
               redirect_url: /us/en/footer/terms-conditions.html
   ```
   
   And my plugin code is as shown below
   
   ```lua
   local core = require("apisix.core")
   local ngx = ngx
   
   local plugin_name = "custom-404-redirect"
   
   local schema = {
       type = "object",
       properties = {
           redirect_url = {type = "string", minLength = 1}
       },
       required = {"redirect_url"}
   }
   
   local _M = {
       version = 0.1,
       priority = 1010,  -- set the plugin priority, higher means earlier 
execution
       name = plugin_name,
       schema = schema
   }
   
   function _M.check_schema(conf)
       return core.schema.check(schema, conf)
   end
   
   function _M.header_filter(conf, ctx)
       if ngx.status == 404 then
           ngx.status = 302
           ngx.header["Location"] = conf.redirect_url
           ngx.log(ngx.ERR, "Redirecting to custom 404 page: ", 
conf.redirect_url)
           ngx.exit(ngx.HTTP_MOVED_TEMPORARILY)
           end
   end
   
   return _M
   ```
   
   But this is not working and simply throwing a 500 status code instead of 
going to a 404 as expected. Is it not possible to do it via plugin?
   
   ### Environment
   
   - APISIX version (run `apisix version`):
   - Operating system (run `uname -a`): Ubuntu
   - OpenResty / Nginx version (run `openresty -V` or `nginx -V`):
   - etcd version, if relevant (run `curl 
http://127.0.0.1:9090/v1/server_info`):
   - APISIX Dashboard version, if relevant:
   - Plugin runner version, for issues related to plugin runners:
   - LuaRocks version, for installation issues (run `luarocks --version`):
   


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