Re: [I] help request: how to add field of $request_body to new header using proxy-rewrite [apisix]

["shreemaan-abhishek (via GitHub)" <gi...@apache.org>]

shreemaan-abhishek commented on issue #10548:
URL: https://github.com/apache/apisix/issues/10548#issuecomment-1827030374

   you need to use the serverless plugin first to register the request body to a variable using `core.request.get_body()` and then use it to set a header in `proxy-rewrite` plugin. I am sharing the following examples for you to get started:
   
   ```shell
   curl -XPUT 'http://127.0.0.1:9180/apisix/admin/routes/1' \
   --header 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' \
   --header 'Content-Type: application/json' \
   --data-raw '{
       "uri": "/transform",
       "plugins": {
           "serverless-pre-function":{
               "phase": "access",
               "functions": ["return function() local core = require(\"apisix.core\"); local body = core.request.get_body(); core.response.set_header(\"X-TEST\", \"TEXT\"); core.response.exit(200, string.upper(body)); end"]
           }
       }
   }'
   ```
   https://the-asf.slack.com/archives/CUC5MN17A/p1663553478727759?thread_ts=1663152493.333589&cid=CUC5MN17A
   
   ```shell
   curl http://127.0.0.1:9180/apisix/admin/routes/1  -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
   {
       "uri": "/test",
       "plugins": {
           "serverless-pre-function": {
               "phase": "rewrite",
               "functions" : ["return function() require(\"apisix.core\").ctx.register_var(\"lol\", function(ctx) return string.gsub(ngx.var.request_uri, \"?.*\", \"\"); end)
   ; end"]
           },
           "response-rewrite": {
               "headers": {
                   "set": {
                       "X-Lol": "$lol" <<<< using the variable
                   }
               }
           }
       },
       "upstream": {
           "type": "roundrobin",
           "nodes": {
               "127.0.0.1:1980": 1
           }
       }
   }'
   ```
   https://the-asf.slack.com/archives/CUC5MN17A/p1689745385755319?thread_ts=1689648232.277709&cid=CUC5MN17A


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