[GitHub] [apisix] mscb402 commented on issue #9494: Missing space before the appended originating IP with the `real-ip` plugin

["mscb402 (via GitHub)" <gi...@apache.org>]

mscb402 commented on issue #9494:
URL: https://github.com/apache/apisix/issues/9494#issuecomment-1551039427

   I believe this may be a bug with httpbin. Firstly, it seems that you are sending the wrong header - it should be `x-forwarded-for`, not `x_forwarded_for`. However, it appears that httpbin is still able to process the `x_forwarded_for` header for the sake of compatibility. It seems possible that there is a bug related to this compatibility feature. As a solution, you could try the following: 
   ```
   curl http://httpbin.org/anything -H "x-forwarded-for: 1.2.3.111" -v -H 'x_forwarded_for: 1.1.1.1'
   ```
   Send request without to APISIX. And you will get the same result below:
   ```
   *   Trying 54.173.69.67:80...
   * Connected to httpbin.org (54.173.69.67) port 80 (#0)
   > GET /anything HTTP/1.1
   > Host: httpbin.org
   > User-Agent: curl/7.74.0
   > Accept: */*
   > x-forwarded-for: 1.2.3.111
   > x_forwarded_for: 1.1.1.1
   >
   * Mark bundle as not supporting multiuse
   < HTTP/1.1 200 OK
   < Date: Wed, 17 May 2023 09:10:57 GMT
   < Content-Type: application/json
   < Content-Length: 361
   < Connection: keep-alive
   < Server: gunicorn/19.9.0
   < Access-Control-Allow-Origin: *
   < Access-Control-Allow-Credentials: true
   <
   {
     "args": {},
     "data": "",
     "files": {},
     "form": {},
     "headers": {
       "Accept": "*/*",
       "Host": "httpbin.org",
       "User-Agent": "curl/7.74.0",
       "X-Amzn-Trace-Id": "Root=1-64649a1f-23d29ac7700c8fc15eac7054"
     },
     "json": null,
     "method": "GET",
     "origin": "1.2.3.111, 61.232.56.241,1.1.1.1",
     "url": "http://httpbin.org/anything"
   }
   ```


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