poorbarcode opened a new pull request, #23556:
URL: https://github.com/apache/pulsar/pull/23556

   ### Motivation
   
   If the user deploys a cluster with proxy, and network topology like this: 
Client -> Proxy(with TLS) -> Broker(without TLS)
   
   When the user calls `pulsar-admin topics lookup <topic name>`, the user will 
get a `null` response.
   
   But the exact value that the broker responded to is below:
   
   ```json
   {
        "brokerUrl": "pulsar://broker-1.com:6650",
        "httpUrl": "http://broker-1.com:8080";,
        "brokerUrlSsl": ""
   }
   ```
   
   It is caused by the pulsar-admin client's issue: 
https://github.com/apache/pulsar/blob/master/pulsar-client-admin/src/main/java/org/apache/pulsar/client/admin/internal/LookupImpl.java#L60
   
   ```java
   if (client.useTls) {
     return response.brokerUrlSsl; // even if it is null 
   }
   ```
   
   ### Modifications
   
   - fix the issue
   - the test is hard to write, so I skipped to write a test
   
   
   ### Documentation
   
   <!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
   
   - [ ] `doc` <!-- Your PR contains doc changes. -->
   - [ ] `doc-required` <!-- Your PR changes impact docs and you will update 
later -->
   - [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
   - [ ] `doc-complete` <!-- Docs have been already added -->
   
   ### Matching PR in forked repository
   
   PR in forked repository: x
   


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