Technoboy- opened a new pull request #14876:
URL: https://github.com/apache/pulsar/pull/14876
### Motivation
When topic does not exist, the original logic will return
`TEMPORARY_REDIRECT`, it will cause the client below exception :
```
Caused by: java.lang.NullPointerException: originalUrl
at org.asynchttpclient.util.Assertions.assertNotNull(Assertions.java:23)
at org.asynchttpclient.uri.UriParser.parse(UriParser.java:344)
at org.asynchttpclient.uri.Uri.create(Uri.java:67)
at
org.asynchttpclient.netty.handler.intercept.Redirect30xInterceptor.exitAfterHandlingRedirect(Redirect30xInterceptor.java:128)
at
org.asynchttpclient.netty.handler.intercept.Interceptors.exitAfterIntercept(Interceptors.java:98)
at
org.asynchttpclient.netty.handler.HttpHandler.handleHttpResponse(HttpHandler.java:78)
at
org.asynchttpclient.netty.handler.HttpHandler.handleRead(HttpHandler.java:140)
```
### Modification
- Return `NOT_FOUND` instead of `TEMPORARY_REDIRECT`
### Documentation
- [x] `no-need-doc`
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