vinson-zhang commented on issue #11205:
URL: https://github.com/apache/apisix/issues/11205#issuecomment-2778319238

   I think it's related to some built-in behavior of APISIX because, in 
reality, APISIX's request is not made according to the upstream configuration 
but based on the Host header. By default, when requesting 127.0.0.1:9080, it 
actually repeatedly accesses APISIX's local address, resulting in a loop and 
ultimately an error (also a 404). When the Host header is explicitly specified, 
it directly accesses the address corresponding to the Host, as shown in the 
screenshot below:
   
   
![Image](https://github.com/user-attachments/assets/92ac2a4c-15de-44a4-9b49-618a04f0afdd)


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