lizeming opened a new issue #2468:
URL: https://github.com/apache/apisix/issues/2468
### Issue description
Hello, we are APISIX users. Currently using APISIX unified Internet
proxy service. We have a requirement that we need to use the same Internet IP
address and different ports to differentiate services, and use a reverse proxy
to the back-end service. The back-end service will return the ‘Host’ address in
the request header as the host address of the URL to the client. However, we
found that the ‘Host’ requested by the client has a port, but APISIX will be
modified to an address without a port to the back-end service, causing the
back-end service to return an incorrect address and cause an access error.
Header rewriting via proxy_rewrite plug-in does not take effect. How do I solve
this situation? Is it reasonable for APISIX to remove the port from the ‘Host’
address?
### Environment
* apisix version (cmd: `apisix version`): 1.5
* OS: Redhat Linux 7.4 x64
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