Hi,
if I read the Module ngx_http_proxy_module documentation I will find e.g. an possible header rewrite in this way

proxy_set_header Host $host:$proxy_port;

but what would happens here if $host contains already a port number because the server does not listen on a default port. Maybe the server is listening on port 8080 but $proxy_port is 8081. Is the header then "Host: $hostname:8080:8081" or has nginx an automatic in this case that the port part is removed from $host if a port is separately specified? The same question for $proxy_host:<port number> and $proxy_host contains already a port number.
Unfortunately I don't find any information about variable handling in nginx :-(.

TIA,
SW

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