more_set_input_headers/more_clear_input_headers cannot set header "Host"

[LuoHaibin]

Build:

• NGINX: 1.14.2/1.16.1/1.18.0/1.19.1
• headers-more-nginx-module: 0.33

Config:

    server {
        listen       80;

        location / {
            proxy_pass http://192.168.0.103:81;
            more_set_input_headers 'Host: foo';
            more_set_input_headers 'o-Host: foo';
        }
    }

Request:

$ curl -svo /dev/null http://127.0.0.1
*   Trying 127.0.0.1:80...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 80 (#0)
> GET / HTTP/1.1
> Host: 127.0.0.1
> User-Agent: curl/7.68.0
> Accept: */*
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< Server: nginx/1.18.0
< Date: Sun, 19 Jul 2020 06:39:30 GMT
< Content-Type: text/html
< Content-Length: 612
< Connection: keep-alive
< Last-Modified: Tue, 21 Jan 2020 13:39:42 GMT
< ETag: "5e26ff1e-264"
< Accept-Ranges: bytes
<
{ [612 bytes data]
* Connection #0 to host 127.0.0.1 left intact

Proxied Server:

GET / HTTP/1.0
Host: 192.168.0.103:81
Connection: close
User-Agent: curl/7.68.0
Accept: */*
o-Host: foo

more_set_input_headers 'o-Host: foo'; worked, but more_set_input_headers 'Host: foo'; didn't

[ajs124]

I'm running into the exact same issue. Even the example for setting Host from the Readme doesn't seem to be working. How did you solve this in the end?