Hi,

1) Use mapped variable

map $http_<header you want to change> $<some variable name> {
"" "value if nit set";
default $http_<header you want to change>;
}
Then you can set header with the new variable.

2) I guess you can use map, too. Use $upstream_http_*name* instead.

3) Sorry, I have no idea on this.

On Sat, Aug 15, 2015, 00:51 Frank Liu <gfrankliu@gmail.com> wrote:

> Hi,
>
> I have a few questions regarding headers in nginx:
>
> 1) I use proxy_set_header to pass a header to upstream servers. Is it
> possible to honor the header if the incoming request already has it?
>
> 2) I want to pass the "Server" header from upstream response to clients,
> and if there is no such response header, I'd like to add a customer one. Is
> it possible via core nginx or any third party modules? Currently I am using
> "proxy_pass_header Server" without any check. I am not sure what happens if
> upstream response doesn't have it.
>
> 3) I am trying to log an upstream response header to access log but it has
> a "dot" in it (say X.header). I don't have any control to the upstream
> servers. On nginx side, I tried setting "ignore_invalid_headers off" in the
> server block, and in the logformat, I tried a few things for the the
> column: $upstream_http_x.header $upstream_http_x_header
> $upstream_http_x-header, but nothing works. Any ideas how I can log it?
>
> Thanks!
> Frank
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