2017-01-24 1:07 GMT+03:00 Christopher Schultz <ch...@christopherschultz.net>:
>
> I've got an EC2 instance behind a load balancer where TLS is being
> terminated. I've arranged for two separate httpd (2.4.25)
> VirtualHosts: one for the secure connections (proxied from the lb) and
> another for the non-secure connections.
>
> I have a Redirect directive that isn't behaving as I'd like it to behave
> :
>
> RedirectMatch permanent ^/$    /site/
>
> I have the same redirect in both VirtualHosts. The redirect itself
> works, but it doesn't preserve the secure-protocol when I'm using the
> secure VirtualHost.
>
[....]
>
> I'm expecting httpd to redirect a request from
> "https://www.example.com/"; to "https://www.example.com/site/"; but
> instead I'm getting redirected to "http://www.example.com/site/";.
>
> Can anyone see anything wrong with my configuration? Or do I have a
> misunderstanding of how RedirectMatch will built its relative URLs?

If that VirtualHost is accessed only by your lb, you should look at
ServerName directive. It can include a scheme.

http://httpd.apache.org/docs/2.4/mod/core.html#servername
[quote]
Sometimes, the server runs behind a device that processes SSL, such as
a reverse proxy, load balancer or SSL offload appliance. When this is
the case, specify the https:// scheme and the port number to which the
clients connect in the ServerName directive to make sure that the
server generates the correct self-referential URLs.
[/quote]


(Source code:
mod_alias.c/int fixup_redir(request_rec *r)
http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/modules/mappers/mod_alias.c?view=markup#l679
-> calls ap_construct_url(), declared in include/http_core.h, implemented in
http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/server/core.c?revision=1772678&view=markup#l1194
-> calls ap_http_scheme(r), declared in include/httpd.h as
#define ap_http_scheme(r) ap_run_http_scheme(r)
-> It is a hook API, a method that can be implemented in a module.
http://marc.info/?t=131165065300001&r=1&w=2
-> Implementation:
http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/modules/http/http_core.c?revision=1757669&view=markup#l113
-> Calls
r->server->server_scheme
)

Best regards,
Konstantin Kolinko

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