Redirect based on header value.

Nick Pearson nick.pearson at
Thu Nov 19 07:26:33 MSK 2009

Maybe something like this...
(config below assumes your header is "My-Header" and must have an
integer value to be recognized)

server {
    # ...

    set $path_prefix '';
    if ($http_my_header ~ (\d+)) {
        set $path_prefix /$1;

    location / {
        # proxy_set_header calls here
        proxy_pass s1_server$path_prefix;

I know "if" is evil, but I don't know that there's any other way to
accomplish a conditional like this.


On Wed, Nov 18, 2009 at 2:42 AM, zestriddle <nginx-forum at> wrote:
> Let assume that server called n1 is reverse proxy (SSL) for http server s1. Client c1 connects to n1 using given URL https://n1/index.html and in the end reads web page from /var/www/index.html on s1. What I want to do is to change URL sent to s1 depending on some header value sent by client. Namely, c1 connects to n1 with URL https://n1/index.html and with header "some_header=123" then n1 checks in some configuration file what to do if some_header has the value of 123 and changes the URL http://s1/123/index.html (as an example).  I did the same thing on Apache using *.map files and RewriteRule how I can do the same thing in nginx ?
> Posted at Nginx Forum:,23791,23791#msg-23791

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