Eugaia Wrote:
-------------------------------------------------------
> saltyflorida wrote:
> > I forgot to mention that I am using caching with
> the HTTP Proxy module and that I only want to
> cache responses from the production servers. When
> I have the cookie set to "testing" or "staging",
> I'd like to bypass the cache and talk directly to
> the backend. Does this sound feasible?
> >
> Sure. Do a rewrite using your $backend variable
> under the 'location /'
> block to one of three other blocks, which have the
> different definitions
> of your proxy_pass, proxy_cache_valid...
>
> e.g.
>
> map $cookie_ $backend {
>
> default production;
> test test;
> ...
> }
>
> location / {
> rewrite ^(.*)$ /$backend/$1;
> }
>
> location /production/ {
> proxy_pass
> http://backend_production;
> proxy_cache_valid ...
> }
>
> location /test/ {
> proxy_pass
> # no proxy_cache_valid
> ...
> }
>
> Note, you'll need some way to catch the case of no
> cookie variable, so
> it's unwise to put $cookie_ directly in the
> rewrite result (you'll
> get an infinite loop on such results).
>
> Marcus.
>
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Marcus,
Thank you for your help. I had wondered if I could use a rewrite, but I don't
understand how this works. I tried to implement your suggestion, but I am
being redirected to /testing/ or /production/. These show up as part of the
URL in the browser. Also, trying to visit pages other than the root return a
404 error. Here is my configuration. Can you point out what I'm doing wrong?

http {
upstream backend_testing {
ip_hash;
server ...
}
upstream backend_staging {
ip_hash;
server ...
}
upstream backend_production {
ip_hash;
server ...
}
proxy_cache_path /mnt/nginx_cache levels=1:2
keys_zone=one:100m
inactive=7d max_size=10g;
proxy_temp_path /var/www/nginx_temp;

map $cookie_uslnn_env $backend {
default http://backend_production;
testing http://backend_testing;
staging http://backend_staging;
production http://backend_production;
}

server {
location / {
rewrite ^(.*)$ /$backend/$1;
}
location /testing/ {
proxy_pass http://backend_testing;
}
location /staging/ {
proxy_pass http://backend_staging;
}
location /production/ {
proxy_pass http://backend_production;
proxy_cache one;
proxy_cache_key $my_cache_key;
proxy_cache_valid 200 302 304 10m;
proxy_cache_valid 301 1h;
proxy_cache_valid any 1m;
proxy_cache_use_stale updating error timeout invalid_header http_500 http_502 http_503 http_504;
}
location /wp-admin {
proxy_pass http://backend_production;
proxy_read_timeout 300;
}
}
}

Thanks,
Eliot