I tried to create the following scenario:

1. Request test_page.php
2. lua exec to @checkpoint
3. @checkpoint does capture location to test_loc (future phpids)
4. test_loc/index.php returns either 200 or 403 status
5. @checkpoint continues or halts request accordingly

# GET /test_page.php
server {
listen 80;
server_name testsite.com;
root /home/user/testsite.com/public_html;
location @checkpoint {
access_by_lua '
local res = ngx.location.capture("/test_loc")

if res.status == ngx.HTTP_OK then
return
end

if res.status == ngx.HTTP_FORBIDDEN then
ngx.exit(res.status)
end

ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR)
';
}
location @proxy {
include /etc/nginx/firewall.default;

# Block IPs in Spamhaus drop list
if ($block = 1) {
return 444;
}

proxy_pass http://127.0.0.1:8080;
...
}
location /error_docs {
internal;
alias /home/user/$host/error_docs;
}
location /test_loc {
internal;
alias /usr/share/test_loc/;
rewrite_by_lua 'ngx.exec("@proxy");';
}
location / {
try_files $uri $uri/ @proxy;
}
location ~ .+\.php$ {
location ~ ^/test_page\.php$ {
rewrite_by_lua 'ngx.exec("@checkpoint");';
}

rewrite_by_lua 'ngx.exec("@proxy");';
}
}

Result is "the http output chain is empty while connecting to
upstream" blah blah blah and output is equivalent to issuing "return
444". http://pastebin.com/7WisVBDU

Logs seem to show "GET /test_page.php" being run a second time.

Any tips on fixing?

Cheers

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