3.2.8, nginx, 500 errors (rewrite or internal redirection cycle)

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3.2.8, nginx, 500 errors (rewrite or internal redirection cycle)

Post by rrrkkk »

Hi, I have 3.2.8 installation on nginx server. I used the recommeneded nginx configuration, the most relevant parts for this issue (I think) are below:
location / {
index index.php index.html index.htm;
try_files $uri $uri/ @rewriteapp;

location @rewriteapp {
rewrite ^(.*)$ /app.php/$1 last;
I see some crawlers trying access the board and getting a 500 error code, like:
[error] ...#...: *... rewrite or internal redirection cycle while redirect to named location "@rewriteapp", client: ..., server: forum..., request: "GET /app.php/feed/topic/701 HTTP/1.1"
What can be seen in a debug log is, that first server tries to find file /app.php/feed/topic/701 (which does not exist). That is eventually passed to @rewriteapp, which spits out /app.php//app.php/feed/topic/701 (which does not exist). That is then passed to @rewriteapp again and the loop is formed. Then the nginx catches this and issues 500.

Essentially the same happens also with clients trying access an unexisting file, say for example /apple-touch-icon.png.

Now one possibility to break this loop gracefully might be adding =404 at the end of try_files, like:
try_files $uri $uri/ @rewriteapp =404;
but I have no idea if this would break something else? I ran some quick tests and nothing broke down but of course I do not know the phpBB software that well.

Any advice?

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