X-Accel-Redirect issues - Image of 0 size

Server NGINX
1

Hello,

I am trying to use the X-Accel-Redirect header feature of Dokuwiki.
However, when attempting to access images, for example, I receive an
image of zero size which the browsers displays as a URL. I believe my
nginx configuration is to blame.

Nginx config:

server {

    listen 80;

    server_name dev;

    root   /var/www/public_html/dev/public;
    index index.php;
    autoindex  on;

    location ~ \.php$ {
    include /usr/local/etc/nginx/fastcgi.conf;
    fastcgi_pass unix:/tmp/php-fpm.sock;
    fastcgi_index index.php;
    fastcgi_ignore_headers X-Accel-Redirect;
    fastcgi_pass_header X-Accel-Redirect;
    }

location ^~ /doku/data {
internal;
alias /wiki/data;
}

}

When I attempt to access
http://dev/doku/lib/exe/fetch.php?cache=&media=image.jpg (on filesystems
as /var/www/public_html/dev/public/doku/data/media/image.jpg) the
browser displays the following text with an image mimetype:

http://dev/doku/lib/exe/fetch.php?cache=&media=image.jpg

The headers received are:

Server: nginx
Date: Wed, 25 Aug 2010 06:06:42 GMT
Content-Type: image/jpeg
Expires: Thu, 26 Aug 2010 06:06:42 GMT
Cache-Control: public, proxy-revalidate, no-transform, max-age=86400
Pragma: public
Last-Modified: Mon, 23 Aug 2010 17:01:22 GMT
Content-Disposition: inline; filename=“image.jpg”;
X-Accel-Redirect:
/var/www/public_html/dev/public/doku/data/media/image.jpg

200 OK

In the access log the request is shown as:
“GET /doku/lib/exe/fetch.php?cache=&media=image.jpg HTTP/1.1” 499 0
“http://dev/doku/lib/exe/detail.php?id=start&media=image.jpg”
“GET /doku/lib/exe/fetch.php?cache=&media=image.jpg HTTP/1.1” 200 5
“http://dev/doku/lib/exe/detail.php?id=start&media=image.jpg”

I see the X-Accel-Redirect and correct mimetype headers are sent. Along
with the image not displaying, shouldn’t X-Accel-Redirect header read:

X-Accel-Redirect: /wiki/data/media/image.jpg

due to the alias directive?

What am I doing wrong?

Posted at Nginx Forum:

2

Hello!

On Wed, Aug 25, 2010 at 02:35:22AM -0400, habodal wrote:

    fastcgi_pass unix:/tmp/php-fpm.sock;
    fastcgi_index index.php;
    fastcgi_ignore_headers X-Accel-Redirect;
    fastcgi_pass_header X-Accel-Redirect;

Your fastcgi_ignore_headers and fastcgi_pass_header instruct nginx
to ignore X-Accel-Redirect header completely (i.e. do not handle
it) and pass it back to client. It’s probably not what you want.

Just remove these two directives.

Maxim D.

3

Hello!

On Wed, Aug 25, 2010 at 11:40:07AM -0400, habodal wrote:

host: “dev”, referrer:
"http://dev/doku/lib/exe/detail.php?id=start&media=image.jpg

The webroot, /var/www/public_html/dev/public/ appears twice in the
file’s path. How can I prevent this?

Looks like you return file path in X-Accel-Redirect. You should
return uri instead, i.e.

X-Accel-Redirect: /docu/data/media/image.jpg

Maxim D.

4

Thank you, I guess I misunderstood those directives’ functions.

After removing them, now I receive a 404 when attempting to access the
image. The error log shows:

[error] 1109#0: *40 open()
“/var/www/public_html/dev/public/var/www/public_html/dev/public/doku/data/media/image.jpg”
failed (2: No such file or directory), client: 192.168.1.121, server:
dev, request: “GET /doku/lib/exe/fetch.php?cache=&media=image.jpg
HTTP/1.1”, upstream: “fastcgi://unix:/usr/local/var/run/php-fpm.sock:”,
host: “dev”, referrer:
"http://dev/doku/lib/exe/detail.php?id=start&media=image.jpg

The webroot, /var/www/public_html/dev/public/ appears twice in the
file’s path. How can I prevent this?

Posted at Nginx Forum: