Change content-type with proxy_pass

General Discussion
,
1

Our object storage set Content-Type: application/octet-stream to images which leads browsers to download them. We need to let browsers preview them. So we use nginx like this:

location /os/ {
  proxy_pass http://os.company.com/;
  proxy_hide_header Content-Type;
}

It will remove Content-Type: application/octet-stream header. But how could we set the default content type such as image/png or image/jpg to the response?

1 Like
2

add_header perhaps?

3

add_header {according to the file name extension}, how to fill in the blank?

4

Perhaps using multiple location blocks? E.g.


location ~ .+\.png$ {
    ...
    add_header Content-Type image/png;
    # Or maybe this would also work
    # default_type image/png;
}

There may be a better way if you’d need a lot of these…

5

What if I’d like to support all the mime types which were supported by nginx by default?

6

So the question is really

“How to make nginx override the Content-Type header?”

7

Can do it with maps and you still need to fill out a map table for all the types you want to support, but…

http {
    ...
    map $uri $fix_content_type {
        default application/octet-stream;
        ~(.*.png)$ image/png;
        ~(.*.jpg)$ image/jpeg;
    }

    server {
        ...
        location /os/ {
            proxy_pass http://os.company.com/;
            proxy_hide_header Content-Type;
            add_header Content-Type $fix_content_type;
        }
    }
}
2 Likes
8

This would be a solution. Thank you.

Is there any way to use the content of the default mime type file?

1 Like
9

I don’t see an obvious way as the format is different.

You can include a file in the map, so you could write a script to convert the mime.types into the right format and include that…

1 Like
10

Thank you for answering the question. I’ll take the map way as the solution. But I suggest that it should be an obvious way to re-apply the default behavior. And thanks again for the great software.

1 Like
11

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