File Downloads with reverse proxy

[Callum Scott]

Hi All,

I am having difficulty forcing downloads of mp4 files with a ?download
query in the url.

I am proxying files from an s3 bucket like this

  location ~* ^/myvideo/content/(.*)  {
    set $bucket           'mys3buket.domain.com';
    set $aws_access       'my_aws_access_key';
    set $aws_secret       'my_aws_secret_key';
    set $url_full         "$1";
    set_by_lua $now       "return ngx.cookie_time(ngx.time())";
    set $string_to_sign
"$request_method\n\n\n\nx-amz-date:${now}\n/$bucket/$url_full";
    set_hmac_sha1          $aws_signature $aws_secret $string_to_sign;
    set_encode_base64      $aws_signature $aws_signature;

    resolver               172.31.0.2 valid=300s;
    resolver_timeout       10s;

    proxy_http_version     1.1;
    proxy_set_header       Host $bucket.s3.amazonaws.com;
    proxy_set_header       x-amz-date $now;
    proxy_set_header       Authorization "AWS $aws_access:$aws_signature";
    proxy_buffering        off;
    proxy_intercept_errors on;

    rewrite .* /$url_full break;

    more_set_headers 'Access-Control-Allow-Origin: $cors_header' 'Vary:
Origin';

    proxy_pass             http://s3.amazonaws.com;

  }


and have another location section like this


  location ~* (.*\.mp4\?download) {
    autoindex off;
    expires 365d;
    add_header Pragma public;
    add_header Cache-Control "public";

    if ($arg_dl = "1") {
        add_header Content-disposition "attachment; filename=$1";
    }
  }

The equivelent apache config that works is

# Add headers to force download if required
RewriteCond %{REQUEST_URI} \.mp4$
RewriteCond %{QUERY_STRING} ^download$
RewriteRule ^ "-" [E=dwn:1]

I was expecting the video to download in this case, however it is just
streamed instead as it would be without the ?download query.

Can somone please suggest where I am going wrong?

Regards

-- 
Callum
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