CODEWITHSUNDEEP
nginxreverse-proxy
sihill
sihill

Reputation: 41

Nginx proxy - return last-modified header from upstream

I have problem with Nginx acting as proxy serwer: request -> NGINX PROXY -> app server (only one)

Proxy server is listening on port 443 and an application server on 80. Headers returned by upstream server are being removed by proxy. I was forced to use:

add_header 'Content-Length' $upstream_http_content_length;

It works ok for Content-Length, however it doesn't work with Last-Modified header. Curl request from Nginx proxy using private IP to upstream returns all the headers. Why does the Nginx proxy cut this header out even if it's return is specified using add_header?

I have following nginx.conf sample:

location /some-web-app {
                    proxy_pass http://backend/some-web-app;
                    proxy_redirect off;
                    proxy_redirect http $scheme;
                    proxy_set_header Host $host;
                    add_header 'Last-Modified' $upstream_http_last_modified;
                    add_header 'Content-Length' $upstream_http_content_length;
                    sub_filter 'codebase="http' 'codebase="https';
                    sub_filter_types application/x-java-jnlp-file;
                    access_log /var/log/nginx/some-web-app_access.log combined_jsession_upstream;
                    error_log /var/log/nginx/some-web-app_err.log;
                    auth_basic            "Restricted";
                    auth_basic_user_file  /etc/nginx/htpasswd;
            }

Upvotes: 2

Views: 3228

Answers (1)

sihill
sihill

Reputation: 41

To forward returned last-modified header put following directive in location block:

sub_filter_last_modified on

To forward any other header use add_header with $upstream_http_${header}. Here I'll forward Content-Length header:

add_header 'Content-Length' $upstream_http_content_length;

Upvotes: 0

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