Jinja2 fragment to define a reverse proxy

nginx_proxy_pass.j2

# Use like {{ proxy_pass('/admin', 'reljudge') }}
{%- macro proxy_pass(location, backend_name, host='', backend_proto='http', root=None, extra_conf=None) -%}
    location {{ location }} {
        {% if root != None %}
        root {{ root }};
        {% endif %}
        proxy_pass {{ backend_proto }}://{{ backend_name }}{{ location }};
        {% if backend_proto == 'https' %}
        proxy_ssl_session_reuse on;
        {% endif %}
        {% if host %}
        proxy_set_header Host {{ host }};
        {% else %}
        proxy_set_header Host $host;
        {% endif %}

        proxy_set_header Connection "Upgrade";
        proxy_http_version 1.1;

        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_hide_header "Via";
        proxy_hide_header "X-Cache";
        proxy_hide_header "X-Powered-By";

        {% if extra_conf != None %}
        # extra configuration:
        {{ extra_conf }}
        {% endif %}
    }
{%- endmacro -%}