The example explains the difference between ngx.var.uri and ngx.var.request_uri

example

• nginx configuration

    # 重写 uri，将 /abcxxx 重写为 /abc-xchenhao-xxx
    rewrite /abc(.*) /abc-xchenhao-$1 last;
    
    location /abc {
            # 输出 ngx.var.uri 和 ngx.var.request_uri 的值
            content_by_lua_block {
                 ngx.print('ngx.var.uri: ' .. ngx.var.uri .. "\nngx.var.request_uri: " .. ngx.var.request_uri)
            }
    }

• result

$ curl https://example.com/abcdef?foo=bar
ngx.var.uri: /abc-xchenhao-def
ngx.var.request_uri: /abcdef?foo=bar

the difference

• ngx.var.request_uri

The original request URI sent by the client, including parameters, cannot be modified, for example /abcdef?foo=bar

• ngx.var.uri

The URI of the current request, which can contain parameters and can be internally redirected or modified, for example /abc-xchenhao-def

reference

• http://t.zoukankan.com/chenpython123-p-10832393.html
• https://www.jianshu.com/p/384556e3938b