Nginx重寫和proxy_pass解釋

Question

我可以在 nginx/okd 配置中看到以下位置：

    location /STFlow/ {
        rewrite ^/STFlow(.*)$ $1 last;
#   
#          Are four lines below executed if rewrite has last option ???
#          What's the point of them?          
#
        proxy_pass http://zuul-proxy:8080; 
        proxy_set_header Host      $host;
        proxy_set_header X-Real-IP $http_x_forwarded_for;
        proxy_set_header X-Forwarded-For $http_x_forwarded_for;
    }

    location / {
        add_header debug-header dbg5;   
        set $realip $remote_addr;
        if ($http_x_forwarded_for ~ "^(\d+\.\d+\.\d+\.\d+)") {
            set $realip $1;
        }
        proxy_pass http://zuul-proxy:8080; 
        proxy_set_header Host      $host;
        proxy_set_header X-Real-IP $http_x_forwarded_for;
        proxy_set_header X-Forwarded-For $http_x_forwarded_for;
        client_max_body_size 50M;
    }

在location /STFlow/下面有四行rewrite ^/STFlow(.*)$ $1 last; 曾經被處決過嗎？

如果是什么時候？

他們有什么意義？

Answer 1

如果該重寫規則有一個break標志而不是last ，它會在將/STFlow/some/path /STFlow前綴中刪除它，即除了location debug-header和$realip變量。 但據我了解，使用last標志會使四行永遠不會執行，進一步的 URI 處理將在第二個location塊內完成。